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

Understand

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.