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First observation of CP violation in the decays of Bs mesons


LHCb Collaboration; et al; Bernet, R; Steinkamp, O; Müller, K; Straumann, U; Vollhardt, A (2013). First observation of CP violation in the decays of Bs mesons. Physical Review Letters, 110:221601.

Abstract

Using pp collision data corresponding to an integrated luminosity of 1.0  fb−1 and collected by LHCb in 2011 at a center-of-mass energy of 7 TeV, we report the measurement of direct CP violation in B0s→K−π+ decays, ACP(B0s→K−π+)=0.27±0.04 (stat)±0.01 (syst), with significance exceeding 5 standard deviations. This is the first observation of CP violation in the decays of B0s mesons. Furthermore, we provide an improved determination of direct CP violation in B0→K+π− decays, ACP(B0→K+π−)=−0.080±0.007 (stat)±0.003 (syst), which is the most precise measurement of this quantity to date.

Abstract

Using pp collision data corresponding to an integrated luminosity of 1.0  fb−1 and collected by LHCb in 2011 at a center-of-mass energy of 7 TeV, we report the measurement of direct CP violation in B0s→K−π+ decays, ACP(B0s→K−π+)=0.27±0.04 (stat)±0.01 (syst), with significance exceeding 5 standard deviations. This is the first observation of CP violation in the decays of B0s mesons. Furthermore, we provide an improved determination of direct CP violation in B0→K+π− decays, ACP(B0→K+π−)=−0.080±0.007 (stat)±0.003 (syst), which is the most precise measurement of this quantity to date.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2013
Deposited On:21 Feb 2014 09:37
Last Modified:05 Apr 2016 17:35
Publisher:American Physical Society
ISSN:0031-9007
Publisher DOI:https://doi.org/10.1103/PhysRevLett.110.221601

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