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.
