Improvements on perturbative oscillation formulas including non-standard neutrino interactions

Author(s)

Chaves, M. E. ^{[1, 2, 3]} ; Gratieri, D. R. ^{[1, 4]} ; Peres, O. L. G. ^[1]

Affiliation

^[1] Univ Estadual Campinas, Inst Fis Gleb Wataghin, BR-13083859 Campinas, SP - Brazil

^[2] Univ Fed Fluminense, Inst Fis, BR-24210310 Niteroi, RJ - Brazil

^[3] UFF, Inst Ciencias Exatas, BR-27213145 Volta Redonda, RJ - Brazil

^[4] UFF, Escola Engn Ind Met Volta Redonda, BR-27225125 Volta Redonda, RJ - Brazil

• Document type: Journal article
• Source: JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS; v. 48, n. 1 JAN 2021.
• Web of Science Citations: 0

Abstract

We use perturbation theory to obtain neutrino oscillation probabilities, including the standard mass-mixing paradigm and non-standard neutrino interactions (NSI). The perturbation is made on the standard parameters Delta m212/Delta m312<i and sin(2)(theta(13)) and on the non-diagonal NSI parameters, but keeps diagonal NSI parameters non-perturbated. We perform the calculation for the channels nu(mu) -> nu(e) and nu(mu) -> nu(mu). The resulting oscillation formulas are compact and present functional structure similar to the standard oscillation (SO) case. They apply to a wide range in the allowed NSI space of parameters and include the previous results from perturbative approaches as limit cases. Also, we use the compact formulas we found to explain the origin of the degeneracies in the neutrino probabilities in terms of the invariance of amplitude and phase of oscillations. Then we determine analytically the multiple sets of combinations of SO and NSI parameters that result in oscillation probabilities identical to the SO case. (AU)

• FAPESP's process: 14/19164-6 - Challenges in the 21st century in neutrino physics and astrophysics
• Grantee: Orlando Luis Goulart Peres
• Support Opportunities: Special Projects