Breakdown of the Narrow Width Approximation for New Physics

Details Breakdown of the Narrow Width Approximation for New Physics Breakdown of the Narrow Width Approximation for New Physics

2007-03-05

arxiv.org/abs/hep-ph/0703058v2

Phys.Rev.Lett.99:111601,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 p., 3 figs, comments clarified, version to appear in PRL

Scientific paper

10.1103/PhysRevLett.99.111601

The narrow width approximation is used in high energy physics to reduce the complexity of scattering calculations. It is a fortunate accident that it works so well for the Standard Model, but in general it will fail in the context of new physics. We find numerous examples of significant corrections when the calculation is performed fully off-shell including a finite width, notably from effects from the decay matrix elements. If not taken into account, attempts to reconstruct the Lagrangian of a new physics discovery from data would result in considerable inaccuracies and likely inconsistencies.

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