First observation of the decay Bc+ to J/psi pi+pi-pi+

03/2012; DOI: 10.1103/PhysRevLett.108.251802
Source: arXiv


The decay Bc+ --> J/psi pi+pi-pi+ is observed for the first time, using 0.8
fb-1 of pp collisions at sqrt{s}=7 TeV collected by the LHCb experiment. The
ratio of branching fractions BR(Bc+ --> J/psi pi+pi-pi+)/BR(B_c+ --> J/psi pi+)
is measured to be 2.41+-0.30+-0.33, where the first uncertainty is statistical
and the second systematic. The result is in agreement with theoretical

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