Measurement of B meson production cross-sections in proton-proton collisions at √s=7 TeV

A bstract 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 Bₛ⁰ mesons are reconstructed in the exclusive decays B + → J / ψK + , B 0 → J / ψK *0 and Bₛ⁰→ J / ψ φ . , 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 $ {array}{*{20}{c}} {σ ( {pp→ {B⁺}+X} )=38.9± 0.3( {stat.} )± 2.5( {syst.} )± 1.3( {norm.} ) b,} \\ {σ ( {pp→ {B^0}+X} )=38.1± 0.6( {stat.} )± 3.7( {syst.} )± 4.7( {norm.} ) b,} \\ {σ ( {pp→ B_s^0+X} )=10.5± 0.2( {stat.} )± 0.8( {syst.} )± 1.0( {norm.} ) b,} \\ {array} $ where the third uncertainty arises from the pre-existing branching fraction measurements.