Segnaliamo questo seminario in cui si presentano risultati di ALICE a cui il gruppo di Padova ha contributo in modo fondamentale.
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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/๐, 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 ๐ โ=5.02 TeV are presented. The fragmentation fraction to strange mesons divided by the one to non-strange mesons, ๐s/(๐u+๐d), is reported for charm and beauty quarks. The measured bbยฏ 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.