Screening of heavy quark free energies at finite temperature and non-zero baryon chemical potential

Doering M, Ejiri S, Kaczmarek O, Karsch F, Laermann E (2006)
European Physical Journal C 46(1): 179-189.

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Zeitschriftenaufsatz | Veröffentlicht | Englisch
Abstract / Bemerkung
We analyze the dependence of heavy quark free energies on the baryon chemical potential (mu_b) in 2-flavour QCD using improved (p4) staggered fermions with a bare quark mass of m/T = 0.4. By performing a 6th order Taylor expansion in the chemical potential which circumvents the sign problem. The Taylor expansion coefficients of colour singlet and colour averaged free energies are calculated and from this the expansion coefficients for the corresponding screening masses are determined. We find that for small mu_b the free energies of a static quark anti-quark pair decrease in a medium with a net excess of quarks and that screening is well described by a screening mass which increases with increasing mu_b. The mu_b-dependent corrections to the screening masses are well described by perturbation theory for T > 2 T_c. In particular, we find for all temperatures above T_c that the expansion coefficients for singlet and colour averaged screening masses differ by a factor 2.
Erscheinungsjahr
Zeitschriftentitel
European Physical Journal C
Band
46
Zeitschriftennummer
1
Seite
179-189
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eISSN
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Doering M, Ejiri S, Kaczmarek O, Karsch F, Laermann E. Screening of heavy quark free energies at finite temperature and non-zero baryon chemical potential. European Physical Journal C. 2006;46(1):179-189.
Doering, M., Ejiri, S., Kaczmarek, O., Karsch, F., & Laermann, E. (2006). Screening of heavy quark free energies at finite temperature and non-zero baryon chemical potential. European Physical Journal C, 46(1), 179-189. doi:10.1140/epjc/s2005-02462-y
Doering, M., Ejiri, S., Kaczmarek, O., Karsch, F., and Laermann, E. (2006). Screening of heavy quark free energies at finite temperature and non-zero baryon chemical potential. European Physical Journal C 46, 179-189.
Doering, M., et al., 2006. Screening of heavy quark free energies at finite temperature and non-zero baryon chemical potential. European Physical Journal C, 46(1), p 179-189.
M. Doering, et al., “Screening of heavy quark free energies at finite temperature and non-zero baryon chemical potential”, European Physical Journal C, vol. 46, 2006, pp. 179-189.
Doering, M., Ejiri, S., Kaczmarek, O., Karsch, F., Laermann, E.: Screening of heavy quark free energies at finite temperature and non-zero baryon chemical potential. European Physical Journal C. 46, 179-189 (2006).
Doering, M., Ejiri, S., Kaczmarek, Olaf, Karsch, Frithjof, and Laermann, Edwin. “Screening of heavy quark free energies at finite temperature and non-zero baryon chemical potential”. European Physical Journal C 46.1 (2006): 179-189.

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arXiv: hep-lat/0509001

Inspire: 691205

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