Measuring tau neutrino appearance probability via unitarity
Abstract
We propose a unitarity method for determining τ neutrino appearance probability P (ν_{μ}→ν_{τ}) in longbaseline (LBL) accelerator experiments and atmospheric neutrino observations. When simultaneous in situ measurements of P (ν_{μ}→ν_{μ}) and P (ν_{μ}→ν_{e}) proceed, as is typical in the LBL experiments, one can use unitarity to "measure" P (ν_{μ}→ν_{τ}) . A theorists' toy analysis for the modelindependent determination of P (ν_{μ}→ν_{μ}) and P (ν_{μ}→ν_{e}) is presented by using the NOvA data. It is shown in our analysis that ≲5 % (8%) measurement of τ neutrino appearance probability in neutrino (antineutrino) mode is possible in the peak region 1.5 ≲E_{ν}≲2.5 GeV . The ν SM independent nature of determination of the probabilities is emphasized.
 Publication:

Physical Review D
 Pub Date:
 November 2021
 DOI:
 10.1103/PhysRevD.104.093006
 arXiv:
 arXiv:2109.06933
 Bibcode:
 2021PhRvD.104i3006M
 Keywords:

 High Energy Physics  Phenomenology;
 High Energy Physics  Experiment
 EPrint:
 Published version. New references added. 22 pages, 5 figures