Intermediate mass dileptons as pre-equilibrium probes in heavy ion collisions - INSPIRE

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Intermediate mass dileptons as pre-equilibrium probes in heavy ion collisions

Maurice Coquet
(
- IRFU, Saclay, DPHN
)
,
Xiaojian Du
(
- Bielefeld U.
)
,
Jean-Yves Ollitrault
(
- IPhT, Saclay
)
,
Soeren Schlichting
(
- Bielefeld U.
)
,
Michael Winn
(
- IRFU, Saclay, DPHN
)

Apr 15, 2021

10 pages

Published in:

Phys.Lett.B 821 (2021) 136626

Published: Oct 10, 2021

e-Print:

2104.07622 [nucl-th]

DOI:

10.1016/j.physletb.2021.136626 (publication)

View in:

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Abstract: (Elsevier B.V.)

The production of dileptons with an invariant mass in the range

1 GeV < M < 5

GeV provides unique insight into the approach to thermal equilibrium in ultrarelativistic nucleus-nucleus collisions. In this mass range, they are produced through the annihilation of quark-antiquark pairs in the early stages of the collision. They are sensitive to the anisotropy of the quark momentum distribution, and also to the quark abundance, which is expected to be underpopulated relative to thermal equilibrium. We take into account both effects based on recent theoretical developments in QCD kinetic theory. We argue that the dilepton mass spectrum provides a measure of the shear viscosity to entropy ratio that controls the equilibration time. We evaluate the background from the Drell-Yan process and argue that future detector developments can suppress the additional background from semileptonic decays of heavy flavors.

Note:

10 pages, 7 figures; computation of the effective area is defined more rigorously, figures are updated accordingly. Added paragraph on page 7, discussing the impact of inhomogeneities in transverse density profile. Added paragraph in the conclusion on page 9, on fitting the invariant mass spectrum with a power function

dilepton: mass
heavy ion: scattering
dilepton: production
heavy quark: semileptonic decay
quark antiquark: annihilation
nucleus nucleus: scattering
quark: momentum spectrum
viscosity: density
entropy: density
density: ratio

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