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The difference in the angular distributions between beauty quarks andantiquarks, referred to as the charge asymmetry, is measured for the first timein $b\bar{b}$ pair production at a hadron collider. The data used correspond toan integrated luminosity of 1.0fb$^{-1}$ collected at 7TeV center-of-massenergy in proton-proton collisions with the LHCb detector. The measurement isperformed in three regions of the invariant mass of the $b\bar{b}$ system. Theresults obtained are: \begin{eqnarray}  A_{C}^{b\bar{b}}(40 < M_{b\bar{b}} < 75\,\rm{GeV/c^2}) &=& 0.4 \pm0.4(\rm{stat}) \pm 0.3(\rm{syst})\%\newline  A_{C}^{b\bar{b}}(75 < M_{b\bar{b}} < 105\,\rm{GeV/c^2}) &=& 2.0 \pm0.9(\rm{stat}) \pm 0.6(\rm{syst})\%\newline  A_{C}^{b\bar{b}}(M_{b\bar{b}} > 105\,\rm{GeV/c^2}) &=&1.6 \pm 1.7(\rm{stat})\pm 0.6(\rm{syst})\% \end{eqnarray} where $A_{C}^{b\bar{b}}$ is defined as theasymmetry in the difference in rapidity between jets formed from the beautyquark and antiquark. The beauty jets are required to satisfy $2<\eta<4$,$E_{\rm T} > 20$GeV, and have an opening angle in the transverse plane$\Delta\phi>2.6$rad. These measurements are consistent with the predictions ofthe Standard Model.

First measurement of the charge asymmetry in beauty-quark pair production at a hadron collider