<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>σ</mml:mi></mml:math>meson in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>J</mml:mi><mml:mo>/</mml:mo><mml:mi>ψ</mml:mi></mml:math>decays

Huo, Wu-Jun; Zhang, Xinmin; Huang, Tao

doi:10.1103/physrevd.65.097505

Cited by 12 publications

(15 citation statements)

References 11 publications

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“…On the theoretical side, this quantity is interesting as [54] λ π ≡ 1/ π in the [57] 0.390 0.282 5.82 Set 2 (E791) [58] 0.489 0.338 5.73 Set 3 (PDG min) [59] 0.400 0.400 6.85 Set 4 (PDG max) [59] 0.550 0.700 7.03 chiral limit m π = 0; as such, the m π dependence of λ π provides insight on the effects due to explicit chiral symmetry breaking [39].…”

Section: Formalismmentioning

confidence: 99%

Shear viscosity of a pion gas resulting fromρππandσππinteractions

2014

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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.

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Section: Formalismmentioning

confidence: 99%

Shear viscosity of a pion gas resulting fromρππandσππinteractions

2014

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“…7. The results of κ, for the mass-width parameters taken from BES 25,26 (solid line) and E791 27 (dashed line) experiments, are also included in the Fig. (7).…”

mentioning

confidence: 99%

Thermal conductivity of hot pionic medium due to pion self-energy for πσ and πρ loops

Ghosh

2015

Int. J. Mod. Phys. E

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The thermal conductivity of pionic medium has been evaluated with the help of its standard expression from the relaxation time approximation, where inverse of pion relaxation time or pion thermal width has been obtained from the imaginary part of pion self-energy. In the real-time formalism of thermal field theory, the finite temperature calculations of pion self-energy for πσ and πρ loops have been done. The numerical value of our thermal conductivity increases with temperature very softly, though at particular temperature, our estimation has to consider a large band of phenomenological uncertainty.

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“…The ratio of the high and low temperature slopes in the plot of ρ mag (T) in the ranges 9-20 and 200-300 K, respectively, is close to the value 0.029 expected for the doublet ground state. There is a sharp fall in ρ at 8.2 K as the T is lowered, which has been established as the onset of antiferromagnetic ordering [6,7]. As the pressure is increased, we note that the overall features are qualitatively the same up to 6 GPa.…”

Section: Resultsmentioning

confidence: 69%

“…that shows non-Fermi liquid behaviour at low temperature and shows superconductivity under pressure. Therefore, it is tempting to make clear how these anomalous things will be in the cases that blocs of Ce-Pd-Si slabs related to the CePd 2 Si 2 [5,7] seperated, and closer again by using the external pressure. In this study, we have carried out the electrical resistances measurement of Ce 2 Pd 3 Si 5 under pressure up to 8 GPa in the temperature interval 2.5-300 K.…”

Section: Introductionmentioning

confidence: 98%