TL;DR
This paper reports on searches for new physics beyond the Standard Model at HERA, finding no significant deviations but setting new exclusion limits, while also noting an intriguing excess of certain events that could hint at new phenomena.
Contribution
It presents the latest search results at HERA for various beyond Standard Model scenarios, including new exclusion limits and an unusual event excess.
Findings
No significant deviations from the Standard Model were observed.
Exclusion limits were set for contact interactions, extra dimensions, leptoquarks, and other phenomena.
An excess of high $P_t$ isolated lepton events was observed, suggesting potential new physics.
Abstract
Searches for physics beyond the Standard Model have been performed in high-energy collisions at HERA. No significant deviation from the Standard Model has been observed while searching for contact interactions, extra dimensions, leptoquarks, R-parity violating squarks and excited fermions. Exclusion limits have been inferred which extend or complement bounds from other colliders. The H1 collaboration has observed a puzzling excess of events with an high isolated lepton and missing transverse momentum, and interpretation as flavour changing neutral currents has been explored.
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