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 $(0.68\pm 0.10(stat.)\pm 0.03(syst.)\pm 0.05(\mathrm{lifetime}))$% for $B_c^{+}$ and $B^{+}$ mesons with transverse momenta $p_{\mathrm{T}}>4$GeV/$c$ and pseudorapidities $2.5<\eta <4.5$. The $B_c^{+}$ mass is directly measured to be $6273.7\pm 1.3(stat.)\pm 1.6(syst.)$ MeV/$c^2$, and the measured mass difference with respect to the $B^{+}$ meson is $M(B_c^{+})-M(B^{+})=994.6\pm 1.3(stat.)\pm 0.6(syst.)$ MeV/$c^2$.

14 pages including author list, 3 figures. v3, corrected the eaten "%" in the production ratio, only affects the arXiv abstract

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• Measurement of b-hadron masses
• Measurement of the B^0_s - \bar{B}^0_s oscillation frequency Delta m_s in B^0_s -> D_s^-(3) pi decays
• Measurement of the lifetime of the B_c meson in the semileptonic decay channel
• Measurements of the branching fractions and CP asymmetries of B+ to J/psi pi+ and B+ to psi(2S) pi+ decays

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