# Measurement of Antiproton Production in $p\text{−}\mathrm{He}$ Collisions at $\sqrt{{s}_{\mathrm{NN}}}=110\text{}\text{}\mathrm{GeV}$

03 December 2018

Abstract: The cross section for prompt antiproton production in collisions of protons with an energy of 6.5 TeV incident on helium nuclei at rest is measured with the LHCb experiment from a data set corresponding to an integrated luminosity of $0.5\text{}\text{}{\mathrm{nb}}^{-1}$. The target is provided by injecting helium gas into the LHC beam line at the LHCb interaction point. The reported results, covering antiproton momenta between 12 and $110\text{}\text{}\mathrm{GeV}/c$, represent the first direct determination of the antiproton production cross section in $p\text{−}\mathrm{He}$ collisions, and impact the interpretation of recent results on antiproton cosmic rays from space-borne experiments.

Published in: Physical Review Letters 121 (2018)