The $l=1$ Hyperfine Splitting in Bottomium as a Precise Probe of the QCD Vacuum.

Details The $l=1$ Hyperfine Splitting in Bottomium as a Precise Probe of the QCD Vacuum. The $l=1$ Hyperfine Splitting in Bottomium as a Precise Probe of the QCD Vacuum.

1995-01-18

arxiv.org/abs/hep-ph/9501338v1

Phys.Lett. B351 (1995) 541-545

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, 2 postscript figures, typeset with ReVTeX

Scientific paper

10.1016/0370-2693(95)00429-O

By relating fine and hyperfine spittings for l=1 states in bottomium we can factor out the less tractable part of the perturbative and nonperturbative effects. Reliable predictions for one of the fine splittings and the hyperfine splitting can then be made calculating in terms of the remaining fine splitting, which is then taken from experiment; perturbative and nonperturbative corrections to these relations are under full control. The method (which produces reasonable results even for the $c{\bar c}$ system) predicts a value of 1.5 MeV for the $(s=1)-(s=0)$ splitting in $b{\bar b}$, opposite in sign to that in $c{\bar c}$. For this result the contribution of the gluon condensate $<\alpha_s G^2>$ is essential, as any model (in particular potential models) which neglects this would give a negative $b{\bar b}$ hyperfine splitting.

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