Study of freeze-out dynamics of strange hadrons

Singh, Sushant K.; Ghosh, Purabi; Nayak, Jajati K.

doi:10.1103/PhysRevD.104.034027

Study of freeze-out dynamics of strange hadrons

Sushant K. Singh
(
- Calcutta, VECC and
- HBNI, Mumbai
)
,
Purabi Ghosh
(
- Fakir Mohan U., Balasore
)
,
Jajati K. Nayak
(
- Calcutta, VECC
)

Jun 30, 2020

9 pages

Published in:

Phys.Rev.D 104 (2021) 3, 034027

Published: Aug 1, 2021

e-Print:

2007.00053 [nucl-th]

DOI:

10.1103/PhysRevD.104.034027 (publication)

View in:

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Abstract: (APS)

We study the dynamics of chemical freeze-out of single strange hadrons—

K

,

Λ

,

Σ

, from a homogeneous and isotropically expanding system consisting of

π

,

K

,

ρ

,

N

,

Λ

, and

Σ

hadrons with zero net baryon density. We use the momentum-integrated Boltzmann equation or rate equation to study the evolution of strange hadrons considering Bjorken and Hubble-like expansions. We calculate the scattering rates of

K

,

Λ

,

Σ

and compare with the expansion rate to analyze the chemical freeze-out of these species. In this microscopic calculation the cross sections, which are input to the rate equation, are taken either from phenomenological models or are parametrized by comparing against experimental data. From this calculation it is found that these strange hadrons freeze out early near transition temperature

T_{c}

when the system follows a Hubble-like fast expansion. But, for a slower Bjorken-like expansion, strange hadrons take a longer time to decouple following a sequential behavior. The present calculation may set a guideline to understand the common freeze-out behavior of strange hadron species at Relativistic Heavy Ion Collider(RHIC) and Large Hadron Collider(LHC), which is mostly predicted by thermal models while explaining the yields of identified particles.

freeze-out: chemical
temperature: transition
freeze-out: temperature
matter: hadronic
baryon: density
model: thermal
Brookhaven RHIC Coll
strange particle
CERN LHC Coll
Boltzmann equation

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