Revisiting Constraints on Fourth Generation Neutrino Masses

Details Revisiting Constraints on Fourth Generation Neutrino Masses Revisiting Constraints on Fourth Generation Neutrino Masses

2010-05-04

arxiv.org/abs/1005.0628v1

Phys.Rev.D82:114019,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

7 pages 1 fig

Scientific paper

10.1103/PhysRevD.82.114019

We revisit the current experimental bounds on fourth-generation Majorana neutrino masses, including the effects of right handed neutrinos. Current bounds from LEPII are significantly altered by a global analysis. We show that the current bounds on fourth generation neutrinos decaying to eW and mu W can be reduced to about 80 GeV (from the current bound of 90 GeV), while a neutrino decaying to tau W can be as light as 62.1 GeV. The weakened bound opens up a neutrino decay channel for intermediate mass Higgs, and interesting multi-particle final states for Higgs and fourth generation lepton decays.

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