The first measurement of heavy-flavor production by the LHCb experiment in its fixed-target mode is presented. The production of J/ψ and D0 mesons is studied with beams of protons of different energies colliding with gaseous targets of helium and argon with nucleon-nucleon center-of-mass energies of √sNN = 86.6 and 110.4 GeV, respectively. The J/ψ and D0 production cross sections in pHe collisions in the rapidity range [2, 4.6]are found to be σJ/ψ = 652 ± 33 (stat) ± 42 (syst) nb/nucleon and σD0 = 80.8 ± 2.4 ( stat ) ± 6.3 (syst) μb/nucleon, where the first uncertainty is statistical and the second is systematic. No evidence for a substantial intrinsic charm content of the nucleon is observed in the large Bjorken- x region.
ASJC Scopus subject areas
- Physics and Astronomy(all)