First observation of the decay Bc+→J/ψπ+π-π+
Back, J. J., Dossett, D., Gershon, T. J., Harrison, P. F., Kreps, Michal, Latham, Thomas, Pilar, T., Poluektov, Anton, Reid, Matthew M., Silva Coutinho, R., Whitehead, M. (Mark) and Williams, M. P. (2012) First observation of the decay Bc+→J/ψπ+π-π+. Physical Review Letters, Vol.108 (No.25). Article Number 251802 . ISSN 0031-9007
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Official URL: http://dx.doi.org/10.1103/PhysRevLett.108.251802
The decay Bc+→J/ψπ+π-π+ is observed for the first time, using 0.8 fb-1 of pp collisions at √s=7 TeV collected by the LHCb experiment. The ratio of branching fractions B(Bc+→J/ψπ+π-π+)/B(Bc+→J/ψπ+) is measured to be 2.41±0.30±0.33, where the first uncertainty is statistical and the second is systematic. The result is in agreement with theoretical predictions.
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