RT Journal Article
T1 Charm diffusion in a pion gas implementing unitarity, chiral and heavy quark symmetries.
A1 Llanes Estrada, Felipe José
A1 Torres Rincón, Juan Miguel
A1 Cabrera Urban, Daniel
AB 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.
PB Academic Press Inc Elsevier Science
SN 0003-4916
YR 2011
FD 2011-10
LK https://hdl.handle.net/20.500.14352/43928
UL https://hdl.handle.net/20.500.14352/43928
LA eng
NO © 2011 Elsevier Inc. All rights reserved. This work was supported by grants FPA 2008-00592, FIS2008-01323, FPA2007-29115-E, FIS2006-03438, PR34-1856-BSCH, UCM-BSCH, GR58/08 910309, PR34/07-15875 (Spain) and by the EU Integrated Infrastructure Initiative Hadron Physics Project under Grant Agreement n. 227431. The authors are grateful to Li Sheng Geng for updating them on the current D pi meson effective Lagrangians. Luciano Abreu is grateful for the hospitality at Univ. Complutense of Madrid where this work has been completed and acknowledges financial support from CAPES/Fundacion Carolina. Daniel Cabrera acknowledges financial support from Centro Nacional de Fisica de Particulas, Astroparticulas y Nuclear (CPAN, Consolider-Ingenio 2010). Juan M. Torres-Rincon is recipient of an FPU scholarship from the Spanish Ministry of Education.
NO EU Integrated Infrastructure Initiative
NO CAPES/Fundacion Carolina
NO Centro Nacional de Fisica de Particulas, Astroparticulas y Nuclear (CPAN)
NO Spanish Ministry of Education
NO UCM-BSCH
DS Docta Complutense
RD 8 jun 2025