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

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 productio...

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Main Authors: Aaij, Roel (Author) , D'Argent, Philippe (Author) , Bachmann, Sebastian (Author) , Braun, Svende (Author) , Comerma-Montells, Albert (Author) , De Cian, Michel (Author) , Esen, Sevda (Author) , Gerick, David (Author) , Gersabeck, Evelina (Author) , Han, Xiaoxue (Author) , Hansmann-Menzemer, Stephanie (Author) , Kecke, Matthieu (Author) , Khanji, Basem (Author) , Kolpin, Michael (Author) , Leverington, Blake (Author) , Marks, Jörg (Author) , Mitzel, Dominik (Author) , Neubert, Sebastian (Author) , Neuner, Max (Author) , Piucci, Alessio (Author) , Stahl, Marian (Author) , Stemmle, Simon (Author) , Uwer, Ulrich (Author) , Waldi, Roland (Author) , Zhelezov, Alexey (Author)
Corporate Author: LHCb Collaboration (Author)
Format: Article (Journal)
Language:English
Published: 3 February 2017
In: Physics letters
Year: 2017, Volume: 767, Pages: 177-187
ISSN:1873-2445
DOI:10.1016/j.physletb.2017.01.061
Online Access:Verlag, kostenfrei, Volltext: http://dx.doi.org/10.1016/j.physletb.2017.01.061
Verlag, kostenfrei, Volltext: http://www.sciencedirect.com/science/article/pii/S0370269317300795
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Author Notes:the LHCb Collaboration
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Summary: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 beACP(K−K+)=(0.14±0.15 (stat)±0.10 (syst))%. A combination of this result with previous LHCb measurements yieldsACP(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.
Item Description:Im Titel werden die Zeichen "0", "+" und "-" hochgestellt
The LHCb collaboration: R. Aaij, P. d’Argent, S. Bachmann, S. Braun, A. Comerma-Montells, M. De Cian, S. Esen, D.Gerick, E. Gersabeck, X.Han, S. Hansmann-Menzemer, M. Kecke, B. Khanji, M. Kolpin, B. Leverington, J. Marks, D.S. Mitzel, S. Neubert, M. Neuner, A. Piucci, M. Stahl, S. Stemmle, U. Uwer, R. Waldi, A. Zhelezov [und weitere]
Gesehen am 21.10.2020
Physical Description:Online Resource
ISSN:1873-2445
DOI:10.1016/j.physletb.2017.01.061

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