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B.Zucchelli, S.2018-12-192018-12-192018-12-192018-11-2910.1103/PhysRevLett.121.222001https://infoscience.epfl.ch/handle/20.500.14299/153102WOS:000451582500005The 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 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 GeV/c, represent the first direct determination of the antiproton production cross section in p-He collisions, and impact the interpretation of recent results on antiproton cosmic rays from space-borne experiments.Physics, MultidisciplinaryPhysicscosmic-ray antiprotonsantimattertext::journal::journal article::research article