Investigating charm quark energy loss in medium with the nuclear modification factor of D$^0$-tagged jets - INSPIRE

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Investigating charm quark energy loss in medium with the nuclear modification factor of D $^0$ -tagged jets

ALICE

Collaboration

Sep 18, 2024

25 pages

e-Print:

2409.11939 [nucl-ex]

Report number:

CERN-EP-2024-240

Experiments:

CERN-LHC-ALICE

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Abstract: (arXiv)

The nuclear modification factor

R_\mathrm{AA}

of charm jets, identified by the presence of a D

^0

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

\sqrt{s_{\rm NN}} = 5.02

TeV with the ALICE detector at the LHC. The D

^0

mesons and their charge conjugates are reconstructed from the hadronic decay D

^0\to \mathrm K^{-}\pi^{+}

. Jets are reconstructed from D

^0

-meson candidates and charged particles using the anti-

k_\mathrm{T}

algorithm with jet resolution parameter

R=0.3

, in the jet transverse momentum (

p_\mathrm{T}

) range

5< p_\mathrm{T}^\mathrm{ch~jet}<50

GeV/

c

and pseudorapidity

|\eta^\mathrm{ch~jet}| < 0.6

. A hint of reduced suppression in the charm-jet

R_\mathrm{AA}

is observed in comparison to inclusive jets in central Pb-Pb collisions with a significance of about 2

\sigma

in

20< p_\mathrm{T}^\mathrm{ch~jet}<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. Among these, LIDO provides the best description of the data, highlighting the role of mass effects in interpreting the results.

Note:

25 pages, 4 captioned figures, authors from page 19, submitted to PLB, figures at http://alice-publications.web.cern.ch/node/11307

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