Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1994-09-12
Physics
High Energy Physics
High Energy Physics - Phenomenology
(invited talk at the Tennessee International Symposium on Radiative Corrections, June 1994), 13 pages LaTeX, NUHEP-TH-94-22
Scientific paper
Most previous calculations of the annihilation decay rates of heavy quarkonium were based on factorization assumptions that were unproven and, in some cases, even incorrect. The recent development of a general factorization formula for heavy quarkonium annihilation rates has provided a rigorous theoretical foundation for such calculations. The factorization formula is based on the use of the effective field theory NRQCD to factor the decay rate into short-distance coefficients that can be calculated in perturbation theory and long-distance matrix elements that can be computed using lattice simulations. This approach allows annihilation decay rates to be computed entirely from first principles.
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