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Bremsstrahlung of Flavor-Degenerate Pairs by Neutrinos in the Nuclear Field

L. Chatterjee·M. R. Strayer·J. S. Wu
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Abstract

Neutrino Bremsstrahlung of flavor-degenerate pairs in the field of a nucleus is of potential importance for neutrino astrophysics and is representative of a class of processes connecting leptonic electroweak sectors to real or virtual photons. We focus on first generation flavor production by both electron and muon neutrinos and present Standard Model cross sections and distributions for lead and iron nuclei. The results (of order 10-41 cm2 for electron neutrino - lead collisions at 100 MeV) have been fitted to empirical formulae that can be used to estimate backgrounds to neutrino detection experiments and flux normalizations. A compact form of the matrix element obtained by analytic reduction is used to explain the distributions. The V-A limits of the cross sections are shown to agree with published work from the pre-neutral current era. Event signatures and the possible roles of these processes in stellar and laboratory neutrino physics are discussed. Cross sections are compared with those for neutrino-electron scattering for neutrino spectra corresponding to typical supernovae temperatures.

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L. Chatterjee, M. R. Strayer, J. S. Wu. 2001-06-22. Bremsstrahlung of Flavor-Degenerate Pairs by Neutrinos in the Nuclear Field. https://arxiv.org/abs/astro-ph/0106317

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