TITLE

# Nonequilibrium chiral perturbation theory and disoriented chiral condensates

AUTHOR(S)
Nicola, Angel Go´mez
PUB. DATE
March 2000
SOURCE
AIP Conference Proceedings;2000, Vol. 508 Issue 1, p204
SOURCE TYPE
DOC. TYPE
Article
ABSTRACT
We analyze the extension of Chiral Perturbation Theory to describe a meson gas out of thermal equilibrium. For that purpose, we let the pion decay constant be a time-dependent function and work within the Schwinger-Keldysh contour technique. A useful connection with curved space-time QFT allows to consistently renormalize the model, introducing two new low-energy constants in the chiral limit. We discuss the applicability of our approach within a Relativistic Heavy-Ion Collision environment. In particular, we investigate the formation of Disoriented Chiral Condensate domains in this model, via the parametric resonance mechanism. Â© 2000 American Institute of Physics.
ACCESSION #
6028946

## Related Articles

• Resonance Chiral Theory for Low-Energy Ï€Ï€ Scattering. Shabalin, E. P. // Physics of Atomic Nuclei;Apr2000, Vol. 63 Issue 4, p594

The scattering of a pion on a pion in the energy region âˆšs â‰¤ 1 GeV is successfully described on the basis of pole diagrams featuring spinless, spin-1, and spin-2 intermediate particles, provided that the properties of these particles and of their interactions are deduced from the...

• Deuteron form factors in chiral effective theory: Regulator-independent results and the role of two-pion exchange. Valderrama, M. Pavón; Nogga, A.; Arriola, E. Ruiz; Phillips, D. R. // European Physical Journal A -- Hadrons & Nuclei;Jun2008, Vol. 36 Issue 3, p315

We evaluate the deuteron charge, quadrupole, and magnetic form factors using wave functions obtained from chiral effective theory (Ï‡ ET) when the potential includes one-pion exchange, chiral two-pion exchange, and genuine contact interactions. We study the manner in which the results for...

• Improved Pion Pion Scattering Amplitude from Dispersion Relation Formalism. Cavalcante, I. P.; Coutinho, Y. A.; Sá Borges, J. // AIP Conference Proceedings;2006, Vol. 814 Issue 1, p711

Pion-pion scattering amplitude is obtained from Chiral Perturbation Theory at one- and two-loop approximations. Dispersion relation formalism provides a more economic method, which was proved to reproduce the analytical structure of that amplitude at both approximation levels. This work extends...

• The pion transition form factor and the pion distribution amplitude. Noguera, S.; Vento, V. // European Physical Journal A -- Hadrons & Nuclei;Nov2010, Vol. 46 Issue 2, p197

Recent BaBar data on the pion transition form factor, whose Q-dependence is much steeper then predicted by asymptotic Quantum Chromodynamics (QCD), have caused a renewed interest in its theoretical description. We present here a formalism based on a model-independent description for low photon...

• Alpha-Alpha scattering, chiral symmetry and 8Be lifetime. Arriola, E. Ruiz // AIP Conference Proceedings;8/31/2008, Vol. 1030 Issue 1, p135

Alpha-alpha scattering is discussed in terms of a chiral two pion exchange potential (TPE) which turns out to be attractive and singular at the origin, hence demanding renormalization. When 8Be is treated as a resonance state a model independent correlation between the Q-factor and lifetime...

• Density Effects on the Pion Dispersion Relation at Finite Temperature. Ayala, Alejandro // AIP Conference Proceedings;2003, Vol. 670 Issue 1, p11

We study the behavior of the pion dispersion relation in a pion medium at finite density and temperature, introducing a chemical potential to describe the finite pion number density. Such description is particularly important during the hadronic phase of a relativistic heavy-ion collision,...

• Some aspects on the structure and reaction of Î˜+. Hosaka, Atsushi // AIP Conference Proceedings;2006, Vol. 865 Issue 1, p236

In this report, we discuss some aspects of the present theoretical status of the pentaquarks. In the first part we discuss the importance of the pion interaction due to spontaneous symmetry breaking of chiral symmetry, which affects the basic property such as the parity of Î˜+. In the second...

• Lattice simulations for light nuclei: Chiral effective field theory at leading order. Borasoy, B.; Epelbaum, E.; Krebs, H.; Lee, D.; Meißner, U. // European Physical Journal A -- Hadrons & Nuclei;Jan2007, Vol. 31 Issue 1, p105

We discuss lattice simulations of light nuclei at leading order in the chiral effective field theory. Using lattice pion fields and auxiliary fields, we include the physics of instantaneous one-pion exchange and the leading-order S-wave contact interactions. We also consider higher-derivative...

• Radiative corrections to neutral pion-pair production. Kaiser, N. // European Physical Journal A -- Hadrons & Nuclei;Dec2010, Vol. 46 Issue 3, p373

We calculate the one-photon loop radiative corrections to the neutral pion-pair photoproduction process $\pi^-\gamma \ensuremath \rightarrow\pi^-\pi^0\pi^0$ . At leading order this reaction is governed by the chiral pion-pion interaction. Since the chiral $\pi^{+}_{}$ $\pi^{-}_{}$ \$...

Share