Beneke, M. and Chapovsky, A. P. and Signer, A. and Zanderighi, G. (2004) 'Effective theory approach to unstable particle production.', Physical review letters., 93 . 011602.
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.
|Keywords:||Effective field-theory, Gauge-invariance, Heavy quarks.|
|Full text:||PDF - Other (127Kb)|
|Publisher Web site:||http://dx.doi.org/10.1103/PhysRevLett.93.011602|
|Publisher statement:||© 2004 by The American Physical Society. All rights reserved.|
|Record Created:||28 Apr 2008|
|Last Modified:||05 Aug 2011 12:47|
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