Measurement of the CP violation phase $\phi_s$ in the $B_s$ system at LHCb

The interference between Bs decay amplitudes to CP eigenstates Jpsi X directly or including Bs-Bsbar oscillation gives rise to a measurable CP violating phase phi_s. Here, a preliminary measurement of phi_s with Bs -> JpsiK+K- decays, and the measurement using Bs->Jpsipi+pi- decays, both obtai...

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Bibliographic Details
Main Author Raven, Gerhard
Format Journal Article
LanguageEnglish
Published 17.12.2012
Subjects
Physics - High Energy Physics - Experiment
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Summary:The interference between Bs decay amplitudes to CP eigenstates Jpsi X directly or including Bs-Bsbar oscillation gives rise to a measurable CP violating phase phi_s. Here, a preliminary measurement of phi_s with Bs -> JpsiK+K- decays, and the measurement using Bs->Jpsipi+pi- decays, both obtained from a sample of 1/fb of pp collisions, collected by the LHCb experiment at a centre-of-mass energy sqrt{s}=7 TeV during 2011, are presented. In addition, the determination of the branching fraction and polarization fractions of Bs->JpsiKstbar, which can be used to constrain the contribution of sub-leading penguin contributions to the decay Bs->Jpsi phi, is shown.
DOI:10.48550/arxiv.1212.4140