Measurement of the photon polarization in Λb0 → Λγ decays

LHCb Collaboration

doi:10.1103/PhysRevD.105.L051104

Measurement of the photon polarization in Λb0 → Λγ decays

LHCb Collaboration

(Astro)-Particles Physics

Research output: Contribution to Journal › Article › Academic › peer-review

Abstract

The photon polarization in b→sγ transitions is measured for the first time in radiative b-baryon decays exploiting the unique spin structure of Λb0→Λγ decays. A data sample corresponding to an integrated luminosity of 6 fb-1 collected by the LHCb experiment in pp collisions at a center-of-mass energy of 13 TeV is used. The photon polarization is measured to be αγ=0.82-0.26-0.13+0.17+0.04, where the first uncertainty is statistical and the second systematic. This result is in agreement with the Standard Model prediction and previous measurements in b-meson decays. Charge-parity breaking effects are studied for the first time in this observable and found to be consistent with CP symmetry.

Original language	English
Article number	L051104
Pages (from-to)	1-11
Number of pages	11
Journal	Physical Review D
Volume	105
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevD.105.L051104
Publication status	Published - 1 Mar 2022

Bibliographical note

Funding Information:
We express our gratitude to our colleagues in the CERN accelerator departments for the excellent performance of the LHC. We thank the technical and administrative staff at the LHCb Institutes. We acknowledge support from CERN and from the national agencies: CAPES, CNPq, FAPERJ, and FINEP (Brazil); MOST and NSFC (China); CNRS/IN2P3 (France); BMBF, DFG and MPG (Germany); INFN (Italy); NWO (Netherlands); MNiSW and NCN (Poland); MEN/IFA (Romania); MSHE (Russia); MICINN (Spain); SNSF and SER (Switzerland); NASU (Ukraine); STFC (United Kingdom); DOE NP and NSF (USA). We acknowledge the computing resources that are provided by CERN, IN2P3 (France), KIT and DESY (Germany), INFN (Italy), SURF (Netherlands), PIC (Spain), GridPP (United Kingdom), RRCKI and Yandex LLC (Russia), CSCS (Switzerland), IFIN-HH (Romania), CBPF (Brazil), PL-GRID (Poland) and NERSC (USA). We are indebted to the communities behind the multiple open-source software packages on which we depend. Individual groups or members have received support from ARC and ARDC (Australia); AvH Foundation (Germany); EPLANET, Marie Skłodowska-Curie Actions and ERC (European Union); A*MIDEX, ANR, IPhU and Labex P2IO, and Région Auvergne-Rhône-Alpes (France); Key Research Program of Frontier Sciences of CAS, CAS PIFI, CAS CCEPP, Fundamental Research Funds for the Central Universities, and the Science and Technology Program of Guangzhou (China); RFBR, RSF, and Yandex LLC (Russia); GVA, XuntaGal and GENCAT (Spain); the Leverhulme Trust, the Royal Society and UKRI (United Kingdom).

Publisher Copyright:
© 2022 CERN.

Funding

We express our gratitude to our colleagues in the CERN accelerator departments for the excellent performance of the LHC. We thank the technical and administrative staff at the LHCb Institutes. We acknowledge support from CERN and from the national agencies: CAPES, CNPq, FAPERJ, and FINEP (Brazil); MOST and NSFC (China); CNRS/IN2P3 (France); BMBF, DFG and MPG (Germany); INFN (Italy); NWO (Netherlands); MNiSW and NCN (Poland); MEN/IFA (Romania); MSHE (Russia); MICINN (Spain); SNSF and SER (Switzerland); NASU (Ukraine); STFC (United Kingdom); DOE NP and NSF (USA). We acknowledge the computing resources that are provided by CERN, IN2P3 (France), KIT and DESY (Germany), INFN (Italy), SURF (Netherlands), PIC (Spain), GridPP (United Kingdom), RRCKI and Yandex LLC (Russia), CSCS (Switzerland), IFIN-HH (Romania), CBPF (Brazil), PL-GRID (Poland) and NERSC (USA). We are indebted to the communities behind the multiple open-source software packages on which we depend. Individual groups or members have received support from ARC and ARDC (Australia); AvH Foundation (Germany); EPLANET, Marie Skłodowska-Curie Actions and ERC (European Union); A*MIDEX, ANR, IPhU and Labex P2IO, and Région Auvergne-Rhône-Alpes (France); Key Research Program of Frontier Sciences of CAS, CAS PIFI, CAS CCEPP, Fundamental Research Funds for the Central Universities, and the Science and Technology Program of Guangzhou (China); RFBR, RSF, and Yandex LLC (Russia); GVA, XuntaGal and GENCAT (Spain); the Leverhulme Trust, the Royal Society and UKRI (United Kingdom).

Access to Document

10.1103/PhysRevD.105.L051104

Persistent URL (handle)

Persistent link

Cite this

@article{db38ab4265244670a9c1a19294d69adf,

title = "Measurement of the photon polarization in Λb0 → Λγ decays",

abstract = "The photon polarization in b→sγ transitions is measured for the first time in radiative b-baryon decays exploiting the unique spin structure of Λb0→Λγ decays. A data sample corresponding to an integrated luminosity of 6 fb-1 collected by the LHCb experiment in pp collisions at a center-of-mass energy of 13 TeV is used. The photon polarization is measured to be αγ=0.82-0.26-0.13+0.17+0.04, where the first uncertainty is statistical and the second systematic. This result is in agreement with the Standard Model prediction and previous measurements in b-meson decays. Charge-parity breaking effects are studied for the first time in this observable and found to be consistent with CP symmetry.",

