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Anomalous pseudoscalar-photon vertex in and out of equilibrium

Prem Kumar Orcid Logo, Daniel Boyanovsky, Hector de Vega, Richard Holman

Physical Review D, Volume: 61, Issue: 6

Swansea University Author: Prem Kumar Orcid Logo

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DOI (Published version): 10.1103/PhysRevD.61.065002

Abstract

The anomalous pseudoscalar-photon vertex is studied in real time in and out of equilibrium in a constituent quark model. The goal is to understand the in-medium modifications of this vertex, exploring the possibility of enhanced isospin breaking by electromagnetic effects as well as the formation of...

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Published in: Physical Review D
Published: 2000
URI: https://cronfa.swan.ac.uk/Record/cronfa16127
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first_indexed 2013-09-26T11:46:05Z
last_indexed 2020-07-16T18:28:34Z
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spelling 2020-07-16T14:40:16.3131946 v2 16127 2013-09-20 Anomalous pseudoscalar-photon vertex in and out of equilibrium 087fd097167d724ce1b13cb285741ef5 0000-0003-0867-4213 Prem Kumar Prem Kumar true false 2013-09-20 SPH The anomalous pseudoscalar-photon vertex is studied in real time in and out of equilibrium in a constituent quark model. The goal is to understand the in-medium modifications of this vertex, exploring the possibility of enhanced isospin breaking by electromagnetic effects as well as the formation of neutral pion condensates in a rapid chiral phase transition in peripheral, ultrarela- tivistic heavy-ion collisions. In equilibrium the effective vertex is afflicted by infrared and pinch singularities that require hard thermal loop (HTL) and width corrections of the quark propagator. The resummed effective equilib- rium vertex vanishes near the chiral transition in the chiral limit. In a strongly out of equilibrium chiral phase transition we find that the chiral condensate drastically modifies the quark propagators and the effective vertex. The ensu- ing dynamics for the neutral pion results in a potential enhancement of isospin breaking and the formation of π0 condensates. While the anomaly equation and the axial Ward identity are not modified by the medium in or out of equilibrium, the effective real-time pseudoscalar-photon vertex is sensitive to low energy physics. Journal Article Physical Review D 61 6 31 12 2000 2000-12-31 10.1103/PhysRevD.61.065002 COLLEGE NANME Physics COLLEGE CODE SPH Swansea University 2020-07-16T14:40:16.3131946 2013-09-20T10:59:45.5261629 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Physics Prem Kumar 0000-0003-0867-4213 1 Daniel Boyanovsky 2 Hector de Vega 3 Richard Holman 4
title Anomalous pseudoscalar-photon vertex in and out of equilibrium
spellingShingle Anomalous pseudoscalar-photon vertex in and out of equilibrium
Prem Kumar
title_short Anomalous pseudoscalar-photon vertex in and out of equilibrium
title_full Anomalous pseudoscalar-photon vertex in and out of equilibrium
title_fullStr Anomalous pseudoscalar-photon vertex in and out of equilibrium
title_full_unstemmed Anomalous pseudoscalar-photon vertex in and out of equilibrium
title_sort Anomalous pseudoscalar-photon vertex in and out of equilibrium
author_id_str_mv 087fd097167d724ce1b13cb285741ef5
author_id_fullname_str_mv 087fd097167d724ce1b13cb285741ef5_***_Prem Kumar
author Prem Kumar
author2 Prem Kumar
Daniel Boyanovsky
Hector de Vega
Richard Holman
format Journal article
container_title Physical Review D
container_volume 61
container_issue 6
publishDate 2000
institution Swansea University
doi_str_mv 10.1103/PhysRevD.61.065002
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Biosciences, Geography and Physics - Physics{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Physics
document_store_str 0
active_str 0
description The anomalous pseudoscalar-photon vertex is studied in real time in and out of equilibrium in a constituent quark model. The goal is to understand the in-medium modifications of this vertex, exploring the possibility of enhanced isospin breaking by electromagnetic effects as well as the formation of neutral pion condensates in a rapid chiral phase transition in peripheral, ultrarela- tivistic heavy-ion collisions. In equilibrium the effective vertex is afflicted by infrared and pinch singularities that require hard thermal loop (HTL) and width corrections of the quark propagator. The resummed effective equilib- rium vertex vanishes near the chiral transition in the chiral limit. In a strongly out of equilibrium chiral phase transition we find that the chiral condensate drastically modifies the quark propagators and the effective vertex. The ensu- ing dynamics for the neutral pion results in a potential enhancement of isospin breaking and the formation of π0 condensates. While the anomaly equation and the axial Ward identity are not modified by the medium in or out of equilibrium, the effective real-time pseudoscalar-photon vertex is sensitive to low energy physics.
published_date 2000-12-31T03:18:25Z
_version_ 1763750451146129408
score 11.01753

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