Evidence for CP violation in time-integrated D0 → h-h+ decay rates

LHCb Collaboration

doi:10.1103/PhysRevLett.108.111602

Evidence for CP violation in time-integrated D⁰ → h^-h⁺ decay rates

LHCb Collaboration

Research output: Contribution to journal › Article › peer-review

Abstract

A search for time-integrated CP violation in D⁰ → h^-h⁺ (h = K, π) decays is presented using 0.62 fb^-1 of data collected by LHCb in 2011. The flavor of the charm meson is determined by the charge of the slow pion in the D∗⁺ → D⁰π⁺ and D∗^- → D¯⁰π^- decay chains. The difference in CP asymmetry between D⁰ → K^-K⁺ and D⁰ → π^-π⁺, ΔA_CP ≈ A_CP(K^-K⁺)-A_CP(π^-π⁺), is measured to be [-0.82 ± 0.21(stat) ± 0.11(syst)]%. This differs from the hypothesis of CP conservation by 3.5 standard deviations.

Original language	English
Article number	111602
Journal	Physical Review Letters
Volume	108
Issue number	11
DOIs	https://doi.org/10.1103/PhysRevLett.108.111602
Publication status	Published - 12 Mar 2012
Externally published	Yes

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10.1103/PhysRevLett.108.111602

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@article{6ade16fd28974909a937776a8a2b5a17,

title = "Evidence for CP violation in time-integrated D0 → h-h+ decay rates",

abstract = "A search for time-integrated CP violation in D0 → h-h+ (h = K, π) decays is presented using 0.62 fb-1 of data collected by LHCb in 2011. The flavor of the charm meson is determined by the charge of the slow pion in the D∗+ → D0π+ and D∗- → D¯0π- decay chains. The difference in CP asymmetry between D0 → K-K+ and D0 → π-π+, ΔACP ≈ ACP(K-K+)-ACP(π-π+), is measured to be [-0.82 ± 0.21(stat) ± 0.11(syst)]\%. This differs from the hypothesis of CP conservation by 3.5 standard deviations.",

author = "\{LHCb Collaboration\} and R. Aaij and \{Abellan Beteta\}, C. and B. Adeva and M. Adinolfi and C. Adrover and A. Affolder and Z. Ajaltouni and J. Albrecht and F. Alessio and M. Alexander and G. Alkhazov and \{Alvarez Cartelle\}, P. and Alves, \{A. A.\} and S. Amato and Y. Amhis and J. Anderson and Appleby, \{R. B.\} and \{Aquines Gutierrez\}, O. and F. Archilli and L. Arrabito and A. Artamonov and M. Artuso and E. Aslanides and G. Auriemma and S. Bachmann and Back, \{J. J.\} and Bailey, \{D. S.\} and V. Balagura and W. Baldini and Barlow, \{R. J.\} and C. Barschel and S. Barsuk and W. Barter and A. Bates and C. Bauer and Th Bauer and A. Bay and I. Bediaga and S. Belogurov and K. Belous and I. Belyaev and E. Ben-Haim and M. Benayoun and G. Bencivenni and S. Benson and J. Benton and R. Bernet and Bettler, \{M. O.\} and \{Van Beuzekom\}, M. and E. Maurice",

year = "2012",

month = mar,

day = "12",

doi = "10.1103/PhysRevLett.108.111602",

language = "English",

volume = "108",

journal = "Physical Review Letters",

issn = "0031-9007",

number = "11",

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TY - JOUR

T1 - Evidence for CP violation in time-integrated D0 → h-h+ decay rates

AU - LHCb Collaboration

AU - Aaij, R.

AU - Abellan Beteta, C.

AU - Adeva, B.

AU - Adinolfi, M.

AU - Adrover, C.

AU - Affolder, A.

AU - Ajaltouni, Z.

AU - Albrecht, J.

AU - Alessio, F.

AU - Alexander, M.

AU - Alkhazov, G.

AU - Alvarez Cartelle, P.

AU - Alves, A. A.

AU - Amato, S.

AU - Amhis, Y.

AU - Anderson, J.

AU - Appleby, R. B.

AU - Aquines Gutierrez, O.

AU - Archilli, F.

AU - Arrabito, L.

AU - Artamonov, A.

AU - Artuso, M.

AU - Aslanides, E.

AU - Auriemma, G.

AU - Bachmann, S.

AU - Back, J. J.

AU - Bailey, D. S.

AU - Balagura, V.

AU - Baldini, W.

AU - Barlow, R. J.

AU - Barschel, C.

AU - Barsuk, S.

AU - Barter, W.

AU - Bates, A.

AU - Bauer, C.

AU - Bauer, Th

AU - Bay, A.

AU - Bediaga, I.

AU - Belogurov, S.

AU - Belous, K.

AU - Belyaev, I.

AU - Ben-Haim, E.

AU - Benayoun, M.

AU - Bencivenni, G.

AU - Benson, S.

AU - Benton, J.

AU - Bernet, R.

AU - Bettler, M. O.

AU - Van Beuzekom, M.

AU - Maurice, E.

PY - 2012/3/12

Y1 - 2012/3/12

N2 - A search for time-integrated CP violation in D0 → h-h+ (h = K, π) decays is presented using 0.62 fb-1 of data collected by LHCb in 2011. The flavor of the charm meson is determined by the charge of the slow pion in the D∗+ → D0π+ and D∗- → D¯0π- decay chains. The difference in CP asymmetry between D0 → K-K+ and D0 → π-π+, ΔACP ≈ ACP(K-K+)-ACP(π-π+), is measured to be [-0.82 ± 0.21(stat) ± 0.11(syst)]%. This differs from the hypothesis of CP conservation by 3.5 standard deviations.

AB - A search for time-integrated CP violation in D0 → h-h+ (h = K, π) decays is presented using 0.62 fb-1 of data collected by LHCb in 2011. The flavor of the charm meson is determined by the charge of the slow pion in the D∗+ → D0π+ and D∗- → D¯0π- decay chains. The difference in CP asymmetry between D0 → K-K+ and D0 → π-π+, ΔACP ≈ ACP(K-K+)-ACP(π-π+), is measured to be [-0.82 ± 0.21(stat) ± 0.11(syst)]%. This differs from the hypothesis of CP conservation by 3.5 standard deviations.

UR - https://www.scopus.com/pages/publications/84860838347

U2 - 10.1103/PhysRevLett.108.111602

DO - 10.1103/PhysRevLett.108.111602

M3 - Article

AN - SCOPUS:84860838347

SN - 0031-9007

VL - 108

JO - Physical Review Letters

JF - Physical Review Letters

IS - 11

M1 - 111602

ER -

Evidence for CP violation in time-integrated D⁰ → h^-h⁺ decay rates

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