Effective theory approach to unstable particle production

Details Effective theory approach to unstable particle production Effective theory approach to unstable particle production

2003-12-23

arxiv.org/abs/hep-ph/0312331v1

Phys.Rev.Lett. 93 (2004) 011602

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 1 figure

Scientific paper

10.1103/PhysRevLett.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.

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