On the spectrum of heavy quarkonium in the instanton liquidстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:The energy-level shift in heavy-quarkonium systems that is caused by fluctuations of vacuum
gluon fields is estimated by simulating these fields by an instanton liquid. The use of the corresponding
vacuum correlation function makes it possible to go beyond the dipole approximation. The width of energy
levels with respect to decay to e+e− pairs is also given. It is shown that, both for bottomonium and
for charmonium systems, an instanton medium can ensure a scale of shifts and widths of levels that is
compatible with experimental data. In particular, it is indicated that a sizable logarithmic contribution at
short distances is peculiar to the instanton vacuum.