Improved bounds on the dipole moments of the tau neutrino from high-energy gamma*e(-) and gamma*gamma* collisions at the ILC and CLIC

Abstract

In this work we study the potential of the processes e(+)e(-) -> e(+)gamma*e(-) -> e(+)tau(nu) over bar (tau)nu e and e(+)e(-) -> e(+)gamma*gamma*e(-) -> e(+)nu(tau)(nu) over bar (tau)e(-) at a future high-energy and high-luminosity linear electron positron collider, such as the International Linear Collider and Compact Linear Collider, to study the sensibility on the anomalous magnetic and electric dipole moments of the tau neutrino. For an integrated luminosity of 590 fb(-1) and center-of-mass energy of 3 TeV, we derive 95% C. L. limits on the dipole moments: mu(nu tau) <= 1.44 x 10(-6) mu B and d(nu tau) <= 2.78 x 10(-17) ecm in the gamma*e(-) collision mode and of mu(nu tau) <= 3.4 x 10(-7) mu B and d(nu tau) <= 6.56 x 10(-18)ecm with the gamma*gamma* collision mode, improving the existing limits.