Search for Extra Dimensions in the Diphoton Final State with 0.9/fb of pp Collisions at the Large Hadron Collider

A search for extra spatial dimensions in the diphoton final state has been carried out with the CMS detector at the LHC. Both resonant diphoton production via Randall--Sundrum graviton decay and non-resonant diphoton production via virtual Kaluza--Klein graviton exchange are considered. No excess of events above the standard model expectation is found using a data sample collected in proton-proton collisions at $\sqrt{s} = 7$~TeV and corresponding to an integrated luminosity of 1.1~fb$^{-1}$. New lower limits on the effective Planck scale in the range of 2.2--3.7 TeV at the 95\% confidence level are set, providing the most restrictive bounds to date on the large extra dimensions model of Arkani-Hamed, Dimopoulos, and Dvali. Similarly, the most restrictive lower limits to date on the Randall--Sundrum graviton mass are set in the range of 0.76--1.73~TeV, for values of the coupling parameter between 0.01--0.10.