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metadata.dc.type: | Artigo de Periódico |
Title: | Charm diffusion in a pion gas implementing unitarity, chiral and heavy quark symmetries |
Other Titles: | Annals of Physics |
Authors: | Abreu, Luciano Melo Cabrera, Daniel Estrada, Felipe J. Llanes Rincon, Juan M. Torres |
metadata.dc.creator: | Abreu, Luciano Melo Cabrera, Daniel Estrada, Felipe J. Llanes Rincon, Juan M. Torres |
Abstract: | We compute the charm drag and diffusion coefficients in a hot pion gas, such as is formed in a heavy ion collision after the system cools sufficiently to transit into the hadron phase. We fully exploit heavy quark effective theory (with both D and D∗ mesons as elementary degrees of freedom during the collision) and chiral perturbation theory, and employ standard unitarization to reach higher temperatures. We find that a certain friction and shear diffusion coefficients are almost p2-independent at a fixed temperature which simplifies phenomenological analysis. At the higher end of reliability of our calculation, T ≃ 150 MeV, we report a charm relaxation length λc ≃ 40 fm, in agreement with the model estimate of He, Fries and Rapp. The momentum of a 1 GeV charm quark decreases about 50 MeV per fermi when crossing the hadron phase. |
Keywords: | Charmed mesons Heavy ion collisions Diffusion coefficient Chiral perturbation theory Heavy quark effective theory |
URI: | http://www.repositorio.ufba.br/ri/handle/ri/5446 |
Issue Date: | 2011 |
Appears in Collections: | Artigo Publicado em Periódico (FIS) |
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