Measurement of CP Violation in B[0 over s] → ϕϕ decays
Author(s)Counts, Ian Thomas Hunt; Ilten, Philip James; Williams, Michael
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A measurement of the decay time-dependent CP-violating asymmetry in B[0 over s] → ϕϕ decays is presented, along with measurements of the T-odd triple-product asymmetries. In this decay channel, the CP-violating weak phase arises from the interference between B[0 over s]−[bar over B][0 over s] mixing and the loop-induced decay amplitude. Using a sample of proton-proton collision data corresponding to an integrated luminosity of 3.0 fb[superscript −1] collected with the LHCb detector, a signal yield of approximately 4000 B[0 over s] → ϕϕ decays is obtained. The CP-violating phase is measured to be ϕ[subscript s] = −0.17 ± 0.15(stat) ± 0.03(syst) rad. The triple-product asymmetries are measured to be A[subscript U] = −0.003 ± 0.017(stat) ± 0.006(syst) and A[subscript V] = −0.017 ± 0.017(stat) ± 0.006(syst). Results are consistent with the hypothesis of CP conservation.
DepartmentMassachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science
Physical Review D
American Physical Society
Aaij, R., B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, S. Akar, J. Albrecht, et al. “Measurement of CP Violation in B[0 over s] → ϕϕ Decays.” Phys. Rev. D 90, no. 5 (September 2014).
Final published version