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First observation of the decay B+c→J/ψK+
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LHCb Collaboration (Including: Back, J. J., Craik, Daniel, Dossett, D., Gershon, T. J., Kreps, Michal, Latham, Thomas, Pilar, T., Poluektov, Anton, Reid, Matthew M., Silva Coutinho, R., Whitehead, M. (Mark) and Williams, M. P.). (2013) First observation of the decay B+c→J/ψK+. Journal of High Energy Physics, Volume 2013 (Issue 9). Article number 75. doi:10.1007/JHEP09(2013)075 ISSN 1029-8479.
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WRAP_LHCb_art%3A10.1007%2FJHEP09%282013%29075.pdf - Published Version Available under License Creative Commons Attribution. Download (854Kb) | Preview |
Official URL: http://dx.doi.org/10.1007/JHEP09(2013)075
Abstract
The decay B+c→J/ψK+ is observed for the first time using a data sample, corresponding to an integrated luminosity of 1.0 fb−1, collected by the LHCb experiment in pp collisions at a centre-of-mass energy of 7 TeV. A yield of 46 ± 12 events is reported, with a significance of 5.0 standard deviations. The ratio of the branching fraction of B+c→J/ψK+ to that of B+c→J/ψπ+ is measured to be 0.069 ± 0.019 ± 0.005, where the first uncertainty is statistical and the second is systematic.
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