Segnaliamo questo seminario in cui si presentano risultati di ALICE a cui il gruppo di Padova ha contributo in modo fondamentale.
========================================================
Measurements of the production of hadrons containing charm or beauty quarks in proton-proton collisions provide an important test of quantum chromodynamics calculations. They also set the reference for the respective measurements in heavy-ion collisions, where the formation and properties of the quark-gluon plasma are investigated.
The excellent particle identification, track and decay-vertex reconstruction capabilities of the ALICE experiment, together with machine-learning techniques for multi-class classification, are exploited to separate the signal of non-prompt D mesons (produced in beauty-hadron decays) from that of prompt D mesons (produced in the charm-quark fragmentation) and the combinatorial background. The machine-learning approach also permits us to improve the precision of the prompt D+ and D+s measurements and to extend their transverse-momentum reach down to 0 and 1 GeV/𝑐, respectively. These measurements allow us to investigate the production and hadronization of charm and beauty quarks in proton-proton collisions.
In this seminar, the most recent results of the ALICE Collaboration on the production of prompt and non-prompt D0, D+, and D+s mesons at midrapidity in proton--proton collisions at 𝑠√=5.02 TeV are presented. The fragmentation fraction to strange mesons divided by the one to non-strange mesons, 𝑓s/(𝑓u+𝑓d), is reported for charm and beauty quarks. The measured bb¯ production cross section at midrapidity per unit of rapidity is compared to FONLL calculations and the recent and more accurate NNLO calculations.
ALICE Collaboration, arXiv:2102.13601
The event is a LHC seminar : https://indico.cern.ch/event/976689/
Michelangelo Mangano, Monica Pepe-Altarelli and Pedro Silva.
