Orateur
Description
The transverse momentum (pT) differential production cross section of the promptly-produced charm-strange baryon Ξ0c is measured at midrapidity via its hadronic decay into π+Ξ− in p–Pb collisions at sqr(sNN) = 5.02 TeV with the ALICE detector at the LHC. The Ξ0c nuclear modification factor (RpPb), calculated from the cross sections in pp and p–Pb collisions, is presented and compared with the RpPb of Λ+c baryons. The ratios between the pT-differential production cross section of Ξ0c baryons and those of D0 mesons and Λ+c baryons are also reported and compared with results from the LHCb Collaboration. The measurements are compared with a model based on perturbative QCD calculations of charm quark production cross sections including only cold nuclear matter effects in p–Pb collisions, which underestimates the measurement by a factor of about 50. This discrepancy is reduced when the data is compared with a model in which hadronisation is implemented via quark coalescence. The pT-integrated cross section of prompt Ξ0c-baryon production at midrapidity is also reported. These results provide important inputs for the calculation of the charm production cross section in p–Pb collisions at midrapidity.
