Sommerfeld effect in heavy quark chemical equilibration

Bödeker, D.; Laine, Mikko (2013). Sommerfeld effect in heavy quark chemical equilibration. Journal of High Energy Physics, 2013(1), 037. Springer 10.1007/JHEP01(2013)037

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The chemical equilibration of heavy quarks in a quark-gluon plasma proceeds via annihilation or pair creation. For temperatures T much below the heavy quark mass M, when kinetically equilibrated heavy quarks move very slowly, the annihilation in the colour singlet channel is enhanced because the quark and antiquark attract each other which increases their probability to meet, whereas the octet contribution is suppressed. This is the so-called Sommerfeld effect. It has not been taken into account in previous calculations of the chemical equilibration rate, which are therefore incomplete for T ≲ α2sM . We compute the leading-order equilibration rate in this regime; there is a large enhancement in the singlet channel, but the rate is dominated by the octet channel, and therefore the total effect is small. In the course of the computation we demonstrate how operators that represent the annihilation of heavy quarks in non-relativistic QCD can be incorporated into the imaginary-time formalism.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Theoretical Physics
10 Strategic Research Centers > Albert Einstein Center for Fundamental Physics (AEC)

UniBE Contributor:

Laine, Mikko Sakari

Subjects:

500 Science > 530 Physics

ISSN:

1029-8479

Publisher:

Springer

Language:

English

Submitter:

Esther Fiechter

Date Deposited:

19 Jun 2014 08:43

Last Modified:

17 Sep 2015 11:15

Publisher DOI:

10.1007/JHEP01(2013)037

BORIS DOI:

10.7892/boris.43759

URI:

https://boris.unibe.ch/id/eprint/43759

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