Observation of Multiplicity Dependent Prompt χc1 (3872) and ψ (2S) Production in pp Collisions

(LHCb Collaboration)

doi:10.1103/PhysRevLett.126.092001

Observation of Multiplicity Dependent Prompt χc1 (3872) and ψ (2S) Production in pp Collisions

(LHCb Collaboration)

(Astro)-Particles Physics

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

Abstract

The production of χc1(3872) and ψ(2S) hadrons is studied as a function of charged particle multiplicity in pp collisions at a center-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 2 fb-1. For both states, the fraction that is produced promptly at the collision vertex is found to decrease as charged particle multiplicity increases. The ratio of χc1(3872) to ψ(2S) cross sections for promptly produced particles is also found to decrease with multiplicity, while no significant dependence on multiplicity is observed for the equivalent ratio of particles produced away from the collision vertex in b-hadron decays. This behavior is consistent with a calculation that models the χc1(3872) structure as a compact tetraquark. Comparisons with model calculations and implications for the binding energy of the χc1(3872) state are discussed.

Original language	English
Article number	092001
Pages (from-to)	1-11
Number of pages	11
Journal	Physical review letters
Volume	126
Issue number	9
DOIs	https://doi.org/10.1103/PhysRevLett.126.092001
Publication status	Published - 5 Mar 2021

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10.1103/PhysRevLett.126.092001

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@article{a89c801990b343a693e437a45f335c9f,

title = "Observation of Multiplicity Dependent Prompt χc1 (3872) and ψ (2S) Production in pp Collisions",

abstract = "The production of χc1(3872) and ψ(2S) hadrons is studied as a function of charged particle multiplicity in pp collisions at a center-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 2 fb-1. For both states, the fraction that is produced promptly at the collision vertex is found to decrease as charged particle multiplicity increases. The ratio of χc1(3872) to ψ(2S) cross sections for promptly produced particles is also found to decrease with multiplicity, while no significant dependence on multiplicity is observed for the equivalent ratio of particles produced away from the collision vertex in b-hadron decays. This behavior is consistent with a calculation that models the χc1(3872) structure as a compact tetraquark. Comparisons with model calculations and implications for the binding energy of the χc1(3872) state are discussed.",

author = "R. Aaij and {Abell{\'a}n Beteta}, C. and T. Ackernley and B. Adeva and M. Adinolfi and H. Afsharnia 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 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 S. Baker and {Baladron Rodriguez}, P. and V. Balagura and W. Baldini and {Baptista Leite}, J. and Barlow, {R. J.} and S. Barsuk and W. Barter and M. Bartolini and F. Baryshnikov and Basels, {J. M.} and G. Bassi and B. Batsukh and A. Battig and A. Bay 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 E. Bertholet and A. Bertolin and C. Betancourt and F. Betti and Bettler, {M. O.} 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. 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 M. Brodski and J. Brodzicka and {Brossa Gonzalo}, A. and D. Brundu and A. Buonaura 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 A. Camboni and P. Campana and {Campora Perez}, {D. H.} 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 {Carvalho Akiba}, K. and {Casais Vidal}, A. and G. Casse and M. Cattaneo and G. Cavallero and S. Celani and J. Cerasoli 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 Chitic, {S. G.} 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 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 E. Dall'Occo and J. Dalseno and C. D'Ambrosio and A. Danilina and P. D'Argent 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 Vries}, {J. A.} and Dean, {C. T.} and W. Dean and D. Decamp 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 Nezza}, P. and S. Didenko and {Dieste Maronas}, L. and H. Dijkstra and V. Dobishuk and Donohoe, {A. M.} and F. Dordei and {Dos Reis}, {A. C.} and L. Douglas and A. Dovbnya and Downes, {A. G.} and K. Dreimanis and Dudek, {M. W.} and L. Dufour and V. Duk and P. Durante and Durham, {J. M.} and D. Dutta and M. Dziewiecki 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 N. Farley and S. Farry and D. Fazzini and P. Fedin and M. F{\'e}o and {Fernandez Declara}, P. and {Fernandez Prieto}, A. 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 C. Fitzpatrick and T. Fiutowski and F. Fleuret and M. Fontana and F. Fontanelli and R. Forty 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 W. Funk and E. Gabriel and T. Gaintseva and {Gallas Torreira}, A. and D. Galli and S. 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Gromov and L. Gruber and {Gruberg Cazon}, {B. R.} and C. Gu and M. Guarise 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 Haines, {S. C.} and T. Halewood-Leagas and Hamilton, {P. M.} and Q. Han and X. Han and Hancock, {T. H.} 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 Hopchev, {P. H.} and J. Hu and J. Hu and W. 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 S. Jakobsen and E. Jans and Jashal, {B. K.} and A. Jawahery and V. Jevtic and M. Jezabek and F. Jiang and M. John and D. 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Yang and Z. Yang and Y. Yao and Yeomans, {L. E.} and H. Yin and J. Yu and X. Yuan and O. Yushchenko and Zarebski, {K. A.} and M. Zavertyaev and M. Zdybal and O. Zenaiev and M. Zeng and D. Zhang and L. Zhang and S. Zhang and Y. Zhang and A. Zhelezov and Y. Zheng and X. Zhou and Y. Zhou and X. Zhu and V. Zhukov and Zonneveld, {J. B.} and S. Zucchelli and D. Zuliani and G. Zunica and {(LHCb Collaboration)}",

