Strong CP problem, Neutron EDM and Thermal QCD sum rules

Details Strong CP problem, Neutron EDM and Thermal QCD sum rules Strong CP problem, Neutron EDM and Thermal QCD sum rules

2003-11-20

arxiv.org/abs/hep-ph/0311261v1

AIP Conf. Proc. 717, (2004) 695-700.

Physics

High Energy Physics

High Energy Physics - Phenomenology

08 pages. Contributed to Hadron 03: 10th International Conference on Hadron Spectroscopy, Aschaffenburg, Germany, 31 Aug - 6 S

Scientific paper

10.1063/1.1799782

The behaviour of the broken CP symmetry at finite temperature is examined. This is achieved through the investigation of the neutron electric dipole moment $d_n$ induced by $\theta$-term. By using thermal QCD sum rules, we find that below the critical temperature, the ratio $\mid {d_n \over \bar{\theta}}\mid$ slightly decreases but survives at temperature effects. This evolution implies that CP remains broken at finite temperature as required by Baryogenesis \cite{Chabab}.

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