Searches for Leptoquarks, Squarks in $\not R_p$ SUSY and Excited Fermions at HERA

TL;DR

This paper reviews searches for new particles like leptoquarks, squarks, and excited fermions at HERA, finding no evidence but setting new limits on their properties compared to other experiments.

Contribution

It provides the first comprehensive review of HERA's searches for these particles and compares the resulting limits with other collider and low-energy experiments.

Findings

No evidence for new particles was observed.

Stringent mass and coupling limits were set for leptoquarks, squarks, and excited fermions.

Results are compared with limits from LEP, Tevatron, and low-energy experiments.

Abstract

Various searches for leptoquarks, scalar quarks in $R_p$-violating supersymmetric models, and excited fermions performed by the HERA experiments H1 and ZEUS are reviewed. No evidence for new particle production was observed from data collected by both experiments since 1994 in either electron-proton and positron-proton collisions. Stringent limits derived on the masses and couplings of these new particles are compared whenever appropriate with those from LEP, the Tevatron and low energy experiments.