A measurement of the ratio of the branching fractions of the B0s meson to J/ψf0(980) and to J/ψφ(1020) is presented. The J/ψ, f0(980), and φ(1020) are observed through their decays to μ+μ−, π+π−, and K+K−, respectively. The f0 and the φ are identified by requiring |Mπ+π− − 974MeV| <50MeV and |MK+K− − 1020 MeV| <10MeV. The analysis is based on a data sample of pp collisions at a centre-of-mass energy of 7TeV, collected by the CMS experiment at the LHC, corresponding to an integrated luminosity of 5.3fb−1. The measured ratio is B(B0s→J/ψf0)B(f0→π+π−) / B(B0s→J/ψφ)B(φ→K+K−) = 0.140 ±0.008 (stat) ±0.023 (syst), where the first uncertainty is statistical and the second is systematic.
- Angle γ
- CP violation