- By:
- Bock, Friederike ; Schmidt, Nicolas V; Read Jr, Kenneth F; Jonas, Florian; Novitzky, Norbert ; Schambach, Joachim J; Fasel, Markus ; Poghosyan, Martin ; Loizides, Constantinos A; Glimos, Ewa
- Journal Name:
- Physics Letters B
- Page Number:
- 140299-140299
- Volume:
- 875
- Publication Date:
- June 10, 2026
- View DOI Listing:
- https://doi.org/10.1016/j.physletb.2026.140299
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 √ 𝑠NN = 5.02 TeV with the ALICE detector at the LHC. The D0 mesons and their charge conjugates are reconstructed from the hadronic decay D0 → K−𝜋+. Jets are reconstructed from D0-meson candidates and charged particles using the anti-𝑘T algorithm with jet resolution parameter 𝑅 = 0.3, in the jet transverse momentum (𝑝T) range 5 < 𝑝ch jet T < 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 <𝑝ch jet T < 50GeV/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-theart 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.
