The decays B+c→J/ψD+s and B+c→J/ψD*+s are observed for the first time using a dataset, corresponding to an integrated luminosity of 3 fb−1, collected by the LHCb experiment in proton-proton collisions at center-of-mass energies of s√=7 and 8 TeV. The statistical significance for both signals is in excess of 9 standard deviations. The following ratios of branching fractions are measured to be ℬ(B+c→J/ψD+s)/ℬ(B+c→J/ψπ+)=2.90±0.57±0.24, ℬ(B+c→J/ψD*+s)/ℬ(B+c→J/ψD+s)=2.37±0.56±0.10, where the first uncertainties are statistical and the second systematic. The mass of the B+c meson is measured to be mB+c=6276.28±1.44(stat)±0.36(syst) MeV/c2, using the B+c→J/ψD+s decay mode.
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Titolo: | Observation of B-c(+) -> J/ psi D-s(+) and B-c(+) -> J/ psi D-s*(+) decays |
Autori: | |
Data di pubblicazione: | 2013 |
Rivista: | |
Abstract: | The decays B+c→J/ψD+s and B+c→J/ψD*+s are observed for the first time using a dataset, corresponding to an integrated luminosity of 3 fb−1, collected by the LHCb experiment in proton-proton collisions at center-of-mass energies of s√=7 and 8 TeV. The statistical significance for both signals is in excess of 9 standard deviations. The following ratios of branching fractions are measured to be ℬ(B+c→J/ψD+s)/ℬ(B+c→J/ψπ+)=2.90±0.57±0.24, ℬ(B+c→J/ψD*+s)/ℬ(B+c→J/ψD+s)=2.37±0.56±0.10, where the first uncertainties are statistical and the second systematic. The mass of the B+c meson is measured to be mB+c=6276.28±1.44(stat)±0.36(syst) MeV/c2, using the B+c→J/ψD+s decay mode. |
Handle: | http://hdl.handle.net/11567/696025 |
Appare nelle tipologie: | 01.01 - Articolo su rivista |