author = "R. Aaij and Abdelmotteleb, {A. S.W.} and {Abell{\'a}n Beteta}, C. and F. Abudin{\'e}n and T. Ackernley and B. Adeva and M. Adinolfi and H. Afsharnia and C. Agapopoulou and Aidala, {C. A.} and S. Aiola and Z. Ajaltouni and S. Akar and J. Albrecht and F. Alessio and M. Alexander and {Alfonso Albero}, A. and Z. Aliouche and G. Alkhazov and {Alvarez Cartelle}, P. and S. Amato and Amey, {J. L.} and Y. Amhis and L. An and L. Anderlini and A. Andreianov and M. Andreotti and F. Archilli and A. Artamonov and M. Artuso and K. Arzymatov and E. Aslanides and M. Atzeni and B. Audurier and S. Bachmann and M. Bachmayer and Back, {J. J.} and {Baladron Rodriguez}, P. and V. Balagura and W. Baldini and {Baptista Leite}, J. and M. Barbetti and Barlow, {R. J.} and S. Barsuk and W. Barter and M. Bartolini and F. Baryshnikov and Basels, {J. M.} and S. Bashir and G. Bassi and B. Batsukh and A. Battig and A. Bay and A. Beck and M. Becker and F. Bedeschi and I. Bediaga and A. Beiter and V. Belavin and S. Belin and V. Bellee and K. Belous and I. Belov and I. Belyaev and G. Bencivenni and E. Ben-Haim and A. Berezhnoy and R. Bernet and D. Berninghoff and Bernstein, {H. C.} and C. Bertella and A. Bertolin and C. Betancourt and F. Betti and Ia Bezshyiko and S. Bhasin and J. Bhom and L. Bian and Bieker, {M. S.} and S. Bifani and P. Billoir and M. Birch and Bishop, {F. C.R.} and A. Bitadze and A. Bizzeti and M. Bj{\o}rn and Blago, {M. P.} and T. Blake and F. Blanc and S. Blusk and D. Bobulska and Boelhauve, {J. A.} and {Boente Garcia}, O. and T. Boettcher and A. Boldyrev and A. Bondar and N. Bondar and S. Borghi and M. Borisyak and M. Borsato and Borsuk, {J. T.} and Bouchiba, {S. A.} and Bowcock, {T. J.V.} and A. Boyer and C. Bozzi and Bradley, {M. J.} and S. Braun and {Brea Rodriguez}, A. and J. Brodzicka and {Brossa Gonzalo}, A. and D. Brundu and A. Buonaura and L. Buonincontri and Burke, {A. T.} and C. Burr and A. Bursche and A. Butkevich and Butter, {J. S.} and J. Buytaert and W. Byczynski and S. Cadeddu and H. Cai and R. Calabrese and L. Calefice and {Calero Diaz}, L. and S. Cali and R. Calladine and M. Calvi and {Calvo Gomez}, M. and {Camargo Magalhaes}, P. and P. Campana and {Campoverde Quezada}, {A. F.} and S. Capelli and L. Capriotti and A. Carbone and G. Carboni and R. Cardinale and A. Cardini and I. Carli and P. Carniti and L. Carus and {Carvalho Akiba}, K. and {Casais Vidal}, A. and G. Casse and M. Cattaneo and G. Cavallero and S. Celani and J. Cerasoli and D. Cervenkov and Chadwick, {A. J.} and Chapman, {M. G.} and M. Charles and Ph Charpentier and G. Chatzikonstantinidis and {Chavez Barajas}, {C. A.} and M. Chefdeville and C. Chen and S. Chen and A. Chernov and V. Chobanova and S. Cholak and M. Chrzaszcz and A. Chubykin and V. Chulikov and P. Ciambrone and Cicala, {M. F.} and {Cid Vidal}, X. and G. Ciezarek and Clarke, {P. E.L.} and M. Clemencic and Cliff, {H. V.} and J. Closier and Cobbledick, {J. L.} and V. Coco and Coelho, {J. A.B.} and J. Cogan and E. Cogneras and L. Cojocariu and P. Collins and T. Colombo and L. Congedo and A. Contu and N. Cooke and G. Coombs and I. Corredoira and G. Corti and {Costa Sobral}, {C. M.} and B. Couturier and Craik, {D. C.} and J. Crkovsk{\'a} and {Cruz Torres}, M. and R. Currie and {Da Silva}, {C. L.} and S. Dadabaev and L. Dai and E. Dall'occo and J. Dalseno and C. D'Ambrosio and A. Danilina and P. D'Argent and Davies, {J. E.} and A. Davis and {De Aguiar Francisco}, O. and {De Bruyn}, K. and {De Capua}, S. and {De Cian}, M. and {De Miranda}, {J. M.} and {De Paula}, L. and {De Serio}, M. and {De Simone}, D. and {De Simone}, P. and {De Vellis}, F. and {De Vries}, {J. A.} and Dean, {C. T.} and F. Debernardis and D. Decamp and V. Dedu and {Del Buono}, L. and B. Delaney and Dembinski, {H. P.} and A. Dendek and V. Denysenko and D. Derkach and O. Deschamps and F. Desse and F. Dettori and B. Dey and {Di Cicco}, A. and {Di Nezza}, P. and S. Didenko and {Dieste Maronas}, L. and H. Dijkstra and V. Dobishuk and C. Dong and Donohoe, {A. M.} and F. Dordei and {Dos Reis}, {A. C.} and L. Douglas and A. Dovbnya and Downes, {A. G.} and Dudek, {M. W.} and L. Dufour and V. Duk and P. Durante and Durham, {J. M.} and D. Dutta and A. Dziurda and A. Dzyuba and S. Easo and U. Egede and V. Egorychev and S. Eidelman and S. Eisenhardt and S. Ek-In and L. Eklund and S. Ely and A. Ene and E. Epple and S. Escher and J. Eschle and S. Esen and T. Evans and A. Falabella and J. Fan and Y. Fan and B. Fang and S. Farry and D. Fazzini and M. F{\'e}o and {Fernandez Prieto}, A. and Fernez, {A. D.} and F. Ferrari and {Ferreira Lopes}, L. and {Ferreira Rodrigues}, F. and {Ferreres Sole}, S. and M. Ferrillo and M. Ferro-Luzzi and S. Filippov and Fini, {R. A.} and M. Fiorini and M. Firlej and Fischer, {K. M.} and Fitzgerald, {D. S.} and C. Fitzpatrick and T. Fiutowski and A. Fkiaras and F. Fleuret and M. Fontana and F. Fontanelli and R. Forty and D. Foulds-Holt and {Franco Lima}, V. and {Franco Sevilla}, M. and M. Frank and E. Franzoso and G. Frau and C. Frei and Friday, {D. A.} and J. Fu and Q. Fuehring and E. Gabriel and G. Galati and {Gallas Torreira}, A. and D. Galli and S. Gambetta and Y. Gan and M. Gandelman and P. Gandini and Y. Gao and M. Garau and {Garcia Martin}, {L. M.} and {Garcia Moreno}, P. and {Garc{\'i}a Pardi{\~n}as}, J. and {Garcia Plana}, B. and {Garcia Rosales}, {F. A.} and L. Garrido and C. Gaspar and Geertsema, {R. E.} and D. Gerick and Gerken, {L. L.} and E. Gersabeck and M. Gersabeck and T. Gershon and D. Gerstel and L. Giambastiani and V. Gibson and Giemza, {H. K.} and Gilman, {A. L.} and M. Giovannetti and A. Giovent{\`u} and {Gironella Gironell}, P. and L. Giubega and C. Giugliano and K. Gizdov and Gkougkousis, {E. L.} and Gligorov, {V. V.} and C. G{\"o}bel and E. Golobardes and D. Golubkov and A. Golutvin and A. Gomes and {Gomez Fernandez}, S. and {Goncalves Abrantes}, F. and M. Goncerz and G. Gong and P. Gorbounov and Gorelov, {I. V.} and C. Gotti and E. Govorkova and Grabowski, {J. P.} and T. Grammatico and {Granado Cardoso}, {L. A.} and E. Graug{\'e}s and E. Graverini and G. Graziani and A. Grecu and Greeven, {L. M.} and Grieser, {N. A.} and L. Grillo and S. Gromov and {Gruberg Cazon}, {B. R.} and C. Gu and M. Guarise and M. Guittiere and G{\"u}nther, {P. A.} and E. Gushchin and A. Guth and Y. Guz and T. Gys and T. Hadavizadeh and G. Haefeli and C. Haen and J. Haimberger and T. Halewood-Leagas and Hamilton, {P. M.} and Hammerich, {J. P.} and Q. Han and X. Han and Hancock, {T. H.} and Hansen, {E. B.} and S. Hansmann-Menzemer and N. Harnew and T. Harrison and C. Hasse and M. Hatch and J. He and M. Hecker and K. Heijhoff and K. Heinicke and Hennequin, {A. M.} and K. Hennessy and L. Henry and J. Heuel and A. Hicheur and D. Hill and M. Hilton and Hollitt, {S. E.} and R. Hou and Y. Hou and J. Hu and J. Hu and W. Hu and X. Hu and W. Huang and X. Huang and W. Hulsbergen and Hunter, {R. J.} and M. Hushchyn and D. Hutchcroft and D. Hynds and P. Ibis and M. Idzik and D. Ilin and P. Ilten and A. Inglessi and A. Ishteev and K. Ivshin and R. Jacobsson and H. Jage and S. Jakobsen and E. Jans and Jashal, {B. K.} and A. Jawahery and V. Jevtic and F. Jiang and M. John and D. Johnson and Jones, {C. R.} and Jones, {T. P.} and B. Jost and N. Jurik and {Kalavan Kadavath}, {S. H.} and S. Kandybei and Y. Kang and M. Karacson and M. Karpov and F. Keizer and Keller, {D. M.} and M. Kenzie and T. Ketel and B. Khanji and A. Kharisova and S. Kholodenko and T. Kirn and Kirsebom, {V. S.} and O. Kitouni and S. Klaver and N. Kleijne and K. Klimaszewski and Kmiec, {M. R.} and S. Koliiev and A. Kondybayeva and A. Konoplyannikov and P. Kopciewicz and R. Kopecna and P. Koppenburg and M. Korolev and I. Kostiuk and O. Kot and S. Kotriakhova and P. Kravchenko and L. Kravchuk and Krawczyk, {R. D.} and M. Kreps and F. Kress and S. Kretzschmar and P. Krokovny and W. Krupa and W. Krzemien and M. Kucharczyk and V. Kudryavtsev and Kuindersma, {H. S.} and Kunde, {G. J.} and T. Kvaratskheliya and D. Lacarrere and G. Lafferty and A. Lai and A. Lampis and D. Lancierini and Lane, {J. J.} and R. Lane and G. Lanfranchi and C. Langenbruch and J. Langer and O. Lantwin and T. Latham and F. Lazzari and {Le Gac}, R. and Lee, {S. H.} and R. Lef{\`e}vre and A. Leflat and S. Legotin and O. Leroy and T. Lesiak and B. Leverington and H. Li and P. Li and S. Li and Y. Li and Z. Li and X. Liang and T. Lin and R. Lindner and V. Lisovskyi and R. Litvinov and G. Liu and H. Liu and Q. Liu and S. Liu and {Lobo Salvia}, A. and A. Loi and {Lomba Castro}, J. and I. Longstaff and Lopes, {J. H.} and {L{\'o}pez Soli{\~n}o}, S. and Lovell, {G. H.} and Y. Lu and C. Lucarelli and D. Lucchesi and S. Luchuk and {Lucio Martinez}, M. and V. Lukashenko and Y. Luo and A. Lupato and E. Luppi and O. Lupton and A. Lusiani and X. Lyu and L. Ma and R. Ma and S. MacColini and F. MacHefert and F. MacIuc and V. MacKo and P. MacKowiak and S. Maddrell-Mander and O. Madejczyk and {Madhan Mohan}, {L. R.} and O. Maev and A. Maevskiy and D. Maisuzenko and Majewski, {M. W.} and Malczewski, {J. J.} and S. Malde and B. Malecki and A. Malinin and T. Maltsev and H. Malygina and G. Manca and G. Mancinelli and D. Manuzzi and D. Marangotto and J. Maratas and Marchand, {J. F.} and U. Marconi and S. Mariani and {Marin Benito}, C. and M. Marinangeli and J. Marks and Marshall, {A. M.} and Marshall, {P. J.} and G. Martelli and G. Martellotti and L. Martinazzoli and M. Martinelli and {Martinez Santos}, D. and {Martinez Vidal}, F. and A. Massafferri and M. Materok and R. Matev and A. Mathad and V. Matiunin and C. Matteuzzi and Mattioli, {K. R.} and A. Mauri and E. Maurice and J. Mauricio and M. Mazurek and M. McCann and L. McConnell and McGrath, {T. H.} and McHugh, {N. T.} and A. McNab and R. McNulty and Mead, {J. V.} and B. Meadows and G. Meier and N. Meinert and D. Melnychuk and S. Meloni and M. Merk and A. Merli and {Meyer Garcia}, L. and M. Mikhasenko and Milanes, {D. A.} and E. Millard and M. Milovanovic and Minard, {M. N.} and A. Minotti and L. Minzoni and Mitchell, {S. E.} and B. Mitreska and Mitzel, {D. S.} and A. M{\"o}dden and Mohammed, {R. A.} and Moise, {R. D.} and S. Mokhnenko and T. Momb{\"a}cher and Monroy, {I. A.} and S. Monteil and M. Morandin and G. Morello and Morello, {M. J.} and J. Moron and Morris, {A. B.} and Morris, {A. G.} and R. Mountain and H. Mu and F. Muheim and M. Mulder and D. M{\"u}ller and K. M{\"u}ller and Murphy, {C. H.} and D. Murray and P. Muzzetto and P. Naik and T. Nakada and R. Nandakumar and T. Nanut and I. Nasteva and M. Needham and I. Neri and N. Neri and S. Neubert and N. Neufeld and R. Newcombe and Niel, {E. M.} and S. Nieswand and N. Nikitin and Nolte, {N. S.} and C. Normand and C. Nunez and A. Oblakowska-Mucha and V. Obraztsov and T. Oeser and O'Hanlon, {D. P.} and S. Okamura and R. Oldeman and F. Oliva and Olivares, {M. E.} and Onderwater, {C. J.G.} and O'Neil, {R. H.} and {Otalora Goicochea}, {J. M.} and T. Ovsiannikova and P. Owen and A. Oyanguren and Padeken, {K. O.} and B. Pagare and Pais, {P. R.} and T. Pajero and A. Palano and M. Palutan and Y. Pan and G. Panshin and A. Papanestis and M. Pappagallo and Pappalardo, {L. L.} and C. Pappenheimer and W. Parker and C. Parkes and B. Passalacqua and G. Passaleva and A. Pastore and M. Patel and C. Patrignani and Pawley, {C. J.} and A. Pearce and A. Pellegrino and {Pepe Altarelli}, M. and S. Perazzini and D. Pereima and {Pereiro Castro}, A. and P. Perret and M. Petric and K. Petridis and A. Petrolini and A. Petrov and S. Petrucci and M. Petruzzo and Pham, {T. T.H.} and A. Philippov and L. Pica and M. Piccini and B. Pietrzyk and G. Pietrzyk and M. Pili and D. Pinci and F. Pisani and M. Pizzichemi and {P. K}, Resmi and V. Placinta and J. Plews and {Plo Casasus}, M. and F. Polci and {Poli Lener}, M. and M. Poliakova and A. Poluektov and N. Polukhina and I. Polyakov and E. Polycarpo and S. Ponce and D. Popov and S. Popov and S. Poslavskii and K. Prasanth and L. Promberger and C. Prouve and V. Pugatch and V. Puill and H. Pullen and G. Punzi and H. Qi and W. Qian and J. Qin and N. Qin and R. Quagliani and B. Quintana and Raab, {N. V.} and {Rabadan Trejo}, {R. I.} and B. Rachwal and Rademacker, {J. H.} and M. Rama and {Ramos Pernas}, M. and Rangel, {M. S.} and F. Ratnikov and G. Raven and M. Reboud and F. Redi and F. Reiss and {Remon Alepuz}, C. and Z. Ren and V. Renaudin and R. Ribatti and S. Ricciardi and K. Rinnert and P. Robbe and G. Robertson and Rodrigues, {A. B.} and E. Rodrigues and {Rodriguez Lopez}, {J. A.} and {Rodriguez Rodriguez}, {E. R.R.} and A. Rollings and P. Roloff and V. Romanovskiy and {Romero Lamas}, M. and {Romero Vidal}, A. and Roth, {J. D.} and M. Rotondo and Rudolph, {M. S.} and T. Ruf and {Ruiz Fernandez}, {R. A.} and {Ruiz Vidal}, J. and A. Ryzhikov and J. Ryzka and {Saborido Silva}, {J. J.} and N. Sagidova and N. Sahoo and B. Saitta and M. Salomoni and {Sanchez Gras}, C. and R. Santacesaria and {Santamarina Rios}, C. and M. Santimaria and E. Santovetti and D. Saranin and G. Sarpis and M. Sarpis and A. Sarti and C. Satriano and A. Satta and M. Saur and D. Savrina and H. Sazak and {Scantlebury Smead}, {L. G.} and A. Scarabotto and S. Schael and S. Scherl and M. Schiller and H. Schindler and M. Schmelling and B. Schmidt and S. Schmitt and O. Schneider and A. Schopper and M. Schubiger and S. Schulte and Schune, {M. H.} and R. Schwemmer and B. Sciascia and S. Sellam and A. Semennikov and M. Soares and A. Sergi and N. Serra and L. Sestini and A. Seuthe and Y. Shang and Shangase, {D. M.} and M. Shapkin and I. Shchemerov and L. Shchutska and T. Shears and L. Shekhtman and Z. Shen and V. Shevchenko and Shields, {E. B.} and Y. Shimizu and E. Shmanin and Shupperd, {J. D.} and Siddi, {B. G.} and {Silva Coutinho}, R. and G. Simi and S. Simone and N. Skidmore and T. Skwarnicki and Slater, {M. W.} and I. Slazyk and Smallwood, {J. C.} and Smeaton, {J. G.} and A. Smetkina and E. Smith and M. Smith and A. Snoch and M. Soares and {Soares Lavra}, L. and Sokoloff, {M. D.} and Soler, {F. J.P.} and A. Solovev and I. Solovyev and {Souza De Almeida}, {F. L.} and {Souza De Paula}, B. and B. Spaan and {Spadaro Norella}, E. and P. Spradlin and F. Stagni and M. Stahl and S. Stahl and S. Stanislaus and O. Steinkamp and O. Stenyakin and H. Stevens and S. Stone and M. Straticiuc and D. Strekalina and F. Suljik and J. Sun and L. Sun and Y. Sun and P. Svihra and Swallow, {P. N.} and K. Swientek and A. Szabelski and T. Szumlak and M. Szymanski and S. Taneja and Tanner, {A. R.} and Tat, {M. D.} and A. Terentev and F. Teubert and E. Thomas and Thompson, {D. J.D.} and Thomson, {K. A.} and V. Tisserand and S. T'Jampens and M. Tobin and L. Tomassetti and X. Tong and {Torres MacHado}, D. and Tou, {D. Y.} and E. Trifonova and C. Trippl and G. Tuci and A. Tully and N. Tuning and A. Ukleja and Unverzagt, {D. J.} and E. Ursov and A. Usachov and A. Ustyuzhanin and U. Uwer and A. Vagner and V. Vagnoni and A. Valassi and G. Valenti and {Valls Canudas}, N. and {Van Beuzekom}, M. and {Van Dijk}, M. and {Van Hecke}, H. and {Van Herwijnen}, E. and {Van Hulse}, {C. B.} and {Van Veghel}, M. and {Vazquez Gomez}, R. and {Vazquez Regueiro}, P. and {V{\'a}zquez Sierra}, C. and S. Vecchi and Velthuis, {J. J.} and M. Veltri and A. Venkateswaran and M. Veronesi and M. Vesterinen and D. Vieira and {Vieites Diaz}, M. and H. Viemann and X. Vilasis-Cardona and {Vilella Figueras}, E. and A. Villa and P. Vincent and Volle, {F. C.} and {Vom Bruch}, D. and A. Vorobyev and V. Vorobyev and N. Voropaev and K. Vos and R. Waldi and J. Walsh and C. Wang and J. Wang and J. Wang and J. Wang and J. Wang and M. Wang and R. Wang and Y. Wang and Z. Wang and Z. Wang and Z. Wang and Ward, {J. A.} and Watson, {N. K.} and Weber, {S. G.} and D. Websdale and C. Weisser and Westhenry, {B. D.C.} and White, {D. J.} and M. Whitehead and Wiederhold, {A. R.} and D. Wiedner and G. Wilkinson and M. Wilkinson and I. Williams and M. Williams and Williams, {M. R.J.} and Wilson, {F. F.} and W. Wislicki and M. Witek and L. Witola and Wotton, {S. A.} and Wotton, {S. A.} and H. Wu and K. Wyllie and Z. Xiang and D. Xiao and Y. Xie and A. Xu and J. Xu and L. Xu and M. Xu and Q. Xu and Z. Xu and Z. Xu and D. Yang and S. Yang and Y. Yang and Z. Yang and Z. Yang and Y. Yao and Yeomans, {L. E.} and H. Yin and J. Yu and X. Yuan and O. Yushchenko and E. Zaffaroni and M. Zavertyaev and M. Zdybal and O. Zenaiev and M. Zeng and D. Zhang and L. Zhang and S. Zhang and S. Zhang and Y. Zhang and Y. Zhang and A. Zharkova and A. Zhelezov and Y. Zheng and T. Zhou and X. Zhou and Y. Zhou and V. Zhovkovska and X. Zhu and X. Zhu and Z. Zhu and V. Zhukov and Zonneveld, {J. B.} and Q. Zou and S. Zucchelli and D. Zuliani and G. Zunica and {LHCb Collaboration}",

