Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1994-07-20
Phys.Rev. D51 (1995) 1125-1171; Erratum-ibid. D55 (1997) 5853
Physics
High Energy Physics
High Energy Physics - Phenomenology
Revised to clarify the velocity-scaling rules for spin-flip transitions, to correct error estimates, and to emphasize probabil
Scientific paper
10.1103/PhysRevD.51.1125
A rigorous QCD analysis of the inclusive annihilation decay rates of heavy quarkonium states is presented. The effective-field-theory framework of nonrelativistic QCD is used to separate the short-distance scale of annihilation, which is set by the heavy quark mass $M$, from the longer-distance scales associated with quarkonium structure. The annihilation decay rates are expressed in terms of nonperturbative matrix elements of 4-fermion operators in nonrelativistic QCD, with coefficients that can be computed using perturbation theory in the coupling constant $\alpha_s(M)$. The matrix elements are organized into a hierarchy according to their scaling with $v$, the typical velocity of the heavy quark. An analogous factorization formalism is developed for the production cross sections of heavy quarkonium in processes involving momentum transfers of order $M$ or larger. The factorization formulas are applied to the annihilation decay rates and production cross sections of S-wave states, up to corrections of relative order $v^3$, and of P-wave states, up to corrections of relative order $v^2$.
Bodwin Geoffrey T.
Braaten Eric
Lepage Peter G.
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