Measurement of the time-dependent CP asymmetries in B_s⁰→ J/ψK_{\rm S}⁰

2015/03/24 by LHCb collaboration, R. Aaij, B. Adeva +700 · 1 voice
Physics and Astronomy · #hep-ex

paper · pdf · doi:10.1007/jhep06(2015)131

published as Journal of High Energy Physics 06 (2015) 131 · 18+5 pages, 5 figures, matching published version

arxiv published 2015/03/24 · arxiv created 2015/06/26 · arxiv updated 2015/06/26

Abstract

The first measurement of decay-time-dependent CP asymmetries in the decay B_s⁰→ J/ψK_{\rm S}⁰ and an updated measurement of the ratio of branching fractions B(B_s⁰→ J/ψK_{\rm S}⁰)/B(B_d⁰→ J/ψK_{\rm S}⁰) are presented. The results are obtained using data corresponding to an integrated luminosity of 3.0 fb^-1 of proton-proton collisions recorded with the LHCb detector at centre-of-mass energies of 7 and 8 TeV. The results on the CP asymmetries are A_ΔΓ(B_s⁰→ J/ψK_{\rm S}⁰) = 0.49_-0.65^+0.77(stat) ± 0.06(syst), C_{\rm dir}(B_s⁰→ J/ψK_{\rm S}⁰) = -0.28 ± 0.41(stat) ± 0.08(syst) and S_{\rm mix}(B_s⁰→ J/ψK_{\rm S}⁰) = -0.08 ± 0.40(stat) ± 0.08(syst). The ratio B(B_s⁰→ J/ψK_{\rm S}⁰)/B(B_d⁰→ J/ψK_{\rm S}⁰) is measured to be 0.0431 ± 0.0017(stat) ± 0.0012(syst) ± 0.0025(f_s/f_d), where the last uncertainty is due to the knowledge of the B_s⁰ and B_d⁰ production fractions.

Discussions

• Our B0s→J/ψK0S CP analysis is out http://arxiv.org/abs/1503.07055 @LHCbPhysics [bsky, 0 points, 0 comments]

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