Speaker
Description
Measurements of the production of hadrons containing beauty quarks
in pp and p--Pb collisions provide an important test of quantum chromodynamics calculations as well as the possibility to investigate fragmentation mechanims and modifications of the PDF in nuclei.
The use of machine-learning techniques for multi-class classification, coupled with the excellent particle identification, track and decay-vertex reconstruction capabilities of the ALICE experiment, is exploited to separate the non-prompt and prompt D mesons and $\Lambda_{\rm c}$ baryons, respectively produced in beauty-hadron decays and directly from the charm-quark fragmentation. The same technique also allows for the first time the measurement of the non-prompt ${\rm D}^{*}$ polarization and the analysis of the non-prompt D-meson fractions as a function of multiplicity in pp collisions at $\sqrt{s}=13$ TeV.
The beauty production is also investigated via the measurements of b-tagged jets in pp and p–-Pb collisions at $\sqrt{s_{\rm NN}}=5.02$ TeV. The final results will be presented. The nuclear modification factor $R_{\rm pPb}$ is found consistent with unity and the fraction of b-jets among inclusive jets down to $p_{\rm T}=10$ GeV/${\it c}$ is found lower than in previous measurements of b-jets done at the LHC. The measurements of the b$\bar{\rm b}$ production cross section at midrapidity are compared to FONLL predictions and to NNLO calculations.
| Submitted on behalf of a Collaboration? | Yes |
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