Measurement of the time-dependent CP asymmetries in B[0 over s] → J/ψK[0 over S]
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Aaij-2015-Measurement of the t.pdf
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Author(s)
Counts, Ian Thomas Hunt
Williams, Michael
Ilten, Philip J
Date Issued
June 2015
Journal
Journal of High Energy Physics
Publisher
Springer-Verlag
Citation
Aaij, R., B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, S. Akar, J. Albrecht, et al. “Measurement of the Time-Dependent CP Asymmetries in B[0 over s] → J/ψK[0 over S].” J. High Energ. Phys. 2015, no. 6 (June 2015). © 2015 CERN, for the benefit of the LHCb Collaboration
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Final published version
Abstract
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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1007/jhep06(2015)131
