Measurement of CP asymmetry in D0 → K−K+ decays

R. Aaij; B. Adeva; M. Adinolfi; Z. Ajaltouni; S. Akar; J. Albrecht; F. Alessio; M. Alexander; S. Ali; G. Alkhazov; P. Alvarez Cartelle; A. A. Alves; S. Amato; S. Amerio; Y. Amhis; LA Everse; L. Anderlini; G. Andreassi; M. Andreotti; J.E. Andrews; R. B. Appleby; F. Archilli; P. d'Argent; J. Arnau Romeu; A. Artamonov; M. Artuso; E. Aslanides; G. Auriemma; M. Baalouch; I. Babuschkin; K. Carvalho Akiba; V. Coco; P. N Y David; K. De Bruyn; M. Ferro-Luzzi; T. Ketel; R. F. Koopman; J. van Leerdam; M. Merk; C. J G Onderwater; G. Raven; M. Schiller; N. Serra; H. Snoek; B. Storaci; V. Syropoulos; J. van Tilburg; S. Tolk; P. Tsopelas; N. Tuning; The LHCb Collaboration

doi:10.1016/j.physletb.2017.01.061

Measurement of CP asymmetry in D⁰ → K⁻K⁺ decays

R. Aaij, B. Adeva, M. Adinolfi, Z. Ajaltouni, S. Akar, J. Albrecht, F. Alessio, M. Alexander, S. Ali, G. Alkhazov, P. Alvarez Cartelle, A. A. Alves, S. Amato, S. Amerio, Y. Amhis, LA Everse, L. Anderlini, G. Andreassi, M. Andreotti, J.E. AndrewsR. B. Appleby, F. Archilli, P. d'Argent, J. Arnau Romeu, A. Artamonov, M. Artuso, E. Aslanides, G. Auriemma, M. Baalouch, I. Babuschkin, K. Carvalho Akiba, V. Coco, P. N Y David, K. De Bruyn, M. Ferro-Luzzi, T. Ketel, R. F. Koopman, J. van Leerdam, M. Merk, C. J G Onderwater, G. Raven, M. Schiller, N. Serra, H. Snoek, B. Storaci, V. Syropoulos, J. van Tilburg, S. Tolk, P. Tsopelas, N. Tuning, The LHCb Collaboration

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

Abstract

A measurement of the time-integrated CP asymmetry in the Cabibbo-suppressed decay D⁰→K⁻K⁺ is performed using pp collision data, corresponding to an integrated luminosity of 3 fb⁻¹, collected with the LHCb detector at centre-of-mass energies of 7 and 8 TeV. The flavour of the charm meson at production is determined from the charge of the pion in D^⁎+→D⁰π⁺ and D^⁎−→D‾⁰π⁻ decays. The time-integrated CP asymmetry A_CP(K⁻K⁺) is obtained assuming negligible CP violation in charm mixing and in Cabibbo-favoured D⁰→K⁻π⁺, D⁺→K⁻π⁺π⁺ and D⁺→K‾⁰π⁺ decays used as calibration channels. It is found to be A_CP(K⁻K⁺)=(0.14±0.15 (stat)±0.10 (syst))%.

A combination of this result with previous LHCb measurements yields A_CP(K⁻K⁺)=(0.04±0.12 (stat)±0.10 (syst))%,A_CP(π⁻π⁺)=(0.07±0.14 (stat)±0.11 (syst))%. These are the most precise measurements from a single experiment. The result for A_CP(K⁻K⁺) is the most precise determination of a time-integrated CP asymmetry in the charm sector to date, and neither measurement shows evidence of CP asymmetry.

Original language	English
Pages (from-to)	177-187
Number of pages	11
Journal	Physics Letters B
Volume	767
DOIs	https://doi.org/10.1016/j.physletb.2017.01.061
Publication status	Published - 10 Apr 2017

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); NSFC (China); CNRS/IN2P3 (France); BMBF, DFG and MPG (Germany); INFN (Italy); FOM and NWO (The Netherlands); MNiSW and NCN (Poland); MEN/IFA (Romania); MinES and FASO (Russia); MINECO (Spain); SNSF and SER (Switzerland); NASU (Ukraine); STFC (United Kingdom); NSF (USA). We acknowledge the computing resources that are provided by CERN, IN2P3 (France), KIT and DESY (Germany), INFN (Italy), SURF (The Netherlands), PIC (Spain), GridPP (United Kingdom), RRCKI and Yandex LLC (Russia), CSCS (Switzerland), IFIN-HH (Romania), CBPF (Brazil), PL-GRID (Poland) and OSC (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 AvH Foundation (Germany), EPLANET, Marie Skłodowska-Curie Actions and ERC (European Union), Conseil Général de Haute-Savoie, Labex ENIGMASS and OCEVU, Région Auvergne (France), RFBR and Yandex LLC (Russia), GVA, XuntaGal and GENCAT (Spain), Herchel Smith Fund, The Royal Society, Royal Commission for the Exhibition of 1851 and the Leverhulme Trust (United Kingdom).