note = "Funding Information: We express our gratitude to our colleagues in the CERN accelerator departments for the excellent performance of the LHC. We thank the technical and administrative staff at the LHCb Institutes. We acknowledge support from CERN and from the national agencies: CAPES, CNPq, FAPERJ, and FINEP (Brazil); MOST and NSFC (China); CNRS/IN2P3 (France); BMBF, DFG and MPG (Germany); INFN (Italy); NWO (Netherlands); MNiSW and NCN (Poland); MEN/IFA (Romania); MSHE (Russia); MICINN (Spain); SNSF and SER (Switzerland); NASU (Ukraine); STFC (United Kingdom); DOE NP and NSF (USA). We acknowledge the computing resources that are provided by CERN, IN2P3 (France), KIT and DESY (Germany), INFN (Italy), SURF (Netherlands), PIC (Spain), GridPP (United Kingdom), RRCKI and Yandex LLC (Russia), CSCS (Switzerland), IFIN-HH (Romania), CBPF (Brazil), PL-GRID (Poland) and NERSC (USA). We are indebted to the communities behind the multiple open-source software packages on which we depend. Individual groups or members have received support from ARC and ARDC (Australia); AvH Foundation (Germany); EPLANET, Marie Sk{\l}odowska-Curie Actions and ERC (European Union); A*MIDEX, ANR, IPhU and Labex P2IO, and R{\'e}gion Auvergne-Rh{\^o}ne-Alpes (France); Key Research Program of Frontier Sciences of CAS, CAS PIFI, CAS CCEPP, Fundamental Research Funds for the Central Universities, and the Science and Technology Program of Guangzhou (China); RFBR, RSF, and Yandex LLC (Russia); GVA, XuntaGal and GENCAT (Spain); the Leverhulme Trust, the Royal Society and UKRI (United Kingdom). Publisher Copyright: {\textcopyright} 2022 CERN.",

