What do heavy-light ($ Q\bar{q} $) quark systems tell us about QCD vacuum properties?

Details What do heavy-light ($ Q\bar{q} $) quark systems tell us about QCD vacuum properties? What do heavy-light ($ Q\bar{q} $) quark systems tell us about QCD vacuum properties?

1993-11-23

arxiv.org/abs/hep-ph/9311349v1

Phys.Lett.B325:449-458,1994

Physics

High Energy Physics

High Energy Physics - Phenomenology

SMU-HEP-PH-9323, 18pages, LATEX

Scientific paper

10.1016/0370-2693(94)90039-6

Arguments in favor of a large magnitude ( at least two- three times bigger than its factorized value) of the mixed vacuum condensate $ \la \bar{q}G_{\mu\nu}^a G_{\mu\nu}^a q \ra$ are given. The analysis is based on the strict inequalities which follow from the QCD sum rules method and on very plausible phenomenological assumptions like $ m_{B_s} > m_{B_u} $ for the few lowest exited $ Q\bar{q} $ states in a heavy quark limit $m_Q\rightarrow\infty $. The same arguments show the suppression of the $SU(3)$ symmetry breaking effects for vacuum condensates when the additional gluon fields are included.

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