A measurement of the ratio of the branching fractions of the B0s meson to J/ψ f0 (980) and to J/ψ φ (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− − 974 MeV| < 50 MeV and |MK+K− − 1020 MeV| < 10 MeV. The analysis is based on a data sample of pp collisions at a centre- of-mass energy of 7 TeV, collected by the CMS experiment at the LHC, corresponding to an integrated luminosity of 5.3 fb. The measured ratio is B(B0s →J/ψ f0) 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.
Measurement of the ratio B(Bs0 → J/ψf 0(980)) / B(Bs0 → J/ψ φ(1020)) in pp collisions at √s=7 TeV
SOLA, VALENTINA;AMAPANE, Nicola Carlo;ARGIRO', Stefano;BELLAN, Riccardo;COSTA, Marco;COVARELLI, Roberto;MIGLIORE, Ernesto;MONACO, Vincenzo;OBERTINO, Maria Margherita;PACHER, LUCA;PELLICCIONI, Mario;PINNA ANGIONI, GIAN LUCA;ROMERO, Alessandra;SACCHI, Roberto;SOLANO, Ada Maria;
2016-01-01
Abstract
A measurement of the ratio of the branching fractions of the B0s meson to J/ψ f0 (980) and to J/ψ φ (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− − 974 MeV| < 50 MeV and |MK+K− − 1020 MeV| < 10 MeV. The analysis is based on a data sample of pp collisions at a centre- of-mass energy of 7 TeV, collected by the CMS experiment at the LHC, corresponding to an integrated luminosity of 5.3 fb. The measured ratio is B(B0s →J/ψ f0) 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.File | Dimensione | Formato | |
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