New Bounds on Light Sneutrino Masses: Rare SUSY Signals

TL;DR

This paper establishes new lower bounds on light sneutrino masses using collider data and proposes future search strategies at the HL-LHC to improve detection prospects.

Contribution

It provides the first bounds on sneutrino masses from mono-W/Z searches and suggests a novel search channel for future collider experiments.

Findings

Sneutrino masses are constrained to be above 55-100 GeV.

Invisible Higgs decay constraints imply a lower mass bound of about half the Higgs mass.

Proposed HL-LHC searches could significantly improve detection sensitivity.

Abstract

We study bounds on a neutral component of weak doublet scalar lepton. A typical example of such particle is sneutrinos in supersymmetric models. Using constraints from invisible Higgs decays we place a lower bound of approximately $m_h/2$. We recast a mono-$W/Z$ search, with hadronic vector boson tag in order to bound parameter space in the sneutrino--charged slepton mass plane. We find a lower bound on sneutrinos in the range of 55-100 GeV in the 36 $\text{fb}^{-1}$ data set depending on the mass of charged component. We propose a sensitivity search in the hadronic mono-$W/Z$ channel for HL-LHC and discuss both the discovery potential in case an excess is seen and exclusion limit assuming no excess is seen.