Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1998-07-10
Phys.Lett.B440:77-88,1998
Physics
High Energy Physics
High Energy Physics - Phenomenology
Latex, 16 pages, no figures
Scientific paper
10.1016/S0370-2693(98)01085-5
It follows on general grounds that the theta dependence in QCD is more complicated than suggested by the large N_c approach or instanton arguments. Generically, the vacuum energy E_{vac}(\theta) is a multi-valued function of \theta admitting the existence of metastable states. We discuss decays of such metastable vacua in the theory with and without the axion, and point out the potential relevance of this and related phenomena for constraining a dark matter axion. Based on the analysis of the axion potential, an idea for a new axion search experiment at RHIC is suggested. It is noted that the false vacuum decay proceeds with maximal violation of CP, even if \theta = 0. We further speculate that the famous Sakharov criteria for baryogenesis could be satisfied at the QCD scale.
Halperin Igor
Zhitnitsky Ariel
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