year = "2021",

month = mar,

day = "5",

doi = "10.1103/PhysRevLett.126.092001",

language = "English",

volume = "126",

pages = "1--11",

journal = "Physical review letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "9",

}

TY - JOUR

T1 - Observation of Multiplicity Dependent Prompt χc1 (3872) and ψ (2S) Production in pp Collisions

AU - Aaij, R.

AU - Abellán Beteta, C.

AU - Ackernley, T.

AU - Adeva, B.

AU - Adinolfi, M.

AU - Afsharnia, H.

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 - 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 - Baker, S.

AU - Baladron Rodriguez, P.

AU - Balagura, V.

AU - Baldini, W.

AU - Baptista Leite, J.

AU - Barlow, R. J.

AU - Barsuk, S.

AU - Barter, W.

AU - Bartolini, M.

AU - Baryshnikov, F.

AU - Basels, J. M.

AU - Bassi, G.

AU - Batsukh, B.

AU - Battig, A.

AU - Bay, 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 - Bertholet, E.

AU - Bertolin, A.

AU - Betancourt, C.

AU - Betti, F.

AU - Bettler, M. O.

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 - 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.

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AU - Zunica, G.

AU - (LHCb Collaboration)

PY - 2021/3/5

Y1 - 2021/3/5

N2 - The production of χc1(3872) and ψ(2S) hadrons is studied as a function of charged particle multiplicity in pp collisions at a center-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 2 fb-1. For both states, the fraction that is produced promptly at the collision vertex is found to decrease as charged particle multiplicity increases. The ratio of χc1(3872) to ψ(2S) cross sections for promptly produced particles is also found to decrease with multiplicity, while no significant dependence on multiplicity is observed for the equivalent ratio of particles produced away from the collision vertex in b-hadron decays. This behavior is consistent with a calculation that models the χc1(3872) structure as a compact tetraquark. Comparisons with model calculations and implications for the binding energy of the χc1(3872) state are discussed.

AB - The production of χc1(3872) and ψ(2S) hadrons is studied as a function of charged particle multiplicity in pp collisions at a center-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 2 fb-1. For both states, the fraction that is produced promptly at the collision vertex is found to decrease as charged particle multiplicity increases. The ratio of χc1(3872) to ψ(2S) cross sections for promptly produced particles is also found to decrease with multiplicity, while no significant dependence on multiplicity is observed for the equivalent ratio of particles produced away from the collision vertex in b-hadron decays. This behavior is consistent with a calculation that models the χc1(3872) structure as a compact tetraquark. Comparisons with model calculations and implications for the binding energy of the χc1(3872) state are discussed.

UR - http://www.scopus.com/inward/record.url?scp=85102208596&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85102208596&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.126.092001

DO - 10.1103/PhysRevLett.126.092001

M3 - Article

C2 - 33750184

AN - SCOPUS:85102208596

SN - 0031-9007

VL - 126

SP - 1

EP - 11

JO - Physical review letters

JF - Physical review letters

IS - 9

M1 - 092001

ER -

Observation of Multiplicity Dependent Prompt χc1 (3872) and ψ (2S) Production in pp Collisions

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