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Abstract |
The first observation of the B-c(+) -> J/psi pi(+)pi(0) decay is reported with high significance using proton-proton collision data, corresponding to an integrated luminosity of 9 fb(-1), collected with the LHCb detector at centre-of-mass energies of 7, 8, and 13TeV. The ratio of its branching fraction relative to the B-c(+) -> J/psi pi(+) channel is measured to be BBc+ -> J/psi pi+pi 0/BBc+ -> J/psi pi+ = 2.80 +/- 0.15 +/- 0.11 +/- 0.16, where the first uncertainty is statistical, the second systematic and the third related to imprecise knowledge of the branching fractions for B+ -> J/psi K*(+) and B-c(+) -> J/psi pi(+) decays, which are used to determine the pi(0) detection efficiency. The pi(+) pi(0) mass spectrum is found to be consistent with the dominance of an intermediate rho(+) contribution in accordance with a model based on QCD factorisation. |
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Address |
[Egede, U.; Fujii, Y.; Hadavizadeh, T.; Henderson, R. D. L.; Lane, J. J.; Liu, F. L.; Monk, M.; Song, R.; Walton, E. J.; Ward, J. A.] Monash Univ, Sch Phys & Astron, Melbourne, Vic, Australia, Email: Ivan.Belyaev@cern.ch |
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