Search for Scalar Diphoton Resonances in the Mass Range $65-600$ GeV with the ATLAS Detector in $pp$ Collision Data at $\sqrt{s}$ = 8 $TeV$

TL;DR

This paper reports a search for new scalar particles decaying into two photons within the 65-600 GeV mass range using ATLAS data, setting limits on their production without finding evidence of new signals.

Contribution

It extends the search for scalar diphoton resonances to a wider mass range using ATLAS data, providing the most comprehensive limits to date.

Findings

No significant excess observed over background.

Set 95% CL upper limits on production cross-section.

Extended mass range coverage compared to previous searches.

Abstract

A search for scalar particles decaying via narrow resonances into two photons in the mass range $65-600$ GeV is performed using 20.3 fb$^{-1}$ of $\sqrt{s}$ = 8 TeV $pp$ collision data collected with the ATLAS detector at the Large Hadron Collider. The recently discovered Higgs boson is treated as a background. No significant evidence for an additional signal is observed. The results are presented as limits at the 95 % confidence level on the production cross-section of a scalar boson times branching ratio into two photons, in a fiducial volume where the reconstruction efficiency is approximately independent of the event topology. The upper limits set extend over a considerably wider mass range than previous searches.