Publication: Heavy flavor relaxation in a hadronic medium
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2013-09-20
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Elsevier Science Bv
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Charm and bottom transport coefficients in a medium constituted of light mesons, such as is formed in the hadronic phase of heavy-ion collisions, are obtained within an effective field theory approach implementing heavy-quark symmetry and chiral symmetry breaking. Heavy flavor propagates in the medium as D/B and D∗/B∗ degrees of freedom, and unitarization of the lowest order heavy–light meson amplitudes is used in order to reach high temperatures. The latter accounts for dynamically generated resonances in isospin ½ channels, a feature that leads to a more efficient heavy-flavor diffusion. We discuss the temperature and momentum dependence of the friction and diffusion coefficients in a transport approach up to temperature of about T 150 MeV, and provide estimates of the charm/bottom relaxation lengths and momentum loss. Implications for heavy-meson spectrum observables in heavy ion collisions are discussed.
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© 2013 Elsevier B.V. All rights reserved.
We want to thank Feng-Kun Guo, Juan Nieves, Santosh Ghosh, Christine Davies and Rachel Dowdall for clarifications and comments. We acknowledge financial support from grants FPA2011-27853-C02-01, FPA2011-27853-C02-02, FIS2008-01323 (Ministerio de Economía y Competitividad, Spain) and from the EU Integrated Infrastructure Initiative Hadron Physics Project under Grant Agreement No. 227431. L.M.A. thanks CAPES (Brazil) for partial financial support. D.C. acknowledges financial support from Centro Nacional de Física de Partículas, Astropartículas y Nuclear (CPAN, Consolider-Ingenio 2010) postdoctoral programme. J.M.T.R. is a recipient of an FPU grant (Ministerio de Educación, Cultura y Deporte, Spain).
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