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Article Dans Une Revue Journal of High Energy Physics Année : 2015

Measurement of the time-dependent CP asymmetries in B0s→J/ψK0S

O. Leroy
J. Serrano

Résumé

The first measurement of decay-time-dependent CP asymmetries in the decay B0s→J/ψK0S and an updated measurement of the ratio of branching fractions B(B0s→J/ψK0S)/B(B0d→J/ψK0S)} 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 AΔΓ(B0s→J/ψK0S)=0.49+0.77−0.65(stat)±0.06(syst), Cdir(B0s→J/ψK0S)=−0.28±0.41(stat)±0.08(syst) and Smix(B0s→J/ψK0S)=−0.08±0.40(stat)±0.08(syst). The ratio B(B0s→J/ψK0S)/B(B0d→J/ψK0S) is measured to be 0.0431±0.0017(stat)±0.0012(syst)±0.0025(fs/fd), where the last uncertainty is due to the knowledge of the B0s and B0d production fractions.

Dates et versions

in2p3-01135710 , version 1 (25-03-2015)

Identifiants

Citer

R. Aaij, Y. Amhis, S. Barsuk, M. Borsato, O. Kochebina, et al.. Measurement of the time-dependent CP asymmetries in B0s→J/ψK0S. Journal of High Energy Physics, 2015, 2015 (6), pp.131. ⟨10.1007/JHEP06(2015)131⟩. ⟨in2p3-01135710⟩
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