Search for New Physics in Lepton + Photon + X Events with 929 pb-1 of ppbar Collisions at roots = 1.96 TeV

TL;DR

This study searches for signs of new physics in high-energy proton-antiproton collisions by analyzing events with leptons, photons, and other particles, finding results consistent with Standard Model expectations.

Contribution

It extends previous searches by analyzing a larger dataset at higher collision energy with improved detector capabilities, providing more sensitive tests for new physics phenomena.

Findings

Observed event counts are consistent with Standard Model predictions.

No evidence found for previously reported anomalous events.

Results set constraints on theories beyond the Standard Model.

Abstract

We present results of a search at CDF in 929 pb-1 of ppbar collisions at 1.96 TeV for the anomalous production of events containing a high-transverse momentum charged lepton (either electron or muon) and photon, accompanied by missing transverse energy (MET), and/or additional leptons and photons, and jets (X). We use the same selection criteria as in a previous CDF Run I search, but with an order-magnitude larger data set, a higher ppbar collision energy, and the CDF II detector. We find 163 Lepton + Photon + MET + X events, compared to an expectation of 150.6+-13.0 events. We observe 74 Multi-Lepton + Photon + X events, compared to an expectation of 65.1+-7.7 events. We find no events similar to the Run I 2 electrons + 2 photons + MET event.