year = "2022",

month = mar,

day = "1",

doi = "10.1103/PhysRevD.105.L051104",

language = "English",

volume = "105",

pages = "1--11",

journal = "Physical Review D",

issn = "2470-0010",

publisher = "American Physical Society",

number = "5",

}

TY - JOUR

T1 - Measurement of the photon polarization in Λb0 → Λγ decays

AU - Aaij, R.

AU - Abdelmotteleb, A. S.W.

AU - Abellán Beteta, C.

AU - Abudinén, F.

AU - Ackernley, T.

AU - Adeva, B.

AU - Adinolfi, M.

AU - Afsharnia, H.

AU - Agapopoulou, C.

AU - Aidala, C. A.

AU - Aiola, S.

AU - Ajaltouni, Z.

AU - Akar, S.

AU - Albrecht, J.

AU - Alessio, F.

AU - Alexander, M.

AU - Alfonso Albero, A.

AU - Aliouche, Z.

AU - Alkhazov, G.

AU - Alvarez Cartelle, P.

AU - Amato, S.

AU - Amey, J. L.

AU - Amhis, Y.

AU - An, L.

AU - Anderlini, L.

AU - Andreianov, A.

AU - Andreotti, M.

AU - Archilli, F.

AU - Artamonov, A.

AU - Artuso, M.

AU - Arzymatov, K.

AU - Aslanides, E.

AU - Atzeni, M.

AU - Audurier, B.

AU - Bachmann, S.

AU - Bachmayer, M.

AU - Back, J. J.

AU - Baladron Rodriguez, P.

AU - Balagura, V.

AU - Baldini, W.

AU - Baptista Leite, J.

AU - Barbetti, M.

AU - Barlow, R. J.

AU - Barsuk, S.

AU - Barter, W.

AU - Bartolini, M.

AU - Baryshnikov, F.

AU - Basels, J. M.

AU - Bashir, S.

AU - Bassi, G.

AU - Batsukh, B.

AU - Battig, A.

AU - Bay, A.

AU - Beck, A.

AU - Becker, M.

AU - Bedeschi, F.

AU - Bediaga, I.

AU - Beiter, A.

