Search for Excited Fermions with the H1 Detector

TL;DR

This paper reports a search for excited fermions at HERA, analyzing data from 1994, finding no evidence of their existence, and setting new exclusion limits on their properties.

Contribution

It introduces a comprehensive search for excited electrons, neutrinos, and quarks using H1 detector data, covering multiple decay channels and establishing new exclusion limits.

Findings

No evidence for excited fermions was observed.

Exclusion limits were set on excited fermion production.

The analysis covered various decay modes of excited particles.

Abstract

We present a search for excited electrons, neutrinos and quarks using the H1 detector at the $ep$ collider HERA, based on data taken in 1994 with an integrated luminosity of 2.75 pb$^{-1}$. Radiative decays of excited quarks and neutrinos have been investigated as well as decays of excited electrons into all possible electroweak gauge bosons. No evidence for new particle production is found and exclusion limits are derived.