Signals of heavy Majorana neutrinos at hadron colliders

Abstract

The lepton number violating signal of like-sign-dileptons (LSD), pp → ℓ ± ℓ ± + 2jets, is investigated within a model of mixing in the neutrino sector assuming 12.60. 13.15.+g, 14.60.St, Typeset using REVT E X

Multilepton and lepton jet probes of sub-weak-scale right-handed neutrinos

“…For higher-mass N , when its decays are prompt, our proposals for prompt trilepton searches could cover new ground by improving sensitivity to |V µN | 2 in the m b < M N < M W range by up to two orders of magnitude over existing bounds. This complements existing proposals for LHC searches in µ ± µ ± jj and trilepton final states that typically target M N > M Z [50][51][52][53][54][55][56][57][58][59][60][61][62][63][64][65][66] (although the reach of µ ± µ ± jj searches at the Tevatron and LHC for M N < M W are examined in [55,57,60]). In this high-mass scenario, N are produced through offshell gauge bosons and thus their decay products exhibit very different kinematics from M N < M W .…”

Flavor physics of leptons and dipole moments

“…It has been pointed out that a heavy Majorana neutrino (N ) may be produced via a DY type of mechanism at hadron colliders [597,[602][603][604][605][606], pp ! W + ! '…”

Exotic SUSY scenarios

“…The authors [4] consider models of ν masses which have an isosinglet neutrino N that mixes with the ordinary light one but wherein the mass and the mixing of the N are not linked together, unlike in the usual models based on he see-saw mechanism. This mixing is then treated as a phenomenological parameter constrained by the LEP data.…”

“…Small departures from the standard assumptions of the SM and the MSSM are the common feature unifying all of them. The results presented are based on four abstracts [1,2,3,4] submitted to this meeting. Supersymmetry and models for non-zero ν masses indeed form a very big part of all the current Beyond the Standard Model (BSM) discussions.…”

“…R p SUSY provides one of the most economical ways of generating non-zero ν masses. In the last abstract [4] a new aspect of the collider signatures of the heavy Majorana neutrino, an important ingredient of all the models of ν masses not involving R p SUSY, is presented.…”