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

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.; An, L.; Anderlini, L.; Andreassi, G.; Andreotti, M.; Andrews, J. E.; Appleby, R. B.; Archilli, F.; d'Argent, P.; Arnau Romeu, J.; Artamonov, A.; Artuso, M.; Aslanides, E.; Auriemma, G.; Baalouch, M.; Babuschkin, I.; Bachmann, S.; Back, J. J.; Badalov, A.; Baesso, C.; Baker, S.; Baldini, W.; Barlow, R. J.; Barschel, C.; Barsuk, S.; Barter, W.; Baszczyk, M.; Batozskaya, V.; Batsukh, B.; Battista, V.; Bay, A.; Beaucourt, L.; Beddow, J.; Bedeschi, F.; Bediaga, I.; Bel, L. 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doi:10.1016/j.physletb.2017.01.061

Title: Measurement of CP asymmetry in D⁰ → K^-K⁺ decays

Journal Article · Fri Feb 03 00:00:00 EST 2017 · Physics Letters B

DOI:https://doi.org/10.1016/j.physletb.2017.01.061· OSTI ID:1525208

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.; An, L.; Anderlini, L.; Andreassi, G.; Andreotti, M.; Andrews, J. E. more »

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*^-→$$\bar{D}$$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⁺→$$\bar{K}$$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.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Contributing Organization:: LHCb Collaboration

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1525208

Journal Information:: Physics Letters B, Vol. 767, Issue C; ISSN 0370-2693

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 19 works

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Measurement of the time-integrated CP asymmetry in D0 → KS0KS0 decays Aaij, R.; Adeva, B.; Adinolfi, M. RWTH Aachen University https://doi.org/10.18154/rwth-2019-00084	text	January 2018
Observation of CP Violation in Charm Decays Collaboration, LHCb; Roland, Bernet,; Katharina, Müller, American Physical Society https://doi.org/10.5167/uzh-180417	text	January 2019
Observation of $C\!P$ violation in charm decays Aaij, Roel; Abellán Beteta, Carlos; Adeva, Bernardo RWTH Aachen University https://doi.org/10.18154/rwth-2019-05837	text	January 2019

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Title: Measurement of CP asymmetry in D⁰ → K^-K⁺ decays