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 root s = 13 TeV with the ALICE detector is reported, considering D-0, D+, and D*(+) mesons in the transverse-momentum interval 3 < p(T) < 36 GeV/c at midrapidity (vertical bar y vertical bar < 0.5), and charged particles with p(T) > 0.3 GeV/c and pseudorapidity vertical bar eta vertical bar < 0.8. This measurement has an improved precision and provides an extended transverse-momentum coverage compared to previous ALICE measurements at lower energies. The study is also performed as a function of the charged-particle multiplicity, showing no modifications of the correlation function with multiplicity within uncertainties. The properties and the transverse-momentum evolution of the near- and awayside correlation peaks are studied and compared with predictions from various Monte Carlo event generators. Among those considered, PYTHIA8 and POWHEG+PYTHIA8 provide 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 root s=13 TeV

Alessandro, B.;Alici, A.;Angeletti, M.;Aziz, S.;Banerjee, D.;Baruffaldi, F.;Basu, S.;Bearden, I. G.;Bellini, F.;Biswas, S.;Bruno, G. E.;Colella, D.;Contin, G.;Das, P.;Dash, S.;De Falco, A.;Deb, S.;Evans, D.;Faggin, M.;Faivre, J.;Ghosh, P.;Giacalone, M.;Giubilato, P.;Harris, J. W.;Janik, M. A.;Jung, J.;Kim, J. S.;Kundu, S.;Lunardon, M.
Membro del Collaboration Group
;
Margotti, A.;Martinez M.;Micheletti, L.;Pagano, D.;Rehman, A.;Richter, M.;Riggi, F.;Rotondi, A.;Roy, A.;Rui, R.;Sharma, A.;Sinha, T.;Soramel, F.;Stocco, D.;Swain, S.;Szarka, I;Terrevoli, C.;Thomas, D.;Trogolo, S.;Turrisi, R.;Uras, A.;Vercellin, E.;Wagner, B.;Wang, C.;Wright, J. R.;Wu, W.;Zhou, Y.;Zhu, J.;
2022

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 root s = 13 TeV with the ALICE detector is reported, considering D-0, D+, and D*(+) mesons in the transverse-momentum interval 3 < p(T) < 36 GeV/c at midrapidity (vertical bar y vertical bar < 0.5), and charged particles with p(T) > 0.3 GeV/c and pseudorapidity vertical bar eta vertical bar < 0.8. This measurement has an improved precision and provides an extended transverse-momentum coverage compared to previous ALICE measurements at lower energies. The study is also performed as a function of the charged-particle multiplicity, showing no modifications of the correlation function with multiplicity within uncertainties. The properties and the transverse-momentum evolution of the near- and awayside correlation peaks are studied and compared with predictions from various Monte Carlo event generators. Among those considered, PYTHIA8 and POWHEG+PYTHIA8 provide the best description of the measured observables. The obtained results can provide guidance on tuning the generators.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11577/3468230
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