Search for First Generation Leptoquarks in ep Collisions at HERA

Understand

A search for first generation scalar and vector leptoquarks produced in ep collisions is performed by the H1 Collaboration at HERA.

• The full H1 data sample is used in the analysis, corresponding to an integrated luminosity 446 pb^-1.
• No evidence for the production of leptoquarks is observed in final states with a large transverse momentum electron or with large missing transverse momentum, and constraints on leptoquark models are derived.
• For leptoquark couplings of electromagnetic strength lambda=0.3, first generation leptoquarks with masses up to 800 GeV are excluded at 95% confidence level.