# Measurements of $B_c^+$ production and mass with the $B_c^+ \to J/\psi \pi^+$ decay

Abstract : 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/$c^2$.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00735611
Contributor : Sabine Starita <>
Submitted on : Wednesday, September 26, 2012 - 11:15:15 AM
Last modification on : Tuesday, April 20, 2021 - 12:00:10 PM

### Citation

R. Aaij, S. Barsuk, O. Callot, J. He, B. Jean-Marie, et al.. Measurements of $B_c^+$ production and mass with the $B_c^+ \to J/\psi \pi^+$ decay. Physical Review Letters, American Physical Society, 2012, 109, pp.232001. ⟨10.1103/PhysRevLett.109.232001⟩. ⟨in2p3-00735611⟩

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