AU - Belavin, V.

AU - Belin, S.

AU - Bellee, V.

AU - Belous, K.

AU - Belov, I.

AU - Belyaev, I.

AU - Bencivenni, G.

AU - Ben-Haim, E.

AU - Berezhnoy, A.

AU - Bernet, R.

AU - Berninghoff, D.

AU - Bernstein, H. C.

AU - Bertella, C.

AU - Bertolin, A.

AU - Betancourt, C.

AU - Betti, F.

AU - Bezshyiko, Ia

AU - Bhasin, S.

AU - Bhom, J.

AU - Bian, L.

AU - Bieker, M. S.

AU - Bifani, S.

AU - Billoir, P.

AU - Birch, M.

AU - Bishop, F. C.R.

AU - Bitadze, A.

AU - Bizzeti, A.

AU - Bjørn, M.

AU - Blago, M. P.

AU - Blake, T.

AU - Blanc, F.

AU - Blusk, S.

AU - Bobulska, D.

AU - Boelhauve, J. A.

AU - Boente Garcia, O.

AU - Boettcher, T.

AU - Boldyrev, A.

AU - Bondar, A.

AU - Bondar, N.

AU - Borghi, S.

AU - Borisyak, M.

AU - Borsato, M.

AU - Borsuk, J. T.

AU - Bouchiba, S. A.

AU - Bowcock, T. J.V.

AU - Boyer, A.

AU - Bozzi, C.

AU - Bradley, M. J.

AU - Braun, S.

AU - Brea Rodriguez, A.

AU - Brodzicka, J.

AU - Brossa Gonzalo, A.

AU - Brundu, D.

AU - Buonaura, A.

AU - Buonincontri, L.

AU - Burke, A. T.

AU - Burr, C.

AU - Bursche, A.

AU - Butkevich, A.

AU - Butter, J. S.

AU - Buytaert, J.

AU - Byczynski, W.

AU - Cadeddu, S.

AU - Cai, H.

AU - Calabrese, R.

AU - Calefice, L.

AU - Calero Diaz, L.

AU - Cali, S.

AU - Calladine, R.

AU - Calvi, M.

AU - Calvo Gomez, M.

AU - Camargo Magalhaes, P.

AU - Campana, P.

AU - Campoverde Quezada, A. F.

AU - Capelli, S.

AU - Capriotti, L.

AU - Carbone, A.

AU - Carboni, G.

AU - Cardinale, R.

AU - Cardini, A.

AU - Carli, I.

AU - Carniti, P.

AU - Carus, L.

AU - Carvalho Akiba, K.

AU - Casais Vidal, A.

AU - Casse, G.

AU - Cattaneo, M.

AU - Cavallero, G.

AU - Celani, S.

AU - Cerasoli, J.

AU - Cervenkov, D.

AU - Chadwick, A. J.

AU - Chapman, M. G.

AU - Charles, M.

AU - Charpentier, Ph

AU - Chatzikonstantinidis, G.

AU - Chavez Barajas, C. A.

AU - Chefdeville, M.

AU - Chen, C.

AU - Chen, S.

AU - Chernov, A.

AU - Chobanova, V.

AU - Cholak, S.

AU - Chrzaszcz, M.

AU - Chubykin, A.

AU - Chulikov, V.

AU - Ciambrone, P.

AU - Cicala, M. F.

AU - Cid Vidal, X.

AU - Ciezarek, G.

AU - Clarke, P. E.L.

AU - Clemencic, M.

AU - Cliff, H. V.

AU - Closier, J.

AU - Cobbledick, J. L.

AU - Coco, V.

AU - Coelho, J. A.B.

AU - Cogan, J.

AU - Cogneras, E.

AU - Cojocariu, L.

AU - Collins, P.

AU - Colombo, T.

AU - Congedo, L.

AU - Contu, A.

AU - Cooke, N.

AU - Coombs, G.

AU - Corredoira, I.

AU - Corti, G.

AU - Costa Sobral, C. M.

AU - Couturier, B.

AU - Craik, D. C.

AU - Crkovská, J.

AU - Cruz Torres, M.

AU - Currie, R.

AU - Da Silva, C. L.

AU - Dadabaev, S.

AU - Dai, L.

AU - Dall'occo, E.

AU - Dalseno, J.

AU - D'Ambrosio, C.

AU - Danilina, A.

AU - D'Argent, P.

AU - Davies, J. E.

AU - Davis, A.

AU - De Aguiar Francisco, O.

AU - De Bruyn, K.

AU - De Capua, S.

AU - De Cian, M.

AU - De Miranda, J. M.

AU - De Paula, L.

AU - De Serio, M.

AU - De Simone, D.

AU - De Simone, P.

AU - De Vellis, F.

AU - De Vries, J. A.

AU - Dean, C. T.

AU - Debernardis, F.

AU - Decamp, D.

AU - Dedu, V.

AU - Del Buono, L.

AU - Delaney, B.

AU - Dembinski, H. P.

AU - Dendek, A.

AU - Denysenko, V.

AU - Derkach, D.

AU - Deschamps, O.

AU - Desse, F.

AU - Dettori, F.

AU - Dey, B.

AU - Di Cicco, A.

AU - Di Nezza, P.

AU - Didenko, S.

AU - Dieste Maronas, L.

AU - Dijkstra, H.

AU - Dobishuk, V.

AU - Dong, C.

AU - Donohoe, A. M.

AU - Dordei, F.

AU - Dos Reis, A. C.

AU - Douglas, L.

AU - Dovbnya, A.

AU - Downes, A. G.

AU - Dudek, M. W.

AU - Dufour, L.

AU - Duk, V.

AU - Durante, P.

AU - Durham, J. M.

AU - Dutta, D.

AU - Dziurda, A.

AU - Dzyuba, A.

AU - Easo, S.

AU - Egede, U.

AU - Egorychev, V.

AU - Eidelman, S.

AU - Eisenhardt, S.

AU - Ek-In, S.

AU - Eklund, L.

AU - Ely, S.

AU - Ene, A.

AU - Epple, E.

AU - Escher, S.

AU - Eschle, J.

AU - Esen, S.

AU - Evans, T.

AU - Falabella, A.

AU - Fan, J.

AU - Fan, Y.

AU - Fang, B.

AU - Farry, S.

AU - Fazzini, D.

AU - Féo, M.

AU - Fernandez Prieto, A.

AU - Fernez, A. D.

AU - Ferrari, F.

AU - Ferreira Lopes, L.

AU - Ferreira Rodrigues, F.

AU - Ferreres Sole, S.

AU - Ferrillo, M.

AU - Ferro-Luzzi, M.

AU - Filippov, S.

AU - Fini, R. A.

AU - Fiorini, M.

AU - Firlej, M.

AU - Fischer, K. M.

AU - Fitzgerald, D. S.

AU - Fitzpatrick, C.

AU - Fiutowski, T.

AU - Fkiaras, A.

AU - Fleuret, F.

AU - Fontana, M.

AU - Fontanelli, F.

AU - Forty, R.

AU - Foulds-Holt, D.

AU - Franco Lima, V.

AU - Franco Sevilla, M.

AU - Frank, M.

AU - Franzoso, E.

AU - Frau, G.

AU - Frei, C.

AU - Friday, D. A.

AU - Fu, J.

AU - Fuehring, Q.

AU - Gabriel, E.

AU - Galati, G.

AU - Gallas Torreira, A.

AU - Galli, D.

AU - Gambetta, S.

AU - Gan, Y.

AU - Gandelman, M.

AU - Gandini, P.

AU - Gao, Y.

AU - Garau, M.

AU - Garcia Martin, L. M.

AU - Garcia Moreno, P.

AU - García Pardiñas, J.

AU - Garcia Plana, B.

AU - Garcia Rosales, F. A.

AU - Garrido, L.

AU - Gaspar, C.

AU - Geertsema, R. E.

AU - Gerick, D.

AU - Gerken, L. L.

AU - Gersabeck, E.

AU - Gersabeck, M.