Funders	Funder number
Conseil Général de Haute-Savoie
EPLANET
GridPP
Herchel Smith Fund
Labex ENIGMASS
MinES
OCEVU
PL-GRID
RRCKI
SURF
Yandex LLC
National Science Foundation
Alexander von Humboldt-Stiftung
Karlsruhe Institute of Technology
H2020 Marie Skłodowska-Curie Actions
CERN
Institutul National de Cercetare-Dezvoltare pentru Fizica si Inginerie Nucleara 'Horia Hulubei'
Science and Technology Facilities Council	ST/N000250/1, ST/H006737/1, ST/N000331/1, ST/K00140X/1, GRIDPP, LHCb Upgrades, 1707993, ST/J004332/1, 1641747, 1681016, ST/K003410/1, 1708182, LHCb
Leverhulme Trust
Royal Society
Royal Commission for the Exhibition of 1851
European Commission
European Research Council
Deutsches Elektronen-Synchrotron
Deutsche Forschungsgemeinschaft
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung	166208
Stichting voor Fundamenteel Onderzoek der Materie
National Natural Science Foundation of China
Russian Foundation for Basic Research
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
Bundesministerium für Bildung und Forschung
Nederlandse Organisatie voor Wetenschappelijk Onderzoek
Ministerio de Economía y Competitividad
Generalitat Valenciana
Conselho Nacional de Desenvolvimento Científico e Tecnológico
Instituto Nazionale di Fisica Nucleare
Narodowe Centrum Nauki
Ministerstwo Edukacji i Nauki
Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro
National Academy of Sciences of Ukraine
Centre National de la Recherche Scientifique
Financiadora de Estudos e Projetos
Région Auvergne-Rhône-Alpes
Institut national de physique nucléaire et de physique des particules
Federal Agency for Scientific Organizations
Sociedad Española de Reumatología

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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Aaij, R., Adeva, B., Adinolfi, M., Ajaltouni, Z., Akar, S., Albrecht, J., Alessio, F., Alexander, M., Ali, S., Alkhazov, G., Alvarez Cartelle, P., Alves, A. A., Amato, S., Amerio, S., Amhis, Y., Everse, LA., Anderlini, L., Andreassi, G., Andreotti, M., ... The LHCb Collaboration (2017). Measurement of CP asymmetry in D⁰ → K⁻K⁺ decays. Physics Letters B, 767, 177-187. https://doi.org/10.1016/j.physletb.2017.01.061

@article{80833c8a63974414aa9bf2ff891f3dee,

title = "Measurement of CP asymmetry in D0 → K−K+ decays",

abstract = "A measurement of the time-integrated CP asymmetry in the Cabibbo-suppressed decay D0→K−K+ is performed using pp collision data, corresponding to an integrated luminosity of 3 fb−1, collected with the LHCb detector at centre-of-mass energies of 7 and 8 TeV. The flavour of the charm meson at production is determined from the charge of the pion in D⁎+→D0π+ and D⁎−→D‾0π− decays. The time-integrated CP asymmetry ACP(K−K+) is obtained assuming negligible CP violation in charm mixing and in Cabibbo-favoured D0→K−π+, D+→K−π+π+ and D+→K‾0π+ decays used as calibration channels. It is found to be ACP(K−K+)=(0.14±0.15 (stat)±0.10 (syst))%. A combination of this result with previous LHCb measurements yields ACP(K−K+)=(0.04±0.12 (stat)±0.10 (syst))%,ACP(π−π+)=(0.07±0.14 (stat)±0.11 (syst))%. These are the most precise measurements from a single experiment. The result for ACP(K−K+) is the most precise determination of a time-integrated CP asymmetry in the charm sector to date, and neither measurement shows evidence of CP asymmetry.",

author = "R. Aaij and B. Adeva and M. Adinolfi and Z. Ajaltouni and S. Akar and J. Albrecht and F. Alessio and M. Alexander and S. Ali and G. Alkhazov and {Alvarez Cartelle}, P. and Alves, {A. A.} and S. Amato and S. Amerio and Y. Amhis and LA Everse and L. Anderlini and G. Andreassi and M. Andreotti and J.E. Andrews and Appleby, {R. B.} and F. Archilli and P. d'Argent and {Arnau Romeu}, J. and A. Artamonov and M. Artuso and E. Aslanides and G. Auriemma and M. Baalouch and I. Babuschkin and {Carvalho Akiba}, K. and V. Coco and David, {P. N Y} and {De Bruyn}, K. and M. Ferro-Luzzi and T. Ketel and Koopman, {R. F.} and {van Leerdam}, J. and M. Merk and Onderwater, {C. J G} and G. Raven and M. Schiller and N. Serra and H. Snoek and B. Storaci and V. Syropoulos and {van Tilburg}, J. and S. Tolk and P. Tsopelas and N. Tuning and {The LHCb Collaboration}",

