Probing the electromagnetic dipole moments of the tau-neutrino in the $U(1{)}_{B-L}$ model at the ILC and CLIC energies

Abstract

In this work we study the sensitivity on the anomalous magnetic and electric dipole moments of the tau-neutrino in the framework of the $SU(2{)}_L\times U(1{)}_Y\times U(1{)}_{B-L}$ electroweak model at future $e^{+}{e}^{-}$ linear colliders as the ILC and CLIC. For our study we consider the process $e^{+}{e}^{-}\to (Z,Z^{\prime },\gamma )\to {\nu }_{\tau }{\bar{\nu }}_{\tau }\gamma$. For center-of-mass energies of $\sqrt{s}=1000-3000GeV$ and integrated luminosities of $\mathcal{L}=500-2000f{b}^{-1}$, we derive $95\%$ C.L. limits on the dipole moments $|{\mu }_{{\nu }_{\tau }}({\mu }_B)|\le 6.28\times 10^{-9}$ and $|d_{{\nu }_{\tau }}(ecm)|\le 1.21\times 10^{-21}$ improve the existing limits by two or three orders of magnitude. Our study complements other studies on the dipole moments of the tau-neutrino at hadron and $e^{+}{e}^{-}$ colliders.

Comments: 28 pages, 6 figures. arXiv admin note: substantial text overlap with arXiv:1606.04144