AU - Gershon, T.

AU - Gerstel, D.

AU - Giambastiani, L.

AU - Gibson, V.

AU - Giemza, H. K.

AU - Gilman, A. L.

AU - Giovannetti, M.

AU - Gioventù, A.

AU - Gironella Gironell, P.

AU - Giubega, L.

AU - Giugliano, C.

AU - Gizdov, K.

AU - Gkougkousis, E. L.

AU - Gligorov, V. V.

AU - Göbel, C.

AU - Golobardes, E.

AU - Golubkov, D.

AU - Golutvin, A.

AU - Gomes, A.

AU - Gomez Fernandez, S.

AU - Goncalves Abrantes, F.

AU - Goncerz, M.

AU - Gong, G.

AU - Gorbounov, P.

AU - Gorelov, I. V.

AU - Gotti, C.

AU - Govorkova, E.

AU - Grabowski, J. P.

AU - Grammatico, T.

AU - Granado Cardoso, L. A.

AU - Graugés, E.

AU - Graverini, E.

AU - Graziani, G.

AU - Grecu, A.

AU - Greeven, L. M.

AU - Grieser, N. A.

AU - Grillo, L.

AU - Gromov, S.

AU - Gruberg Cazon, B. R.

AU - Gu, C.

AU - Guarise, M.

AU - Guittiere, M.

AU - Günther, P. A.

AU - Gushchin, E.

AU - Guth, A.

AU - Guz, Y.

AU - Gys, T.

AU - Hadavizadeh, T.

AU - Haefeli, G.

AU - Haen, C.

AU - Haimberger, J.

AU - Halewood-Leagas, T.

AU - Hamilton, P. M.

AU - Hammerich, J. P.

AU - Han, Q.

AU - Han, X.

AU - Hancock, T. H.

AU - Hansen, E. B.

AU - Hansmann-Menzemer, S.

AU - Harnew, N.

AU - Harrison, T.

AU - Hasse, C.

AU - Hatch, M.

AU - He, J.

AU - Hecker, M.

AU - Heijhoff, K.

AU - Heinicke, K.

AU - Hennequin, A. M.

AU - Hennessy, K.

AU - Henry, L.

AU - Heuel, J.

AU - Hicheur, A.

AU - Hill, D.

AU - Hilton, M.

AU - Hollitt, S. E.

AU - Hou, R.

AU - Hou, Y.

AU - Hu, J.

AU - Hu, W.

AU - Hu, X.

AU - Huang, W.

AU - Huang, X.

AU - Hulsbergen, W.

AU - Hunter, R. J.

AU - Hushchyn, M.

AU - Hutchcroft, D.

AU - Hynds, D.

AU - Ibis, P.

AU - Idzik, M.

AU - Ilin, D.

AU - Ilten, P.

AU - Inglessi, A.

AU - Ishteev, A.

AU - Ivshin, K.

AU - Jacobsson, R.

AU - Jage, H.

AU - Jakobsen, S.

AU - Jans, E.

AU - Jashal, B. K.

AU - Jawahery, A.

AU - Jevtic, V.

AU - Jiang, F.

AU - John, M.

AU - Johnson, D.

AU - Jones, C. R.

AU - Jones, T. P.

AU - Jost, B.

AU - Jurik, N.

AU - Kalavan Kadavath, S. H.

AU - Kandybei, S.

AU - Kang, Y.

AU - Karacson, M.

AU - Karpov, M.

AU - Keizer, F.

AU - Keller, D. M.

AU - Kenzie, M.

AU - Ketel, T.

AU - Khanji, B.

AU - Kharisova, A.

AU - Kholodenko, S.

AU - Kirn, T.

AU - Kirsebom, V. S.

AU - Kitouni, O.

AU - Klaver, S.

AU - Kleijne, N.

AU - Klimaszewski, K.

AU - Kmiec, M. R.

AU - Koliiev, S.

AU - Kondybayeva, A.

AU - Konoplyannikov, A.

AU - Kopciewicz, P.

AU - Kopecna, R.

AU - Koppenburg, P.

AU - Korolev, M.

AU - Kostiuk, I.

AU - Kot, O.

AU - Kotriakhova, S.

AU - Kravchenko, P.

AU - Kravchuk, L.

AU - Krawczyk, R. D.

AU - Kreps, M.

AU - Kress, F.

AU - Kretzschmar, S.

AU - Krokovny, P.

AU - Krupa, W.

AU - Krzemien, W.

AU - Kucharczyk, M.

AU - Kudryavtsev, V.

AU - Kuindersma, H. S.

AU - Kunde, G. J.

AU - Kvaratskheliya, T.

AU - Lacarrere, D.

AU - Lafferty, G.

AU - Lai, A.

AU - Lampis, A.

AU - Lancierini, D.

AU - Lane, J. J.

AU - Lane, R.

AU - Lanfranchi, G.

AU - Langenbruch, C.

AU - Langer, J.

AU - Lantwin, O.

AU - Latham, T.

AU - Lazzari, F.

AU - Le Gac, R.

AU - Lee, S. H.

AU - Lefèvre, R.

AU - Leflat, A.

AU - Legotin, S.

AU - Leroy, O.

AU - Lesiak, T.

AU - Leverington, B.

AU - Li, H.

AU - Li, P.

AU - Li, S.

AU - Li, Y.

AU - Li, Z.

AU - Liang, X.

AU - Lin, T.

AU - Lindner, R.

AU - Lisovskyi, V.

AU - Litvinov, R.

AU - Liu, G.

AU - Liu, H.

AU - Liu, Q.

AU - Liu, S.

AU - Lobo Salvia, A.

AU - Loi, A.

AU - Lomba Castro, J.

AU - Longstaff, I.

AU - Lopes, J. H.

AU - López Soliño, S.

AU - Lovell, G. H.

AU - Lu, Y.

AU - Lucarelli, C.

AU - Lucchesi, D.

AU - Luchuk, S.

AU - Lucio Martinez, M.

AU - Lukashenko, V.

AU - Luo, Y.

AU - Lupato, A.

AU - Luppi, E.

AU - Lupton, O.

AU - Lusiani, A.

AU - Lyu, X.

AU - Ma, L.

AU - Ma, R.

AU - MacColini, S.

AU - MacHefert, F.

AU - MacIuc, F.

AU - MacKo, V.

AU - MacKowiak, P.

AU - Maddrell-Mander, S.

AU - Madejczyk, O.

AU - Madhan Mohan, L. R.

AU - Maev, O.

AU - Maevskiy, A.

AU - Maisuzenko, D.

AU - Majewski, M. W.

AU - Malczewski, J. J.

AU - Malde, S.

AU - Malecki, B.

AU - Malinin, A.

AU - Maltsev, T.

AU - Malygina, H.

AU - Manca, G.

AU - Mancinelli, G.

AU - Manuzzi, D.

AU - Marangotto, D.

AU - Maratas, J.

AU - Marchand, J. F.

AU - Marconi, U.

AU - Mariani, S.

AU - Marin Benito, C.

AU - Marinangeli, M.

AU - Marks, J.

AU - Marshall, A. M.

AU - Marshall, P. J.

AU - Martelli, G.

AU - Martellotti, G.

AU - Martinazzoli, L.

AU - Martinelli, M.

AU - Martinez Santos, D.

AU - Martinez Vidal, F.

AU - Massafferri, A.

AU - Materok, M.

AU - Matev, R.

AU - Mathad, A.

AU - Matiunin, V.

AU - Matteuzzi, C.

AU - Mattioli, K. R.

AU - Mauri, A.

AU - Maurice, E.

AU - Mauricio, J.

AU - Mazurek, M.

AU - McCann, M.

AU - McConnell, L.

AU - McGrath, T. H.

AU - McHugh, N. T.

AU - McNab, A.

AU - McNulty, R.

AU - Mead, J. V.

AU - Meadows, B.

AU - Meier, G.

AU - Meinert, N.

AU - Melnychuk, D.

AU - Meloni, S.

