Discovery Potential for GMSB Supersymmetry in ATLAS using the $Z\gamma + \not E_T$ Final State at a center of mass energy of $\sqrt{s}$=10 \TeV

TL;DR

This paper evaluates ATLAS detector's ability to discover GMSB supersymmetry via a specific Z gamma plus missing energy final state at 10 TeV, predicting potential detection of a 134.7 GeV neutralino with less than 3 fb^{-1} of data.

Contribution

It presents a sensitivity study for GMSB supersymmetry detection in the Z gamma plus missing energy channel at 10 TeV using simulated ATLAS data.

Findings

ATLAS can detect a 134.7 GeV neutralino with 5σ significance

Less than 3 fb^{-1} of data is sufficient for discovery

The study uses fully simulated Monte Carlo events for signal and background

Abstract

We have studied the sensitivity of the ATLAS detector for supersymmetric neutralino signals in the $Z\gamma +\notE_{T}$ final state in a GMSB model in which the Higgsino-like neutralino is NLSP. This study considers the reaction of $pp \ra \tilde{\chi}^{0}_{1} \tilde{\chi}^{0}_{1} \ra Z(\ra \ell^{+}\ell^{-})\gamma \tilde{G}\tilde{G}$, where $\ell = \mu/e$, at a center of mass energy of $\sqrt{s}$=10 \TeV using fully simulated ATLAS Monte Carlo events both for the signal and background. Based on the GMSB Model Line E predictions, we expect that, for an integrated luminosity of less then 3 fb$^{-1}$, ATLAS could detect the GMSB signal from the Higgsino-like neutralino that has a mass of 134.7 \GeV in the $Z\gamma +\notE_{T}$ final state with a significance of 5$\sigma$, assuming 20% systematic uncertainty.