Journal article 1063 views
Anomalous pseudoscalar-photon vertex in and out of equilibrium
Prem Kumar 
,
Daniel Boyanovsky,
Hector de Vega,
Richard Holman
,
Daniel Boyanovsky,
Hector de Vega,
Richard Holman
Physical Review D, Volume: 61, Issue: 6
Swansea University Author:
Prem Kumar
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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...
| Published in: | Physical Review D |
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| Published: |
2000
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa16127 |
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| 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 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. |
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| College: |
Faculty of Science and Engineering |
| Issue: |
6 |