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

Abstract

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_{μν}^a G_{μν}^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 $m_Q\to \infty$. The same arguments show the suppression of the $SU(3)$ symmetry breaking effects for vacuum condensates when the additional gluon fields are included.

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

References in corpus (1)

• The Pion Form Factor. Where Does It Come From?

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