Search for New Physics in High Mass Electron-Positron Events in ppbar Collisions at sqrt(s) = 1.96 TeV

TL;DR

This study searches for new high-mass particles decaying into electron-positron pairs in proton-antiproton collisions, setting limits on certain theoretical models and finding no evidence of new resonances.

Contribution

First to analyze high-mass electron-positron events at this energy range, setting new exclusion limits on Z' and Randall-Sundrum graviton masses.

Findings

Excluded Z' masses below 923 GeV/c^2

Excluded Randall-Sundrum graviton masses below 807 GeV/c^2

Combined data excludes graviton masses below 889 GeV/c^2

Abstract

We report the results of a search for a narrow resonance in electron-positron events in the invariant mass range of 150-950 GeV/c^2 using 1.3 fb^-1 of ppbar collision data at sqrt(s) = 1.96 TeV collected by the CDF II detector at Fermilab. No significant evidence of such a resonance is observed and we interpret the results to exclude the standard model-like Z' with a mass below 923 GeV/c^2 and the Randall-Sundrum graviton with a mass below 807 GeV/c^2 for k/M_pl=0.1, both at the 95% confidence level. Combining with di-photon data excludes the Randall-Sundrum graviton for masses below 889 GeV/c^2 for k/M_pl=0.1.