Search for Randall-Sundrum Gravitons in the Diphoton Channel at CDF

TL;DR

This paper reports a search for Randall-Sundrum gravitons in the diphoton channel using Fermilab Tevatron data, setting new lower mass limits and confirming no deviation from the standard model.

Contribution

First search for Randall-Sundrum gravitons in diphoton channel at Tevatron, establishing new mass exclusion limits based on 5.4 fb$^{-1}$ data.

Findings

No excess observed in diphoton mass spectrum.

Lower mass limits of 459 GeV/c² and 963 GeV/c² for different couplings.

Set upper limits on production cross section for Randall-Sundrum gravitons.

Abstract

We report on a search for new particles in the diphoton channel using a data sample of $p\bar p$ collisions at $\sqrt{s} = 1.96$ TeV collected by the CDF II detector at the Fermilab Tevatron, with an integrated luminosity of 5.4 fb$^{-1}$. The diphoton invariant mass spectrum of the data agrees well with the standard model expectation. We set upper limits on the production cross section times branching ratio for the Randall-Sundrum graviton, as a function of diphoton mass. We subsequently derive lower limits on the graviton mass of 459 GeV$/c^{2}$ and 963 GeV$/c^{2}$, at the 95% confidence level, for coupling parameters ($k/\bar{M}_{Pl}$) of 0.01 and 0.1 respectively.