Physics with Single Photons plus Missing Energy Final States at D0

TL;DR

This paper reports the first observation of Zgamma to nunu_bargamma at the Tevatron, setting new limits on anomalous couplings and searching for Kaluza Klein gravitons using single photon plus missing energy signatures.

Contribution

It presents the first observation of a specific Zgamma process and new limits on anomalous couplings, along with a search for Kaluza Klein gravitons at D0.

Findings

First observation of Zgamma to nunu_bargamma at 5.1 sigma

New limits on anomalous ZZgamma and Zgammagamma couplings

Search results for Kaluza Klein gravitons with single photons

Abstract

Final state signatures of a single photon and missing transverse energy offer unique and powerful advantages in the search for new physics. This document presents the first observation of the Zgamma to nunu_bargamma process at the Tevatron Collider at 5.1 standard deviations significance, as well as some of the strongest limits on anomalous trilinear ZZgamma and Zgammagamma couplings to date. Additionally, we present the latest D0 results on a search for direct production of Kaluza Klein gravitons in association with single photons.