UNSPECIFIED (2014) Flavor tagged time-dependent angular analysis of the B0s→J/ψϕ decay and extraction of ΔΓs and the weak phase ϕs in ATLAS. Physical Review D, 90 (5): 052007. ISSN 1550-7998
PhysRevD.90.052007.pdf - Published Version
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Abstract
A measurement of the B0s→J/ψϕ decay parameters, updated to include flavor tagging is reported using 4.9 fb−1 of integrated luminosity collected by the ATLAS detector from s√=7 TeV pp collisions recorded in 2011 at the LHC. The values measured for the physical parameters are ϕs0.12±0.25(stat)±0.05(syst) radΔΓs0.053±0.021(stat)±0.010(syst) ps−1Γs0.677±0.007(stat)±0.004(syst) ps−1|A∥(0)|20.220±0.008(stat)±0.009(syst)|A0(0)|20.529±0.006(stat)±0.012(syst)δ⊥=3.89±0.47(stat)±0.11(syst) rad where the parameter ΔΓs is constrained to be positive. The S-wave contribution was measured and found to be compatible with zero. Results for ϕs and ΔΓs are also presented as 68% and 95% likelihood contours, which show agreement with the Standard Model expectations.