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Título:
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Charm diffusion in a pion gas implementing unitarity, chiral and heavy quark symmetries.
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Autores:
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Llanes Estrada, Felipe José ;
Torres Rincón, Juan Miguel ;
Cabrera Urban, Daniel
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Tipo de documento:
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texto impreso
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Editorial:
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Academic Press Inc Elsevier Science, 2011-10
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Dimensiones:
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application/pdf
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Nota general:
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info:eu-repo/semantics/openAccess
info:eu-repo/semantics/openAccess
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Idiomas:
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Palabras clave:
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Estado = Publicado
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Materia = Ciencias: Física
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Tipo = Artículo
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Resumen:
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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 p(2)-independent at a fixed temperature which simplifies phenomenological analysis. At the higher end of reliability of our calculation, T similar or equal to 150 MeV, we report a charm relaxation length lambda(c) similar or equal to 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.
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En línea:
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https://eprints.ucm.es/id/eprint/22303/1/Llanes-Estrada_FJ08.pdf
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