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Measurement of CP violation in the phase space of B±→K±π+π− and B±→K±K+K− decays


LHCb Collaboration; et al; Bernet, R; Müller, K; Steinkamp, O; Straumann, U; Vollhardt, A (2013). Measurement of CP violation in the phase space of B±→K±π+π− and B±→K±K+K− decays. Physical Review Letters, 111(10):101801.

Abstract

The charmless decays B±→K±π+π− and B±→K±K+K− are reconstructed using data, corresponding to an integrated luminosity of 1.0  fb−1, collected by LHCb in 2011. The inclusive charge asymmetries of these modes are measured as ACP(B±→K±π+π−)=0.032±0.008 (stat)±0.004 (syst)±0.007(J/ψK±) and ACP(B±→K±K+K−)=−0.043±0.009 (stat)±0.003 (syst)±0.007(J/ψK±), where the third uncertainty is due to the CP asymmetry of the B±→J/ψK± reference mode. The significance of ACP(B±→K±K+K−) exceeds three standard deviations and is the first evidence of an inclusive CP asymmetry in charmless three-body B decays. In addition to the inclusive CP asymmetries, larger asymmetries are observed in localized regions of phase space.

Abstract

The charmless decays B±→K±π+π− and B±→K±K+K− are reconstructed using data, corresponding to an integrated luminosity of 1.0  fb−1, collected by LHCb in 2011. The inclusive charge asymmetries of these modes are measured as ACP(B±→K±π+π−)=0.032±0.008 (stat)±0.004 (syst)±0.007(J/ψK±) and ACP(B±→K±K+K−)=−0.043±0.009 (stat)±0.003 (syst)±0.007(J/ψK±), where the third uncertainty is due to the CP asymmetry of the B±→J/ψK± reference mode. The significance of ACP(B±→K±K+K−) exceeds three standard deviations and is the first evidence of an inclusive CP asymmetry in charmless three-body B decays. In addition to the inclusive CP asymmetries, larger asymmetries are observed in localized regions of phase space.

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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:20 Feb 2014 13:55
Last Modified:16 Feb 2018 19:38
Publisher:American Physical Society
ISSN:0031-9007
OA Status:Hybrid
Publisher DOI:https://doi.org/10.1103/PhysRevLett.111.101801

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