Final taus and initial state polarization signatures from effective interactions of Majorana neutrinos at future colliders

Lucía Duarte; Gabriel Zapata; Oscar A. Sampayo

doi:10.1140/epjc/s10052-019-6734-3

EPJ

Final taus and initial state polarization signatures from effective interactions of Majorana neutrinos at future $e^{+}e^{-}$ colliders

Lucía Duarte¹^*, Gabriel Zapata²^,3 and Oscar A. Sampayo²^,3

¹ Instituto de Física, Facultad de Ingeniería, Universidad de la República, Julio Herrera y Reissig 565, 11300, Montevideo, Uruguay
² Instituto de Investigaciones Físicas de Mar del Plata (IFIMAR) CONICET, UNMDP, Mar del Plata, Argentina
³ Departamento de Física, Universidad Nacional de Mar del Plata, Funes 3350, 7600, Mar del Plata, Argentina

Received: 9 December 2018
Accepted: 28 February 2019
Published online: 15 March 2019

Abstract

We study the possibility of future $e^{+}e^{-}$ colliders to disentangle different new physics contributions to the production of heavy sterile Majorana neutrinos in the lepton number violating channel $e^{+}e^{-}\rightarrow l^{+} l^{+}+ 4 {\text {jets}}$ , with $l=e, \mu , \tau$ . This is done investigating the final anti-tau polarization trails and initial beam polarization dependence of the signal on effective operators with distinct Dirac–Lorentz structure contributing to the Majorana neutrino production and decay, which parameterize new physics from a higher energy scale. We find that both analyses could well disentangle possible vectorial and scalar operators contributions.

12 Internat. Congress of the Balkan Physical Union
July 8-12, 2025
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EPJ

Final taus and initial state polarization signatures from effective interactions of Majorana neutrinos at future colliders

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Final taus and initial state polarization signatures from effective interactions of Majorana neutrinos at future $e^{+}e^{-}$ colliders