Single- and multi-photon final states with missing energy at e+e- colliders

Details Single- and multi-photon final states with missing energy at e+e- colliders Single- and multi-photon final states with missing energy at e+e- colliders

1998-07-22

arxiv.org/abs/hep-ph/9807465v1

Nucl.Phys. B541 (1999) 31-49

Physics

High Energy Physics

High Energy Physics - Phenomenology

LaTeX, 20 pages, 10 figures included

Scientific paper

10.1016/S0550-3213(98)00795-0

The search for new physics in single- and multi-photon final states with large missing energy at LEP and future e^+ e^- colliders requires precise predictions for the Standard Model irreducible background. While at LEP1 the theoretical situation is under control, going to LEP2 (and beyond) some improvements are necessary. To approach the aimed $O(1%)$ theoretical accuracy, the tree-level matrix elements for the processes $e^+ e^- \to \nu \bar\nu n\gamma$, with n=1,2,3, are exactly computed in the Standard Model, including the possibility of anomalous couplings for single-photon production. Due to the presence of observed photons in the final state, particular attention is paid to the treatment of higher-order QED corrections. Comparisons with existing calculations are shown and commented. An improved version of the event generator NUNUGPV is presented.

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