Inclusive Search for Anomalous Production of High-pT Like-Sign Lepton Pairs in Proton-Antiproton Collisions at sqrt{s}=1.8 TeV

TL;DR

This paper conducts a model-independent search for high-pT like-sign lepton pairs in proton-antiproton collisions, finding no excess events and setting limits on new physics scenarios.

Contribution

It introduces an inclusive search strategy with unbiased final cuts and provides the first limits on anomalous like-sign lepton production at this energy.

Findings

No events observed in the signal region.

Set 95% CL limits on new physics processes.

Consistent with Standard Model background expectations.

Abstract

We report on a search for anomalous production of events with at least two charged, isolated, like-sign leptons with pT > 11 GeV/c using a 107 pb^-1 sample of 1.8 TeV ppbar collisions collected by the CDF detector. We define a signal region containing low background from Standard Model processes. To avoid bias, we fix the final cuts before examining the event yield in the signal region using control regions to test the Monte Carlo predictions. We observe no events in the signal region, consistent with an expectation of 0.63^(+0.84)_(-0.07) events. We present 95% confidence level limits on new physics processes in both a signature-based context as well as within a representative minimal supergravity (tanbeta = 3) model.