Soft-pion emission in high-energy heavy-ion collisions

Blaizot, Jean‐Paul; Krzywicki, A.

doi:10.1103/physrevd.46.246

Cited by 199 publications

(244 citation statements)

References 16 publications

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“…For example they may have effects on the collective flows of neutral pions and eta mesons. In some sense they are similar to disoriented chiral condensates [55][56][57]. This is a topic that we will address in the future.…”

Section: Chiral Current Nonconservation Law and Pseudoscalar Condementioning

confidence: 99%

Pseudoscalar condensation induced by chiral anomaly and vorticity for massive fermions

Fang

Pang²,

Wang

et al. 2017

Phys. Rev. D

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We derive the pseudoscalar condensate induced by anomaly and vorticity from the Wigner function for massive fermions in homogeneous electromagnetic fields. It has an anomaly term and a forcevorticity coupling term. As a mass effect, the pseudoscalar condensate is linearly proportional to the fermion mass in small mass expansion. By a generalization to two-flavor and three-flavor cases, the neutral pion and eta meson condensates are calculated from the Wigner function and have anomaly parts as well as force-vorticity parts, in which the anomaly part of the neutral pion condensate is consistent to the previous result. We also discuss about possible observables of the condensates in heavy ion collisions such as collective flows of neutral pions and eta mesons which may be influenced by the electromagnetic field and vorticity profiles.

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Section: Chiral Current Nonconservation Law and Pseudoscalar Condementioning

confidence: 99%

Pseudoscalar condensation induced by chiral anomaly and vorticity for massive fermions

Fang

Pang²,

Wang

et al. 2017

Phys. Rev. D

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“…Finally, if the transition is a crossover, as is likely at RHIC where µ B is small, and if this crossover is traversed sufficiently quickly that the dynamics can be treated as a "maximally out of equilibrium" quench, then long wavelength oscillations of the chiral condensate are excited to amplitudes which are greatly in excess of those present in equilibrium [10]. The primary signal of these disorientations of the chiral condensate (DCC) is a large number of soft pions exhibiting large fluctuations in isospin [11][12][13][14]10], which have been looked for and not seen in lower energy heavy ion collisions at the CERN SPS [15]. Many other DCC signatures have also been discussed [16].…”

Section: Introductionmentioning

confidence: 99%

Langevin evolution of disoriented chiral condensate

Bettencourt¹,

Rajagopal²,

Steele³

2001

Nuclear Physics A

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As the matter produced in a relativistic heavy ion collision cools through the QCD phase transition, the dynamical evolution of the chiral condensate will be driven out of thermal equilibrium. As a prelude to analyzing this evolution, and in particular as a prelude to learning how rapid the cooling must be in order for significant deviations from equilibrium to develop, we present a detailed analysis of the time-evolution of an idealized region of disoriented chiral condensate. We set up a Langevin field equation which can describe the evolution of these (or more realistic) linear sigma model configurations in contact with a heat bath representing the presence of other shorter wavelength degrees of freedom. We first analyze the model in equilibrium, paying particular attention to subtracting ultraviolet divergent classical terms and replacing them by their finite quantum counterparts. We use known results from lattice gauge theory and chiral perturbation theory to fix nonuniversal constants. The result is a theory which is ultraviolet cutoff independent and that reproduces quantitatively the expected equilibrium behavior of the quantum field theory of pions and σ fields over a wide range of temperatures. Finally, we estimate the viscosity η(T ), which controls the dynamical timescale in the Langevin equation, by requiring that the timescale for DCC decay agrees with previous calculations. The resulting η(T ) is larger than that found perturbatively. We also determine the temperature below which the classical field Langevin equation ceases to be a good model for the quantum field dynamics.

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“…Jets, Centauros, and very high energy heavy ion collisions may be three such cases. For Centauros and heavy ions there has recently been some work along these lines [9], [10], [11]. These approaches, like ours, take classical, nonperturbative QCD as their starting point.…”

mentioning

confidence: 99%

Coherent pion radiation from nucleon-antinucleon annihilation

et al. 1994

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A unified picture of nucleon antinucleon annihilation into pions emerges from a classical description of the pion wave produced in annihilation and the subsequent quantization of that wave as a coherent state. When the constraints of energy-momentum and iso-spin conservation are imposed on the coherent state, the pion number distribution and charge ratios are found to be in excellent agreement with experiment.

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Soft-pion emission in high-energy heavy-ion collisions

Cited by 199 publications

References 16 publications

Pseudoscalar condensation induced by chiral anomaly and vorticity for massive fermions

Pseudoscalar condensation induced by chiral anomaly and vorticity for massive fermions

Langevin evolution of disoriented chiral condensate

Coherent pion radiation from nucleon-antinucleon annihilation

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