Speaker
Riccardo Russo
(Universita e INFN Torino (IT))
Description
The measurement of heavy-flavour production cross sections in pp collisions at the LHC has provided a reference for heavy-ion studies and a test for perturbative QCD calculations. Moreover the LHC has started the Run 2 operations this year, and the study of D-meson production in pp collisions at $\sqrt{s}$=13 TeV could provide a measurement of heavy-flavour production cross section at an unprecedented energy. In p--Pb collisions, heavy-flavour measurements are essential to assess the effects due to the presence of a nucleus in the initial state, such as the modification of the parton densities and the $k_{\rm T}$-broadening resulting from multiple soft scatterings of the partons.
In this poster we will focus on D$^{+}$-meson measurements as a function of the multiplicity of charged particles produced in the collision. These measurements are sensitive to the interplay between hard and soft contributions to particle production in p--Pb collisions and, in particular, could give insight into the role of multi-parton interactions (MPI), i.e. several hard partonic interactions occurring in a single collision at high centre-of-mass energies. The measurement is performed in p--Pb collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV recorded with the ALICE detector in 2013. D$^{+}$ mesons are reconstructed in their hadronic $K^{-}\pi^{+}\pi^{+}$ decay channels in the central rapidity region, and their yields are measured in different multiplicity and $p_{\rm T}$ intervals.
The per-event yield of D$^{+}$ mesons in the different multiplicity intervals, normalized to its multiplicity-integrated value, and its evolution with $p_{\rm T}$ will be compared for pp and p--Pb collisions. The nuclear modification factor of D$^{+}$ mesons in p--Pb collisions, defined as the ratio of the D-meson yield in p--Pb and pp collisions scaled by the number of binary collisions $N_{\rm coll}$, will be discussed in terms of its event activity dependence.
| On behalf of collaboration: | ALICE |
|---|
Primary author
Riccardo Russo
(Universita e INFN Torino (IT))
