Heavy-Flavour Measurements in p-Pb Collisions with ALICE at the LHC

摘要

74.1 Introduction Heavy quarks (charm and beauty) due to their large masses are predominantly produced in hard-scattering processes in the initial phase of hadronic collisions. Therefore, they are excellent probes to study the properties of the Quark-Gluon Plasma created in relativistic heavy-ion collisions. The measurement of their production in p-Pb collisions is important to disentangle the hot nuclear matter effects present in heavy-ion collisions from cold nuclear matter (CNM) effects, such as transverse momentum broadening, nuclear modification of the parton distribution functions, initial-state multiple scatterings and energy loss. These effects can be investigated by measuring the nuclear modification factor R_(pPb), defined as the ratio of particle cross section dσ/dp_T measured in p-Pb collisions to that measured in pp collisions scaled by the atomic mass number of Pb nuclei. In the absence of CNM effects R_pPb is expected to be unity. The R_pPb of D mesons and leptons from charm and beauty hadron decays at central and forward rapidities was studied in p-Pb collisions at {formula}=5.02 TeV with ALICE.