Angular correlations of heavy-flavour and charged particles in high-energy proton–proton collisions are sensitive to the production mechanisms of heavy quarks and to their fragmentation as well as hadronisation processes. The measurement of the azimuthal-correlation function of prompt D mesons with charged particles in proton–proton collisions at a centre-of-mass energy of √s = 13 TeV with the ALICE detector is reported, considering D0, D+, and D∗+ mesons in the transverse-momentum interval 3 < pT < 36 GeV/c at midrapidity (|y| < 0.5), and charged particles with pT > 0.3 GeV/c and pseudorapidity |η| < 0.8. This measurement has an improved precision and provides an extended transverse-momentum coverage compared to pre- vious ALICE measurements at lower energies. The study is also performed as a function of the charged-particle mul- tiplicity, showing no modifications of the correlation func- tion with multiplicity within uncertainties. The properties and the transverse-momentum evolution of the near- and away- side correlation peaks are studied and compared with pre- dictions from various Monte Carlo event generators. Among those considered, PYTHIA8 and POWHEG+PYTHIA8 pro- vide the best description of the measured observables. The obtained results can provide guidance on tuning the generators.

Investigating charm production and fragmentation via azimuthal correlations of prompt D mesons with charged particles in pp collisions at √s = 13 TeV

M. D. Buckland;P. Camerini;G. Contin;C. De Martin;M. Faggin;E. Fragiacomo;G. Luparello;G. V. Margagliotti;S. Piano;R. Rui;V. Zaccolo;
2022-01-01

Abstract

Angular correlations of heavy-flavour and charged particles in high-energy proton–proton collisions are sensitive to the production mechanisms of heavy quarks and to their fragmentation as well as hadronisation processes. The measurement of the azimuthal-correlation function of prompt D mesons with charged particles in proton–proton collisions at a centre-of-mass energy of √s = 13 TeV with the ALICE detector is reported, considering D0, D+, and D∗+ mesons in the transverse-momentum interval 3 < pT < 36 GeV/c at midrapidity (|y| < 0.5), and charged particles with pT > 0.3 GeV/c and pseudorapidity |η| < 0.8. This measurement has an improved precision and provides an extended transverse-momentum coverage compared to pre- vious ALICE measurements at lower energies. The study is also performed as a function of the charged-particle mul- tiplicity, showing no modifications of the correlation func- tion with multiplicity within uncertainties. The properties and the transverse-momentum evolution of the near- and away- side correlation peaks are studied and compared with pre- dictions from various Monte Carlo event generators. Among those considered, PYTHIA8 and POWHEG+PYTHIA8 pro- vide the best description of the measured observables. The obtained results can provide guidance on tuning the generators.
2022
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https://link.springer.com/article/10.1140/epjc/s10052-022-10267-3
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/3038500
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