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Physical Review Letters 109 (2012) 232001
Measurements of $B_c^+$ production and mass with the $B_c^+ \to J/\psi \pi^+$ decay
R. Aaij, S. Barsuk1, O. Callot1, J. He1, B. Jean-Marie1, J. Lefrançois1, F. Machefert1, A. Martin Sanchez1, M. Nicol1, P. Robbe1, M.-H. Schune1, B. Viaud1, I. Videau1, E. Ben-Haim2, M. Benayoun2, P. David2, L. Del Buono2, A. Martens2, Z J Ajaltouni3, E. Cogneras3, O. Deschamps3, I. El Rifai3, P. Henrard3, M. Hoballah3, M. Jahjah Hussein3, R. Lefèvre3, L. Li Gioi3, S. Monteil3, V. Niess3, Pascal Perret3, D. Roa Romero3, K. Sobczak3, C. Adrover4, E. Aslanides4, J. Cogan4, R. Legac4, O. Leroy4, G. Mancinelli4, E. Maurice4, M. Perrin-Terrin4, M. Sapunov4, J. Serrano4, A. Tsaregorodtsev4, I. De Bonis5, D. Decamp5, Ph. Ghez5, P. Hopchev5, J.-P. Lees5, I.V. Machikhiliyan5, M.-N. Minard5, B. Pietrzyk5, S. T'Jampens5, V. Tisserand5, E. Tournefier5
For the LHCb collaboration(s)
(2012)

Measurements of $B_c^+$ production and mass are performed with the decay mode $B_c^+ \to J/\psi \pi^+$ using 0.37 fb$^{-1}$ of data collected in $pp$ collisions at $\sqrt{s}=7$ TeV by the LHCb experiment. The ratio of the production cross-section times branching fraction between the $B_c^+ \to J/\psi \pi^+$ and the $B^+ \to J/\psi K^+$ decays is measured to be $(0.68 \pm 0.10\,({\rm stat.}) \pm 0.03\,({\rm syst.}) \pm 0.05\,({\rm lifetime}))%$ for $B_c^+$ and $B^+$ mesons with transverse momenta $p_{\rm T}>4 $GeV/$c$ and pseudorapidities $2.5<\eta<4.5$. The $B_c^+$ mass is directly measured to be $6273.7 \pm 1.3\,({\rm stat.}) \pm 1.6 \,({\rm syst.})$ MeV/$c^2$, and the measured mass difference with respect to the $B^+$ meson is $M(B_c^+)-M(B^+) = 994.6 \pm 1.3\,({\rm stat.}) \pm 0.6\,({\rm syst.})$ MeV/$c^2$.
1:  LAL - Laboratoire de l'Accélérateur Linéaire
2:  LPNHE - Laboratoire de Physique Nucléaire et de Hautes Énergies
3:  LPC - Laboratoire de Physique Corpusculaire [Clermont-Ferrand]
4:  CPPM - Centre de Physique des Particules de Marseille
5:  LAPP - Laboratoire d'Annecy le Vieux de Physique des Particules
Physics/High Energy Physics - Experiment
Fulltext link: 
http://fr.arXiv.org/abs/1209.5634