CDF Logo Analysis of High Mass Di-Photon Events and Search for Randall-Sundrum Gravitons Exotics Logo
The analysis searches for a high-mass state decaying to two photons. The sample corresponds to 345 pb^-1 of Tevatron Run II data taken at sqrt(s) = 1.96 TeV between February 2002 and July 2004. We examine data with two photons in the central calorimeter (|η| < 1.04) with E_T > 15 GeV. Since the data are consistent with Standard Model prediction, we place upper limits on the cross section times branching ratio of Randall-Sundrum graviton production and decay to diphotons. All results are preliminary.


Plots and Tables:

Diphoton invariant mass distribution:
Di-photon invariant mass plot, EPS or GIF, in variable bin widths with bin widths comparable to the mass resolution (sigma = sqrt(M)) and an additional 2% constant term to account for the EM resolution.

Comparison of data with background expectations:
Comparison of Standard Model di-photon contribution plus misidentified jets with observed data, EPS or GIF.
Comparison of fitted background contribution with observed data, 5 GeV/c**2 mass bins, EPS or GIF.

Cross-section, mass, and combined RS graviton limits:
95% confidence level RS graviton cross-section times branching ratio limits as function of graviton mass, EPS or GIF.
95% confidence level RS graviton mass limits in the graviton mass versus coupling, k/M_Planck, plane, EPS or GIF.
Combined 95% confidence level RS graviton mass limits of the di-photon and di-lepton searches in the graviton mass versus coupling, k/M_Planck, plane, EPS or GIF.

Cos(tetha*) distributions:
Collins-Soper cos(theta*) distribution, EPS, GIF. The distributions are normalized to the number of events in the data.
Collins-Soper cos(theta*) distribution of events with a mass larger than 200 GeV/c**2, EPS, GIF. The distributions are normalized to the number of events in the data.

Page page: http://www-cdf.fnal.gov/physics/exotic/r2a/20040805.diphoton_rs_grav/index.html was last updated October 4th, 2004 by Stephan Lammel.
Contact, Legal Notices, and Fermilab Policy on Computing