A Search for Charged Massive Stable Particles

TL;DR

This paper reports a search for charged massive stable particles at the Tevatron collider, setting new mass limits for certain supersymmetric particles based on the absence of observed signals.

Contribution

It introduces a novel search method for stable supersymmetric particles using muon-like signatures and sets new mass limits based on collider data.

Findings

No excess over background observed.

Mass limits of 140 GeV for higgsino-like charginos.

Mass limits of 174 GeV for gaugino-like charginos.

Abstract

A search for charged massive (quasi-) stable particles with the D0 detector at the Tevatron collider based on 390 pb^{-1} of data is presented. The search is performed in the frameworks of gauge-mediated supersymmetry breaking and the minimal supersymmetric extentension of the standard model. The hypothetical particles are assumed to be pair-produced in p-anti-p collisions giving a signature of two reconstructed muon-like objects with high invariant mass and time-of-flights indicative of heavy particles. Since no excess over background is observed, cross-section limits for the pair-production of stable staus and charginos are set. Mass limits of 140 GeV for a higgsino-like chargino and 174 GeV for a gaugino-like chargino are set.