Searches for Extra Dimensions and for Heavy Resonances in Dilepton, Diphoton, Electron + Photon and Electron + Missing ET Final States with the D0 Detector

TL;DR

This paper reports on searches for new physics phenomena like extra dimensions, heavy resonances, and electron compositeness using high-mass dilepton and diphoton data from the D0 detector, setting improved limits due to no observed excess.

Contribution

First comprehensive search for multiple new physics signatures in high-mass dilepton and diphoton channels with the D0 detector, improving existing limits.

Findings

No significant excess observed in data

Limits on new physics models are improved

Results constrain theories of extra dimensions and heavy resonances

Abstract

The high mass spectrum of lepton and photon pairs is sensitive to a broad array of new physics. Examples include searches for extra dimensions in the dielectron and diphoton channels. A direct search for electron compositeness is possible in the production of excited electrons decaying into an electron and a photon. In addition, the electron plus missing transverse energy data sample can be searched for a W' boson. Latest results in searches in the high mass dielectron, diphoton, electron plus photon, and electron plus missing transverse energy channels obtained by the D0 experiment at the Tevatron are reported, using a data set corresponding to an integrated luminosity of about 1 inverse femtobarn. Since no significant excess is observed in the data in all cases, limits are set which improve on previous searches.