Exotic Physics at HERA

TL;DR

This paper reports on various searches for exotic physics phenomena at HERA, including excited neutrinos and doubly charged Higgs, using extensive ep collision data, but finds no significant deviations from the Standard Model.

Contribution

It provides comprehensive searches for exotic particles and high-Pt phenomena at HERA with the full dataset collected over more than a decade.

Findings

No significant deviations from the Standard Model observed.

Constraints set on exotic particle production.

Results contribute to the understanding of high-energy ep collisions.

Abstract

A search for excited neutrinos, the analysis of multi-lepton final states, a search for doubly charged Higgs production and a general search for high-Pt phenomena at HERA are reported. The searches use data samples of ep collisions with a centre-of-mass energy sqrt(s)=320 GeV collected by the H1 and ZEUS experiments at HERA in the years 1994-2005 with integrated luminosities up to 296 pb^-1. Overall no significant deviations of the experimental observations from the Standard Model (SM) expectation are found.