Extraction of neutrino Yukawa parameters from displaced vertices of sneutrinos

Abstract

We study displaced signatures of sneutrino pairs potentially emerging at the Large Hadron Collider (LHC) in a Next-to-Minimal Supersymmetric Standard Model supplemented with right-handed neutrinos triggering a Type-I seesaw mechanism. We show how such signatures can be established through a heavy Higgs portal, the sneutrinos then decaying to charged leptons and charginos giving rise to further leptons or hadrons. We finally illustrate how the Yukawa parameters of neutrinos can be extracted by measuring the lifetime of the sneutrino from the displaced vertices, thereby characterising the dynamics of the underlying mechanism of neutrino mass generation. We show our numerical results for the case of both the current and High-Luminosity LHC.

Dedicated Triggers for Displaced Jets using Timing Information from Electromagnetic Calorimeter at HL-LHC

“…Several phenomenological studies explore the possibilities of LLP searches covering a wide range of models and signatures, such as those in Refs. [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30]. Collaborations of two major general purpose detectors at LHC, CMS and ATLAS, have also been actively performing several BSM studies involving various LLP signatures.…”

Measuring neutrino dynamics in NMSSM with a right-handed sneutrino LSP at the ILC

“…The Minimal Supersymmetric Standard Model (MSSM) still lacks a mechanism for neutrino mass generation, but it can be extended with various seesaw mechanisms. Supersymmetric models have the advantage that the superpartners of neutrinos, sneutrinos, may in some cases decay visibly at colliders and hence studying neutrino dynamics at colliders becomes possible [17,18]. However, current experimental constraints make it clear that non-minimal versions of SUSY are more suited to embed a neutrino mass generation mechanism [19].…”

Dedicated triggers for displaced jets using timing information from electromagnetic calorimeter at HL-LHC

“…Several phenomenological studies explore the possibilities of LLP searches covering a wide range of models and signatures, such as those in refs. [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30]. Collaborations of two major general purpose detectors at LHC, CMS and ATLAS, have also been actively performing several BSM studies involving various LLP signatures.…”