AU - Merk, M.

AU - Merli, A.

AU - Meyer Garcia, L.

AU - Mikhasenko, M.

AU - Milanes, D. A.

AU - Millard, E.

AU - Milovanovic, M.

AU - Minard, M. N.

AU - Minotti, A.

AU - Minzoni, L.

AU - Mitchell, S. E.

AU - Mitreska, B.

AU - Mitzel, D. S.

AU - Mödden, A.

AU - Mohammed, R. A.

AU - Moise, R. D.

AU - Mokhnenko, S.

AU - Mombächer, T.

AU - Monroy, I. A.

AU - Monteil, S.

AU - Morandin, M.

AU - Morello, G.

AU - Morello, M. J.

AU - Moron, J.

AU - Morris, A. B.

AU - Morris, A. G.

AU - Mountain, R.

AU - Mu, H.

AU - Muheim, F.

AU - Mulder, M.

AU - Müller, D.

AU - Müller, K.

AU - Murphy, C. H.

AU - Murray, D.

AU - Muzzetto, P.

AU - Naik, P.

AU - Nakada, T.

AU - Nandakumar, R.

AU - Nanut, T.

AU - Nasteva, I.

AU - Needham, M.

AU - Neri, I.

AU - Neri, N.

AU - Neubert, S.

AU - Neufeld, N.

AU - Newcombe, R.

AU - Niel, E. M.

AU - Nieswand, S.

AU - Nikitin, N.

AU - Nolte, N. S.

AU - Normand, C.

AU - Nunez, C.

AU - Oblakowska-Mucha, A.

AU - Obraztsov, V.

AU - Oeser, T.

AU - O'Hanlon, D. P.

AU - Okamura, S.

AU - Oldeman, R.

AU - Oliva, F.

AU - Olivares, M. E.

AU - Onderwater, C. J.G.

AU - O'Neil, R. H.

AU - Otalora Goicochea, J. M.

AU - Ovsiannikova, T.

AU - Owen, P.

AU - Oyanguren, A.

AU - Padeken, K. O.

AU - Pagare, B.

AU - Pais, P. R.

AU - Pajero, T.

AU - Palano, A.

AU - Palutan, M.

AU - Pan, Y.

AU - Panshin, G.

AU - Papanestis, A.

AU - Pappagallo, M.

AU - Pappalardo, L. L.

AU - Pappenheimer, C.

AU - Parker, W.

AU - Parkes, C.

AU - Passalacqua, B.

AU - Passaleva, G.

AU - Pastore, A.

AU - Patel, M.

AU - Patrignani, C.

AU - Pawley, C. J.

AU - Pearce, A.

AU - Pellegrino, A.

AU - Pepe Altarelli, M.

AU - Perazzini, S.

AU - Pereima, D.

AU - Pereiro Castro, A.

AU - Perret, P.

AU - Petric, M.

AU - Petridis, K.

AU - Petrolini, A.

AU - Petrov, A.

AU - Petrucci, S.

AU - Petruzzo, M.

AU - Pham, T. T.H.

AU - Philippov, A.

AU - Pica, L.

AU - Piccini, M.

AU - Pietrzyk, B.

AU - Pietrzyk, G.

AU - Pili, M.

AU - Pinci, D.

AU - Pisani, F.

AU - Pizzichemi, M.

AU - P. K, Resmi

AU - Placinta, V.

AU - Plews, J.

AU - Plo Casasus, M.

AU - Polci, F.

AU - Poli Lener, M.

AU - Poliakova, M.

AU - Poluektov, A.

AU - Polukhina, N.

AU - Polyakov, I.

AU - Polycarpo, E.

AU - Ponce, S.

AU - Popov, D.

AU - Popov, S.

AU - Poslavskii, S.

AU - Prasanth, K.

AU - Promberger, L.

AU - Prouve, C.

AU - Pugatch, V.

AU - Puill, V.

AU - Pullen, H.

AU - Punzi, G.

AU - Qi, H.

AU - Qian, W.

AU - Qin, J.

AU - Qin, N.

AU - Quagliani, R.

AU - Quintana, B.

AU - Raab, N. V.

AU - Rabadan Trejo, R. I.

AU - Rachwal, B.

AU - Rademacker, J. H.

AU - Rama, M.

AU - Ramos Pernas, M.

AU - Rangel, M. S.

AU - Ratnikov, F.

AU - Raven, G.

AU - Reboud, M.

AU - Redi, F.

AU - Reiss, F.

AU - Remon Alepuz, C.

AU - Ren, Z.

AU - Renaudin, V.

AU - Ribatti, R.

AU - Ricciardi, S.

AU - Rinnert, K.

AU - Robbe, P.

AU - Robertson, G.

AU - Rodrigues, A. B.

AU - Rodrigues, E.

AU - Rodriguez Lopez, J. A.

AU - Rodriguez Rodriguez, E. R.R.

AU - Rollings, A.

AU - Roloff, P.

AU - Romanovskiy, V.

AU - Romero Lamas, M.

AU - Romero Vidal, A.

AU - Roth, J. D.

AU - Rotondo, M.

AU - Rudolph, M. S.

AU - Ruf, T.

AU - Ruiz Fernandez, R. A.

AU - Ruiz Vidal, J.

AU - Ryzhikov, A.

AU - Ryzka, J.

AU - Saborido Silva, J. J.

AU - Sagidova, N.

AU - Sahoo, N.

AU - Saitta, B.

AU - Salomoni, M.

AU - Sanchez Gras, C.

AU - Santacesaria, R.

AU - Santamarina Rios, C.

AU - Santimaria, M.

AU - Santovetti, E.

AU - Saranin, D.

AU - Sarpis, G.

AU - Sarpis, M.

AU - Sarti, A.

AU - Satriano, C.

AU - Satta, A.

AU - Saur, M.

AU - Savrina, D.

AU - Sazak, H.

AU - Scantlebury Smead, L. G.

AU - Scarabotto, A.

AU - Schael, S.

AU - Scherl, S.

AU - Schiller, M.

AU - Schindler, H.

AU - Schmelling, M.

AU - Schmidt, B.

AU - Schmitt, S.

AU - Schneider, O.

AU - Schopper, A.

AU - Schubiger, M.

AU - Schulte, S.

AU - Schune, M. H.

AU - Schwemmer, R.

AU - Sciascia, B.

AU - Sellam, S.

AU - Semennikov, A.

AU - Soares, M.

AU - Sergi, A.

AU - Serra, N.

AU - Sestini, L.

AU - Seuthe, A.

AU - Shang, Y.

AU - Shangase, D. M.

AU - Shapkin, M.

AU - Shchemerov, I.

AU - Shchutska, L.

AU - Shears, T.

AU - Shekhtman, L.

AU - Shen, Z.

AU - Shevchenko, V.

AU - Shields, E. B.

AU - Shimizu, Y.

AU - Shmanin, E.

AU - Shupperd, J. D.

AU - Siddi, B. G.

AU - Silva Coutinho, R.

AU - Simi, G.

AU - Simone, S.

AU - Skidmore, N.

AU - Skwarnicki, T.

AU - Slater, M. W.

AU - Slazyk, I.

AU - Smallwood, J. C.

AU - Smeaton, J. G.

AU - Smetkina, A.

AU - Smith, E.

AU - Smith, M.

AU - Snoch, A.

AU - Soares, M.

AU - Soares Lavra, L.

AU - Sokoloff, M. D.

AU - Soler, F. J.P.

AU - Solovev, A.

AU - Solovyev, I.

AU - Souza De Almeida, F. L.

AU - Souza De Paula, B.

AU - Spaan, B.

AU - Spadaro Norella, E.

AU - Spradlin, P.

AU - Stagni, F.

AU - Stahl, M.

AU - Stahl, S.

AU - Stanislaus, S.

AU - Steinkamp, O.

AU - Stenyakin, O.

AU - Stevens, H.

AU - Stone, S.

AU - Straticiuc, M.

AU - Strekalina, D.

AU - Suljik, F.

