Prospects of heavy neutrino searches at future lepton colliders

Shankha Banerjee, P. S. Bhupal Dev, Alejandro Ibarra, Tanumoy Mandal, and Manimala Mitra
Phys. Rev. D 92, 075002 – Published 2 October 2015

Abstract

We discuss the future prospects of heavy neutrino searches at next generation lepton colliders. In particular, we focus on the planned electron-positron colliders, operating in two different beam modes, namely, e+e and ee. In the e+e beam mode, we consider various production and decay modes of the heavy neutrino (N), and find that the final state with e+2j+E, arising from the e+eNν production mode, is the most promising channel. However, since this mode is insensitive to the Majorana nature of the heavy neutrinos, we also study a new production channel e+eNe±W, which leads to a same-sign dilepton plus four jet final state, thus directly probing the lepton number violation in e+e colliders. In the ee beam mode, we study the prospects of the lepton number violating process of eeWW, mediated by a heavy Majorana neutrino. We use both cut-based and multivariate analysis techniques to make a realistic calculation of the relevant signal and background events, including detector effects for a generic linear collider detector. We find that with the cut-based analysis, the light-heavy neutrino mixing parameter |VeN|2 can be probed down to 104 at 95% C.L. for the heavy neutrino mass up to 400 GeV or so at s=500GeV with 100fb1 of integrated luminosity. For smaller mixing values, we show that a multivariate analysis can improve the signal significance by up to an order of magnitude. These limits will be at least an order of magnitude better than the current best limits from electroweak precision data, as well as the projected limits from s=14TeV LHC.

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  • Received 22 June 2015

DOI:https://doi.org/10.1103/PhysRevD.92.075002

© 2015 American Physical Society

Authors & Affiliations

Shankha Banerjee1,*, P. S. Bhupal Dev2,†, Alejandro Ibarra3,‡, Tanumoy Mandal1,§, and Manimala Mitra4,¶

  • 1Regional Centre for Accelerator-based Particle Physics, Harish-Chandra Research Institute, Chhatnag Road, Jhusi, Allahabad 211019, India
  • 2Consortium for Fundamental Physics, School of Physics and Astronomy, University of Manchester, Manchester M13 9PL, United Kingdom
  • 3Physik-Department T30d, Technische Univertität München, James-Franck-Straße, D-85748 Garching, Germany
  • 4Institute for Particle Physics Phenomenology, Durham University, Durham DH1 3LE, United Kingdom

  • *shankha@hri.res.in
  • bhupal.dev@hep.manchester.ac.uk
  • alejandro.ibarra@ph.tum.de
  • §tanumoymandal@hri.res.in
  • manimala.mitra@durham.ac.uk

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Issue

Vol. 92, Iss. 7 — 1 October 2015

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