Search for particles decaying into a Z boson and a photon in p\bar{p} collisions at \sqrt{s} = 1.96 TeV

TL;DR

This paper reports the first search for a new particle decaying into a Z boson and a photon in proton-antiproton collisions at 1.96 TeV, setting limits on production cross sections over a broad mass range.

Contribution

It introduces the first search for a Zγ-decaying particle in par{p} collisions at this energy, providing new constraints on such particles.

Findings

Limits on cross section times branching ratio range from 0.4 to 3.5 pb.

No significant excess observed, setting new bounds.

Search covers invariant masses from 100 to 1000 GeV/c².

Abstract

We present the results of the first search for a new particle X produced in $p\bar{p}$ collisions at \sqrt{s}=1.96 TeV and subsequently decaying to Z\gamma. The search uses 0.3 fb$^{-1}$ of data collected with the D{\O}detector at the Fermilab Tevatron Collider. We set limits on the production cross section times the branching fraction $\sigma(p \bar{p} \to X) \times B(X\to Z\gamma)$ that range from 0.4 -- 3.5 pb at the 95% C.L. for $X$ with invariant masses between 100 and 1000 GeV/$c^2$ over a wide range of $X$ decay widths.