Distributions for tau neutrino interactions observed through the decay τ → μν_{τ}ν_{barμ}
Abstract
We investigate the problem of identifying ν_{τ}induced reactions in large neutrino telescopes. We concentrate on events with tracks and showers where the respective energies E_{μ} and E_{X} are measured separately. Then we compute analytically and numerically event distributions in two variables r_{l} =E_{X} /E_{l} and y^{‧} =E_{X} / (E_{μ} +E_{X}). We find that the y^{‧}distribution is especially useful because in the ν_{τ}induced reactions the distribution has a minimum at y^{‧} = 0.75 and then increases as y^{‧} → 1. This is different in ν_{μ}induced reactions where the y^{‧}distribution decreases monotonically. The results are demonstrated with figures where one can estimate the required sensitivity of the experiments. Another attractive property is that in several ratios the neutrino flux factorizes and drops out. We hope the results of this article will be useful for searches of tau (anti)neutrinos of energies above 100 GeV to several TeV in the present and planned large volume neutrino telescopes.
 Publication:

Physics Letters B
 Pub Date:
 February 2017
 DOI:
 10.1016/j.physletb.2016.12.037
 arXiv:
 arXiv:1605.04864
 Bibcode:
 2017PhLB..765..272A
 Keywords:

 Tau neutrino;
 Neutrino detection;
 High Energy Physics  Phenomenology
 EPrint:
 16 pages, 4 figures. The shorter version will be published in Physics Letters B