Search for New Physics with a Dijet plus Missing Transverse Energy Signature in p-pbar Collisions at sqrt(s) = 1.96 TeV

TL;DR

This study searches for new physics signals in proton-antiproton collisions by analyzing dijet events with missing transverse energy, setting limits on leptoquark masses and finding no evidence of non-standard model processes.

Contribution

The paper conducts a signature-based search for new physics in dijet plus missing energy events at the Tevatron, providing new constraints on scalar leptoquark masses.

Findings

No significant excess over the standard model prediction.

Set a 95% confidence level upper limit on cross section times acceptance.

Excluded scalar leptoquarks with masses below 187 GeV/c^2.

Abstract

We present results of a signature-based search for new physics using a dijet plus missing transverse energy data sample collected in 2 fb-1 of p-pbar collisions at sqrt(s) = 1.96 TeV with the CDF II detector at the Fermilab Tevatron. We observe no significant event excess with respect to the standard model prediction and extract a 95% C.L. upper limit on the cross section times acceptance for a potential contribution from a non-standard model process. Based on this limit the mass of a first or second generation scalar leptoquark is constrained to be above 187 GeV/c^2.