year = "2017",

month = apr,

day = "10",

doi = "10.1016/j.physletb.2017.01.061",

language = "English",

volume = "767",

pages = "177--187",

journal = "Physics Letters B",

issn = "0370-2693",

publisher = "Elsevier",

}

Aaij, R, Adeva, B, Adinolfi, M, Ajaltouni, Z, Akar, S, Albrecht, J, Alessio, F, Alexander, M, Ali, S, Alkhazov, G, Alvarez Cartelle, P, Alves, AA, Amato, S, Amerio, S, Amhis, Y, Everse, LA, Anderlini, L, Andreassi, G, Andreotti, M, Andrews, JE, Appleby, RB, Archilli, F, d'Argent, P, Arnau Romeu, J, Artamonov, A, Artuso, M, Aslanides, E, Auriemma, G, Baalouch, M, Babuschkin, I, Carvalho Akiba, K, Coco, V, David, PNY, De Bruyn, K, Ferro-Luzzi, M, Ketel, T, Koopman, RF, van Leerdam, J, Merk, M, Onderwater, CJG, Raven, G, Schiller, M, Serra, N, Snoek, H, Storaci, B, Syropoulos, V, van Tilburg, J, Tolk, S, Tsopelas, P, Tuning, N & The LHCb Collaboration 2017, 'Measurement of CP asymmetry in D⁰ → K⁻K⁺ decays', Physics Letters B, vol. 767, pp. 177-187. https://doi.org/10.1016/j.physletb.2017.01.061

TY - JOUR

T1 - Measurement of CP asymmetry in D0 → K−K+ decays

AU - Aaij, R.

AU - Adeva, B.

AU - Adinolfi, M.

AU - Ajaltouni, Z.

AU - Akar, S.

AU - Albrecht, J.

AU - Alessio, F.

AU - Alexander, M.

AU - Ali, S.

AU - Alkhazov, G.

AU - Alvarez Cartelle, P.

AU - Alves, A. A.

AU - Amato, S.

AU - Amerio, S.

AU - Amhis, Y.

AU - Everse, LA

AU - Anderlini, L.

AU - Andreassi, G.

AU - Andreotti, M.

AU - Andrews, J.E.

AU - Appleby, R. B.

AU - Archilli, F.

AU - d'Argent, P.

AU - Arnau Romeu, J.

AU - Artamonov, A.

AU - Artuso, M.

AU - Aslanides, E.

AU - Auriemma, G.

AU - Baalouch, M.

AU - Babuschkin, I.

AU - Carvalho Akiba, K.

AU - Coco, V.

AU - David, P. N Y

AU - De Bruyn, K.

AU - Ferro-Luzzi, M.

AU - Ketel, T.

AU - Koopman, R. F.

AU - van Leerdam, J.

AU - Merk, M.

AU - Onderwater, C. J G

AU - Raven, G.

AU - Schiller, M.

AU - Serra, N.

AU - Snoek, H.

AU - Storaci, B.

AU - Syropoulos, V.

AU - van Tilburg, J.

AU - Tolk, S.

AU - Tsopelas, P.

AU - Tuning, N.

AU - The LHCb Collaboration

PY - 2017/4/10

Y1 - 2017/4/10

N2 - A measurement of the time-integrated CP asymmetry in the Cabibbo-suppressed decay D0→K−K+ is performed using pp collision data, corresponding to an integrated luminosity of 3 fb−1, collected with the LHCb detector at centre-of-mass energies of 7 and 8 TeV. The flavour of the charm meson at production is determined from the charge of the pion in D⁎+→D0π+ and D⁎−→D‾0π− decays. The time-integrated CP asymmetry ACP(K−K+) is obtained assuming negligible CP violation in charm mixing and in Cabibbo-favoured D0→K−π+, D+→K−π+π+ and D+→K‾0π+ decays used as calibration channels. It is found to be ACP(K−K+)=(0.14±0.15 (stat)±0.10 (syst))%. A combination of this result with previous LHCb measurements yields ACP(K−K+)=(0.04±0.12 (stat)±0.10 (syst))%,ACP(π−π+)=(0.07±0.14 (stat)±0.11 (syst))%. These are the most precise measurements from a single experiment. The result for ACP(K−K+) is the most precise determination of a time-integrated CP asymmetry in the charm sector to date, and neither measurement shows evidence of CP asymmetry.

AB - A measurement of the time-integrated CP asymmetry in the Cabibbo-suppressed decay D0→K−K+ is performed using pp collision data, corresponding to an integrated luminosity of 3 fb−1, collected with the LHCb detector at centre-of-mass energies of 7 and 8 TeV. The flavour of the charm meson at production is determined from the charge of the pion in D⁎+→D0π+ and D⁎−→D‾0π− decays. The time-integrated CP asymmetry ACP(K−K+) is obtained assuming negligible CP violation in charm mixing and in Cabibbo-favoured D0→K−π+, D+→K−π+π+ and D+→K‾0π+ decays used as calibration channels. It is found to be ACP(K−K+)=(0.14±0.15 (stat)±0.10 (syst))%. A combination of this result with previous LHCb measurements yields ACP(K−K+)=(0.04±0.12 (stat)±0.10 (syst))%,ACP(π−π+)=(0.07±0.14 (stat)±0.11 (syst))%. These are the most precise measurements from a single experiment. The result for ACP(K−K+) is the most precise determination of a time-integrated CP asymmetry in the charm sector to date, and neither measurement shows evidence of CP asymmetry.

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