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Abstract
| The baryon chemical potential µB is a fundamental parameter for
the statistical mechanical description of particle production in heavy-ion collisions:
its value encodes the average net baryon content of the fireball at chemical freeze-out.
The first µB measurement in high-energy Pb-Pb collisions at the LHC was published
in 2018 in Nature, and it was found that µB = 0.7 ± 3.8MeV. In this contribution,
an improved µB measurement based on the study of antiparticle-to-particle ratios
for protons, 3He and hypertriton (3
.H) using the data collected by ALICE in Run 2
of the LHC, is presented. The isospin chemical potential is also determined via the
p
-
/p+ ratio. The obtained µB represents the most precise measurement available. |