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

Abstract : 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.
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Contributor : Sabine Starita <>
Submitted on : Wednesday, March 25, 2015 - 5:15:41 PM
Last modification on : Tuesday, April 20, 2021 - 12:00:14 PM

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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, Springer, 2015, 2015 (6), pp.131. ⟨10.1007/JHEP06(2015)131⟩. ⟨in2p3-01135710⟩



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