Shear viscosity of a pion gas resulting from ρππ and σππ interactions

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Ghosh, Sabyasachi [UNESP]
Krein, Gastão [UNESP]
Sarkar, Sourav

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We have evaluated the shear viscosity of pion gas with vanishing chemical potential taking into account its scattering with the low mass resonances σ and ρ during propagation in the medium. The thermal width (or collisional rate) of pions is calculated from πσ and πρ loop diagrams using effective interactions in the real-time formulation of finite temperature field theory. A very small value of shear viscosity by entropy density ratio (η/s), close to the quantum bound, is obtained which approximately matches the range of values of η/s used by Niemi et al. [H. Niemi, G. S. Denicol, P. Huovinen, E. Molnár, and D. H. Rischke, Phys. Rev. Lett. 106, 212302 (2011)PRLTAO0031-900710.1103/PhysRevLett.106.212302; Phys. Rev. C 86, 014909 (2012)PRVCAN0556-281310.1103/PhysRevC.86.014909] to fit the elliptic flow data from the Relativistic Heavy Ion Collider. © 2014 American Physical Society.



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Physical Review C - Nuclear Physics, v. 89, n. 4, 2014.