Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2004-12-13
Phys.Lett.B613:162-169,2005
Physics
High Energy Physics
High Energy Physics - Phenomenology
13 pages, 3 figures. V2: one figure and comments added. Published version
Scientific paper
10.1016/j.physletb.2005.03.055
The Standard Model differential cross section for $\bar{\nu}_e-e^-$ elastic scattering vanishes exactly, at lowest order, for forward electrons and incident $\bar{\nu}_e$ energy close to the rest energy of the electron. This dynamical zero is not induced by a fundamental symmetry of the Lagrangian but by a destructive interference between the left- and right-handed chiral couplings of the electron in the charged and neutral current amplitudes. We show that lowest order analyses based on this favorable kinematic configuration are only mildly affected by the inclusion of the $O(\alpha)$ radiative corrections in the $\bar{\nu}_e-e^-$ differential cross section, thus providing an excellent opportunity for the search of ``new physics''. In the light of these results, we discuss possible methods to improve the upper limits on the neutrino magnetic moment by selecting recoil electrons contained in a forward narrow cone. We conclude that, in spite of the obvious loss in statistics, one may have a better signal for small angular cones.
Bernabeu Jose
Papavassiliou Joannis
Passera Massimo
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