Radiation zeros and scalar particles beyond the standard model

Details Radiation zeros and scalar particles beyond the standard model Radiation zeros and scalar particles beyond the standard model

1998-05-14

arxiv.org/abs/hep-ph/9805328v1

Phys.Lett. B435 (1998) 364-372

Physics

High Energy Physics

High Energy Physics - Phenomenology

18 pages (LaTeX) plus 5 postscript figures

Scientific paper

10.1016/S0370-2693(98)00807-7

Standard radiation zeros arise from the factorization properties of tree-level amplitudes involving a massless photon and can occur when all charged particles in the initial and final state have the same sign. We investigate how several different processes involving new scalar particles beyond the standard model may exhibit radiation zeros and how this structure might be exploited to probe their electromagnetic structure. We focus on (i) unnoticed aspects of angular zeros in the process e- + e- --> Delta-- + gamma for doubly charged Higgs boson (or any bilepton) production and (ii) the process gamma + e- --> q + S/V for scalar (S) or vector (V) leptoquarks (LQs). We also discuss how factorized amplitudes and radiation zeros may appear in the gauge boson fusion production of non-conjugate leptoquark pairs via gamma + W --> S_i + S_j* in high energy ee reactions and how the zeros affect the production cross-sections for various types of scalar leptoquarks.

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