Search for Z'--> e^+e^- Using Dielectron Mass and Angular Distribution

TL;DR

This paper searches for Z' bosons in dielectron events at Fermilab, using mass and angular distributions, but finds no evidence and sets limits on Z' properties across various models.

Contribution

It introduces a combined analysis of invariant mass and angular distributions to improve Z' boson search sensitivity in proton-antiproton collisions.

Findings

No Z' signal observed within dataset

95% confidence level lower limits set on Z' mass

Constraints placed on Z' gauge coupling and contact interaction scales

Abstract

We search for Z' bosons in dielectron events produced in ppbar collisions at sqrt{s}=1.96 TeV, using a 0.45 fb^(-1) dataset accumulated with the CDF II detector at the Fermilab Tevatron. To identify the Z' --> e^+e^- signal, both the dielectron invariant mass distribution and the angular distribution of the electron pair are used. No evidence of a signal is found, and 95% confidence level lower limits are set on the Z' mass for several models. Limits are also placed on the mass and gauge coupling of a generic Z', as well as on the contact interaction mass scales for different helicity structure scenarios.