Search for New High Mass Particles Decaying to Lepton Pairs in pbarp Collisions at sqrt(s)=1.96 TeV

TL;DR

This paper reports a search for high-mass particles decaying into lepton pairs using Fermilab Tevatron data, setting limits on production cross sections and mass bounds for potential new particles beyond the Standard Model.

Contribution

It provides the first limits on new high-mass particles decaying to leptons at 1.96 TeV, including bounds on models with heavy neutral gauge bosons.

Findings

Limits on sigma*BR are about 25 fb for masses above 600 GeV/c^2.

Lower mass bounds for new particles are established based on the data.

Constraints on models beyond the Standard Model are derived.

Abstract

A search for new particles (X) that decay to electron or muon pairs has been performed using approximately 200 pb**(-1) of pbarp collision data at sqrt(s)=1.96 TeV collected by the CDF II experiment at the Fermilab Tevatron. Limits on sigma(ppbar -> X)*BR(X -> ll) are presented as a function of dilepton invariant mass m(ll) > 150 GeV/c**2, for different spin hypotheses (0, 1, or 2). The limits are approximately 25 fb for m(ll) > 600 GeV/c**2. Lower mass bounds for X from representative models beyond the Standard Model including heavy neutral gauge bosons are presented.