engleski

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

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/cc at midrapidity (|y| < 0.5∣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 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 away-side 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.

p p: scattering ; charm: production ; D: direct production ; charged particle: multiplicity ; heavy quark: angular correlation ; transverse momentum ; fragmentation ; Monte Carlo ; ALICE ; CERN LHC Coll ; correlation function ; rapidity ; correlation ; hadronization ; experimental results ; 13000 GeV-cms/nucleon

nije evidentirano