Abstract
A search for scalar and vector leptoquarks coupling to first generation fermions is performed in the H1 experiment at the ep collider HERA. The analysis uses e−p data collected in 1998 and 1999 at a centre-of-mass energy of 320 GeV, corresponding to an integrated luminosity of ∼15 pb−1. No evidence for the direct production of such particles is found in a data sample with a large transverse momentum final state electron or with large missing transverse momentum, and constraints on leptoquark models are established. For a Yukawa coupling of electromagnetic strength leptoquarks are excluded for masses up to ∼290 GeV. This analysis complements the leptoquark searches performed previously using data collected whilst HERA was operating with positrons instead of electrons.
Highlights
The ep collider HERA is ideally suited to search for resonant production of new particles possessing couplings to an electron–parton pair
No evidence for the direct production of such particles is found in a data sample with a large transverse momentum final state electron or with large missing transverse momentum, and constraints on leptoquark models are established
Collisions between electrons and protons provide a high sensitivity to LQs with fermion number F = 2 (i.e., LQs coupling to e− and a valence quark) while the production of such LQs is largely suppressed in e+p collisions where the interaction involves an antiquark
Summary
The ep collider HERA is ideally suited to search for resonant production of new particles possessing couplings to an electron–parton pair. A search for scalar and vector leptoquarks coupling to first generation fermions is performed in the H1 experiment at the ep collider HERA. For a Yukawa coupling of electromagnetic strength leptoquarks are excluded for masses up to ∼ 290 GeV.
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