Measurement of the time-dependent CP asymmetries in B[0 over s] → J/ψK[0 over S]

• Main Authors: Counts, Ian Thomas Hunt (Contributor), Ilten, Philip James (Contributor), Williams, Michael (Contributor)
• Other Authors: Massachusetts Institute of Technology. Department of Physics (Contributor), Massachusetts Institute of Technology. Laboratory for Nuclear Science (Contributor)
• Format: Article
• Language: English
• Published: Springer-Verlag, 2015-08-26T12:47:53Z.
• Subjects: Article
• Online Access: Get fulltext

 The first measurement of decay-time-dependent CP asymmetries in the decay B[0 over s] → J/ψK[0 over S] and an updated measurement of the ratio of branching fractions B(B[0 over s] → J/ψK[0 over S])/B(B[superscript 0] → J/ψK[0 over S]) are presented. The results are obtained using data corresponding to an integrated luminosity of 3.0 fb[superscript −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[subscript ΔΓ](B[0 over s] → J/ψK[0 over S]) = 0.49 ± [0.77 over 0.65](stat) ± 0.06(syst), C[subscript dir](B[0 over s] → J/ψK[0 over S]) = −0.28 ± 0.41(stat) ± 0.08(syst), S[subscript mix](B[0 over s] → J/ψK[0 over S]) = −0.08 ± 0.40(stat) ± 0.08(syst). The ratio B(B[0 over s] → J/ψK[0 over S])/B(B[superscript 0] → J/ψK[0 over S]) is measured to be 0.0431 ± 0.0017(stat) ± 0.0012(syst) ± 0.0025(f[subscript s]/f[subscript d]), where the last uncertainty is due to the knowledge of the B[0 over s] and B[superscript 0] production fractions.