AU - Sun, J.

AU - Sun, L.

AU - Sun, Y.

AU - Svihra, P.

AU - Swallow, P. N.

AU - Swientek, K.

AU - Szabelski, A.

AU - Szumlak, T.

AU - Szymanski, M.

AU - Taneja, S.

AU - Tanner, A. R.

AU - Tat, M. D.

AU - Terentev, A.

AU - Teubert, F.

AU - Thomas, E.

AU - Thompson, D. J.D.

AU - Thomson, K. A.

AU - Tisserand, V.

AU - T'Jampens, S.

AU - Tobin, M.

AU - Tomassetti, L.

AU - Tong, X.

AU - Torres MacHado, D.

AU - Tou, D. Y.

AU - Trifonova, E.

AU - Trippl, C.

AU - Tuci, G.

AU - Tully, A.

AU - Tuning, N.

AU - Ukleja, A.

AU - Unverzagt, D. J.

AU - Ursov, E.

AU - Usachov, A.

AU - Ustyuzhanin, A.

AU - Uwer, U.

AU - Vagner, A.

AU - Vagnoni, V.

AU - Valassi, A.

AU - Valenti, G.

AU - Valls Canudas, N.

AU - Van Beuzekom, M.

AU - Van Dijk, M.

AU - Van Hecke, H.

AU - Van Herwijnen, E.

AU - Van Hulse, C. B.

AU - Van Veghel, M.

AU - Vazquez Gomez, R.

AU - Vazquez Regueiro, P.

AU - Vázquez Sierra, C.

AU - Vecchi, S.

AU - Velthuis, J. J.

AU - Veltri, M.

AU - Venkateswaran, A.

AU - Veronesi, M.

AU - Vesterinen, M.

AU - Vieira, D.

AU - Vieites Diaz, M.

AU - Viemann, H.

AU - Vilasis-Cardona, X.

AU - Vilella Figueras, E.

AU - Villa, A.

AU - Vincent, P.

AU - Volle, F. C.

AU - Vom Bruch, D.

AU - Vorobyev, A.

AU - Vorobyev, V.

AU - Voropaev, N.

AU - Vos, K.

AU - Waldi, R.

AU - Walsh, J.

AU - Wang, C.

AU - Wang, J.

AU - Wang, M.

AU - Wang, R.

AU - Wang, Y.

AU - Wang, Z.

AU - Ward, J. A.

AU - Watson, N. K.

AU - Weber, S. G.

AU - Websdale, D.

AU - Weisser, C.

AU - Westhenry, B. D.C.

AU - White, D. J.

AU - Whitehead, M.

AU - Wiederhold, A. R.

AU - Wiedner, D.

AU - Wilkinson, G.

AU - Wilkinson, M.

AU - Williams, I.

AU - Williams, M.

AU - Williams, M. R.J.

AU - Wilson, F. F.

AU - Wislicki, W.

AU - Witek, M.

AU - Witola, L.

AU - Wotton, S. A.

AU - Wu, H.

AU - Wyllie, K.

AU - Xiang, Z.

AU - Xiao, D.

AU - Xie, Y.

AU - Xu, A.

AU - Xu, J.

AU - Xu, L.

AU - Xu, M.

AU - Xu, Q.

AU - Xu, Z.

AU - Yang, D.

AU - Yang, S.

AU - Yang, Y.

AU - Yang, Z.

AU - Yao, Y.

AU - Yeomans, L. E.

AU - Yin, H.

AU - Yu, J.

AU - Yuan, X.

AU - Yushchenko, O.

AU - Zaffaroni, E.

AU - Zavertyaev, M.

AU - Zdybal, M.

AU - Zenaiev, O.

AU - Zeng, M.

AU - Zhang, D.

AU - Zhang, L.

AU - Zhang, S.

AU - Zhang, Y.

AU - Zharkova, A.

AU - Zhelezov, A.

AU - Zheng, Y.

AU - Zhou, T.

AU - Zhou, X.

AU - Zhou, Y.

AU - Zhovkovska, V.

AU - Zhu, X.

AU - Zhu, Z.

AU - Zhukov, V.

AU - Zonneveld, J. B.

AU - Zou, Q.

AU - Zucchelli, S.

AU - Zuliani, D.

AU - Zunica, G.

AU - LHCb Collaboration

N1 - Funding Information: We express our gratitude to our colleagues in the CERN accelerator departments for the excellent performance of the LHC. We thank the technical and administrative staff at the LHCb Institutes. We acknowledge support from CERN and from the national agencies: CAPES, CNPq, FAPERJ, and FINEP (Brazil); MOST and NSFC (China); CNRS/IN2P3 (France); BMBF, DFG and MPG (Germany); INFN (Italy); NWO (Netherlands); MNiSW and NCN (Poland); MEN/IFA (Romania); MSHE (Russia); MICINN (Spain); SNSF and SER (Switzerland); NASU (Ukraine); STFC (United Kingdom); DOE NP and NSF (USA). We acknowledge the computing resources that are provided by CERN, IN2P3 (France), KIT and DESY (Germany), INFN (Italy), SURF (Netherlands), PIC (Spain), GridPP (United Kingdom), RRCKI and Yandex LLC (Russia), CSCS (Switzerland), IFIN-HH (Romania), CBPF (Brazil), PL-GRID (Poland) and NERSC (USA). We are indebted to the communities behind the multiple open-source software packages on which we depend. Individual groups or members have received support from ARC and ARDC (Australia); AvH Foundation (Germany); EPLANET, Marie Skłodowska-Curie Actions and ERC (European Union); A*MIDEX, ANR, IPhU and Labex P2IO, and Région Auvergne-Rhône-Alpes (France); Key Research Program of Frontier Sciences of CAS, CAS PIFI, CAS CCEPP, Fundamental Research Funds for the Central Universities, and the Science and Technology Program of Guangzhou (China); RFBR, RSF, and Yandex LLC (Russia); GVA, XuntaGal and GENCAT (Spain); the Leverhulme Trust, the Royal Society and UKRI (United Kingdom). Publisher Copyright: © 2022 CERN.

PY - 2022/3/1

Y1 - 2022/3/1

N2 - The photon polarization in b→sγ transitions is measured for the first time in radiative b-baryon decays exploiting the unique spin structure of Λb0→Λγ decays. A data sample corresponding to an integrated luminosity of 6 fb-1 collected by the LHCb experiment in pp collisions at a center-of-mass energy of 13 TeV is used. The photon polarization is measured to be αγ=0.82-0.26-0.13+0.17+0.04, where the first uncertainty is statistical and the second systematic. This result is in agreement with the Standard Model prediction and previous measurements in b-meson decays. Charge-parity breaking effects are studied for the first time in this observable and found to be consistent with CP symmetry.

AB - The photon polarization in b→sγ transitions is measured for the first time in radiative b-baryon decays exploiting the unique spin structure of Λb0→Λγ decays. A data sample corresponding to an integrated luminosity of 6 fb-1 collected by the LHCb experiment in pp collisions at a center-of-mass energy of 13 TeV is used. The photon polarization is measured to be αγ=0.82-0.26-0.13+0.17+0.04, where the first uncertainty is statistical and the second systematic. This result is in agreement with the Standard Model prediction and previous measurements in b-meson decays. Charge-parity breaking effects are studied for the first time in this observable and found to be consistent with CP symmetry.

UR - http://www.scopus.com/inward/record.url?scp=85128314941&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85128314941&partnerID=8YFLogxK

U2 - 10.1103/PhysRevD.105.L051104

DO - 10.1103/PhysRevD.105.L051104

M3 - Article

AN - SCOPUS:85128314941

SN - 2470-0010

VL - 105

SP - 1

EP - 11

JO - Physical Review D

JF - Physical Review D

IS - 5

M1 - L051104

ER -

Measurement of the photon polarization in Λb0 → Λγ decays

Abstract

Bibliographical note

Funding

Access to Document

Persistent URL (handle)

Other files and links

Fingerprint

Cite this