The nuclear modification factor RAA of charm jets, identified by the presence of a D0 meson among the jet constituents, has been measured for the first time in Pb–Pb collisions at a centre-of-mass energy per nucleon pair TeV with the ALICE detector at the LHC. The D0 mesons and their charge conjugates are reconstructed from the hadronic decay D . Jets are reconstructed from D0-meson candidates and charged particles using the anti-kT algorithm with jet resolution parameter , in the jet transverse momentum (pT) range 5 50 GeV/c and pseudorapidity |ηch jet| < 0.6. A hint of reduced suppression in the charm-jet RAA is observed in comparison to inclusive jets in central Pb–Pb collisions with a significance of about 2σ in 20 50 GeV/c, suggesting the in-medium energy loss to depend on both the difference between quark and gluon coupling strength (Casimir colour-charge effect) and quark mass (dead-cone effect). The data are compared with model calculations that include mass effects in the in-medium energy loss. Several state-of-the-art models are consistent with the data, with the LIDO model providing the best description of the data in the common kinematic range of inclusive and D0-tagged jets, highlighting the role of mass effects in interpreting the results.

Investigating charm quark energy loss in medium with the nuclear modification factor of D -tagged jets

Barile, F.
Membro del Collaboration Group
;
Colella, D.
Membro del Collaboration Group
;
Colelli, A.
Membro del Collaboration Group
;
Di Bari, D.
Membro del Collaboration Group
;
Mazzilli, M.
Membro del Collaboration Group
;
Nicassio, N.
Membro del Collaboration Group
;
Volpe, G.
Membro del Collaboration Group
;
2026-01-01

Abstract

The nuclear modification factor RAA of charm jets, identified by the presence of a D0 meson among the jet constituents, has been measured for the first time in Pb–Pb collisions at a centre-of-mass energy per nucleon pair TeV with the ALICE detector at the LHC. The D0 mesons and their charge conjugates are reconstructed from the hadronic decay D . Jets are reconstructed from D0-meson candidates and charged particles using the anti-kT algorithm with jet resolution parameter , in the jet transverse momentum (pT) range 5 50 GeV/c and pseudorapidity |ηch jet| < 0.6. A hint of reduced suppression in the charm-jet RAA is observed in comparison to inclusive jets in central Pb–Pb collisions with a significance of about 2σ in 20 50 GeV/c, suggesting the in-medium energy loss to depend on both the difference between quark and gluon coupling strength (Casimir colour-charge effect) and quark mass (dead-cone effect). The data are compared with model calculations that include mass effects in the in-medium energy loss. Several state-of-the-art models are consistent with the data, with the LIDO model providing the best description of the data in the common kinematic range of inclusive and D0-tagged jets, highlighting the role of mass effects in interpreting the results.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11586/579768
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