Speaker
Description
Heavy charm and beauty quarks are sensitive probes to study the Quark-Gluon Plasma produced in high-energy heavy-ion collisions. Because of their large masses, they are produced in the initial stage of the collision and therefore explore the entire evolution of the produced medium. ALICE, A Large Ion Collider Experiment located at the Large Hadron Collider at CERN, is a dedicated experiment for heavy-ion collisions. Besides Pb-Pb and p-Pb collisions, ALICE also studies heavy-flavour production in pp collisions.
The measurements of heavy-flavour production in pp collisions are an important test for perturbative QCD calculations. At low $p_{\rm T}$, where the theoretical uncertainties are still relatively large, heavy-flavour production is dominated by low-$x$ gluons, so measurements in this region can provide necessary constraints on the pQCD calculations. Measurements in pp collisions are also essential as baseline for heavy-ion analyses. For example the nuclear modification factor $R_{AA}$, which measures the effect of in-medium energy loss, uses the proton-proton reference measurement.
In this talk, the status of open charm meson and baryon production measurements in pp collisions at $\sqrt{s} =$ 5.02, 7, 8 and 13 TeV with the ALICE experiment during LHC Run-1 and Run-2 will be presented. These results will include the production cross section of $\rm D$ mesons at all three energies, multiplicity measurements at $\sqrt{s} =$ 7 TeV and the measurements of the baryons $\Lambda_{c}$ and $\Xi_{c}$ at $\sqrt{s} =$ 7 TeV. Comparisons with theoretical model predictions will be shown.
