Speaker
Mr
Syaefudin Jaelani
(Utrecht University)
Description
Heavy quarks (charm and beauty) are produced in hard scattering processes at the early stage of the collision. Charmed-hadron production in small systems is important to test perturbative QCD calculations, to understand cold nuclear matter effects and to test possible collective effects. In addition their abundance is preserved during the subsequent collision stages making them effective probes for the hot and dense QCD medium (QGP) produced in heavy-ion collisions. The measurement of charmed-baryon production, and in particular of the charmed baryon-to-meson ratio ($\Lambda_\mathrm{c}^{+}/\mathrm{D}^{0}$), is sensitive to the charm hadronisation mechanism, which is a non-perturbative process. Moreover the measurements of heavier charmed baryons, for example $\mathrm{\Xi_c^0}$, can be used to quantify the hadronisation of charm quarks into different hadron species. Furthermore, the measurements of charm hadrons in pp and p--Pb collisions constitute the necessary reference for measurements in Pb--Pb collisions.
In this talk, the recent measurements of open heavy flavours in pp and p--Pb collisions performed with the ALICE detector will be presented. These results include the $p_\mathrm{T}$-differential production cross-section of non-strange D mesons ($\mathrm D^{0}$, $\mathrm D^{*+}$ and $ \mathrm D^{+}$) and of the $\mathrm D_{\mathrm s}^{+}$ meson, and their nuclear modification factor in p--Pb collisions. We also present the recent measurements of the $p_\mathrm{T}$-differential cross section of the $\Lambda_{c}^+$ baryon at mid-rapidity in pp collisions at $\sqrt{s} = 7$ TeV and in p--Pb collisions at $\sqrt{s_{\mathrm{NN}}} = 5.02$ TeV. In addition, the first measurement of $\mathrm{\Xi_c^0}$--baryon production in the decay channel $\mathrm{\Xi_c^0 \to e^{+} \Xi^- \nu_e}$ in pp collisions at $\sqrt{s} = 7$ TeV at the LHC will be presented.
Primary author
Mr
Syaefudin Jaelani
(Utrecht University)
