Search for Randall-Sundrum Gravitons in the Diphoton Channel in pp Collisions at sqrt(s) = 7 TeV

Summary

This note describes the search for Randall-Sundrum gravitons decaying in the di-photon channel at the CMS experiment, with 36.1 pb−1of √s = 7TeVproton-proton collision data. We find the spectrum to agree with Standard Model expectations, and find no evidence for a resonance. We therefore derive limits on the cross-section for the production of RS-gravitons, and hence on the parameters of the warped extra dimension model. For values of the coupling parameter ranging from 0.01 to 0.1, we find that at 95% C.L., graviton masses below 368 to 952GeV/c2 are excluded.

Our diphoton spectrum with data driven backgrounds using Jet/Photon fake rates, and SM diphoton Monte Carlo. From this we extrapolate limits on our high mass signal region:

These cross section limits are translated into mass limits for each value of the coupling constant:

Caltech contributions:

• Analysis/Ntuple production - weekly analysis of data during 2010 run
• data driven background estimate with templates - cross check of fake rate function estimates of each type of background, using template shapes for photons/jets
• beam halo systematics removal - An important sytematic on the fake rate estimates, which was originally missed by the Extra Dimensions analysis
• limit extraction from data - We will soon be competitive with Tevatron limits, using the data taken in 2011 up to the summer.

References

AN-2010/405

PAS-EXO-10-019

Public results twiki

-- Main.yma - 2011-04-06