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Effective theory approach to unstable particle production.

By M. Beneke, A. P. Chapovsky, A. Signer and G. Zanderighi


Using the hierarchy of scales between the mass M and the width Gamma of a heavy, unstable particle, we construct an effective theory that allows calculations for resonant processes to be systematically expanded in powers of the coupling alpha and Gamma/M. We illustrate the method by computing the next-to-leading order line shape of a scalar resonance in an Abelian gauge-Yukawa model

Topics: Effective field-theory, Gauge-invariance, Heavy quarks.
Publisher: American Physical Society
Year: 2004
DOI identifier: 10.1103/PhysRevLett.93.011602
OAI identifier:

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