Searches for New Physics at H1

TL;DR

This paper reports on searches for new particles like leptoquarks and excited fermions at HERA, setting new limits on their properties and extending the mass range excluded, with no evidence of their existence found.

Contribution

It provides the most comprehensive limits to date on leptoquarks, lepton flavor violation, and excited fermions using the full H1 data set.

Findings

No evidence for leptoquark or excited fermion production.

Extended exclusion limits to higher masses.

Constraints on Yukawa couplings and compositeness scale.

Abstract

Recent results of searches for leptoquarks, lepton flavour violating leptoquarks and excited fermions (electrons, neutrinos and quarks) with the H1 experiment at HERA are presented, which use up to the full ep H1 data set. No evidence for the direct or indirect production of such particles is found. The results are interpreted in terms of limits on the Yukawa coupling of leptoquarks and lepton flavour violating processes and for excited fermions on the ratio of the coupling parameter to the compositeness scale f/Lambda, mainly in the framework of gauge mediated interactions. The derived limits extend the excluded regions to higher masses than those reported in previous results.