Squeezed condensate of gluons and the mass of the eta'

Details Squeezed condensate of gluons and the mass of the eta' Squeezed condensate of gluons and the mass of the eta'

1997-06-27

arxiv.org/abs/hep-ph/9706528v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

References added, presentation of results improved, 17 pages, LaTeX, 1 figure

Scientific paper

The relation between the large mass of the $\eta'$ and the structure of the gluon vacuum via the $U_A(1)$ anomaly is discussed. A squeezed gluon vacuum is considered as an alternative to existing models. Considering Witten's formula for the $\eta_0$ mass we show that the contact term can give a sizable contribution and relate it to the physical gluon condensate. The values of the gluon condensate obtained through this relation are compared with the value by Shifman, Vainshtein and Zakharov and the recent update values by Narison.

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