Observation of B[+ over c] → J/ψD[+ over s] and B[+ over c] → J/ψD[* over s][superscript +] decays
The decays B[+ over c] → J/ψD[+ over s] and B[+ over c] → J/ψD[*+ over s] are observed for the first time using a dataset, corresponding to an integrated luminosity of 3 fb[superscript −1], collected by the LHCb experiment in proton-proton collisions at center-of-mass energies of √s = 7 and 8 TeV....
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| Format: | Article |
| Language: | en_US |
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American Physical Society
2015
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| Online Access: | http://hdl.handle.net/1721.1/97448 https://orcid.org/0000-0001-8285-3346 |
| Summary: | The decays B[+ over c] → J/ψD[+ over s] and B[+ over c] → J/ψD[*+ over s] are observed for the first time using a dataset, corresponding to an integrated luminosity of 3 fb[superscript −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[+ over c] → J/ψD[+over s]) over B(B[+ over c] → J/ψπ[superscript +])] = 2.90 ± 0.57 ± 0.24, [B(B[+ over c] → J/ψD[*+ over s]) over B(B[+ over c] → J/ψD[+ over s]) = 2.37 ± 0.56 ± 0.10, where the first uncertainties are statistical and the second systematic. The mass of the B[+ over c] meson is measured to be m[subscript B[+ over c]] = 6276.28 ± 1.44(stat) ± 0.36(syst) MeV/c[superscript 2], using the B[+ over c] → J/ψD[+ over s] decay mode. |
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