Production asymmetries of $D^{\pm}$, $Λ_c^{+}/Λ_c^{-}$ and $Λ_b^0/\overlineΛ_b^0$ at the LHC from heavy quark recombination mechanism

Abstract

The asymmetry in the forward region production cross section of $D^{\pm}$ is calculated using the heavy quark recombination mechanism for $pp$ collisions at $7$~TeV. By suitable choices of four nonperturbative parameters, our calculated results can reproduce those obtained at LHCb. We find $A_p\sim-1\%$ when integrated over $2.0\textrm{ GeV}<p_T<18\textrm{ GeV}$ and $2.2<η<4.75$, which agrees with $A_p=-0.96\pm0.26\pm0.18\%$ as measured by LHCb. Furthermore, the calculated distributions in $η$ and $p_T$ agree reasonably well with those obtained at LHCb. Using the heavy quark recombination mechanism, we also make predictions on the production asymmetries of $Λ_c^{+}/Λ_c^{-}$ and $Λ_b^0/\overlineΛ_b^0$ for $pp$ collisions at $7$~TeV and $14$~TeV in the forward region. We find that the integrated asymmetries for these $Λ$ baryons in the LHCb region are of the order of $\sim1-3\%$ and should be measurable.