Measurement of B meson production cross-sections in proton-proton collisions at $\sqrt{s}=7$ TeV

Abstract

The production cross-sections of B mesons are measured in pp collisions at a centre-of-mass energy of 7 TeV, using data collected with the LHCb detector corresponding to a integrated luminosity of 0.36 fb⁻¹. The B ⁺, B ⁰ and $B_s^0$ mesons are reconstructed in the exclusive decays B ⁺ → J/ψK ⁺, B ⁰ → J/ψK ^*0 and $B_s^0\to {J \left/ {{\psi \phi }} \right.}$, with J/ψ → μ ⁺ μ ⁻, K ^*0 → K ⁺π⁻ and ϕ → K ⁺ K ⁻. The differential cross-sections are measured as functions of B meson transverse momentum p _T and rapidity y, in the range 0 < p _T < 40 GeV/c and 2.0 < y < 4.5. The integrated cross-sections in the same p _T and y ranges, including charge-conjugate states, are measured to be

$ \begin{array}{*{20}{c}} {\sigma \left( {pp\to {B^{+}}+X} \right)=38.9\pm 0.3\left( {\mathrm{stat}.} \right)\pm 2.5\left( {\mathrm{syst}.} \right)\pm 1.3\left( {\mathrm{norm}.} \right)\upmu \mathrm{b},} \hfill \\ {\sigma \left( {pp\to {B^0}+X} \right)=38.1\pm 0.6\left( {\mathrm{stat}.} \right)\pm 3.7\left( {\mathrm{syst}.} \right)\pm 4.7\left( {\mathrm{norm}.} \right)\upmu \mathrm{b},} \hfill \\ {\sigma \left( {pp\to B_s^0+X} \right)=10.5\pm 0.2\left( {\mathrm{stat}.} \right)\pm 0.8\left( {\mathrm{syst}.} \right)\pm 1.0\left( {\mathrm{norm}.} \right)\upmu \mathrm{b},} \hfill \\ \end{array} $

where the third uncertainty arises from the pre-existing branching fraction measurements.