Annihilation of S-wave quarkonia and the measurement of alpha_s

Details Annihilation of S-wave quarkonia and the measurement of alpha_s Annihilation of S-wave quarkonia and the measurement of alpha_s

1997-01-23

arxiv.org/abs/hep-ph/9701353v2

Phys.Lett.B407:323-330,1997

Physics

High Energy Physics

High Energy Physics - Phenomenology

13 pages, revtex, one eps figure. A discussion of the subtraction scheme dependence of the NRQCD operators is added

Scientific paper

10.1016/S0370-2693(97)00744-2

We analyze the relativistic corrections to annihilation rates of S-wave quarkonia within the framework of NRQCD. We show that order v^2 corrections can be expressed in terms of the heavy quark pole mass and the quarkonium mass. The ratio of hadronic to radiative annihilation rates for eta_b and eta_c can therefore be predicted accurately. The contributions of color-octet operators to the hadronic decay rates of spin-triplet quarkonia are shown to be significant, even though they arise at order v^4 in the velocity expansion. We provide a rough estimate of the color-octet contributions and extract the value of alpha_s from the experimental data on Upsilon decays.

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