Measurement of $B^0$, $B_s^0$, $B^{+}$ and ${\mathrm{\Lambda }}_b^0$ production asymmetries in 7 and 8 TeV proton-proton collisions

The $B^0$, $B_s^0$, $B^{+}$ and ${\mathrm{\Lambda }}_b^0$ hadron production asymmetries are measured using a data sample corresponding to an integrated luminosity of 3.0 fb${}^{-1}$, collected by the LHCb experiment in proton-proton collisions at centre-of-mass energies of 7 and 8 TeV. The measurements are performed as a function of transverse momentum and rapidity of the $b$ hadrons within the LHCb detector acceptance. The overall production asymmetries, integrated over transverse momentum and rapidity, are also determined.