Search for resonance decays to lepton+jet at DESY HERA and limits on leptoquarks

Journal article

A search for narrow-width resonances that decay into electron+jet or neutrino+jet has been performed with the ZEUS detector at the DESY ep collider HERA operating at center-of-mass energies of 300 and 318 GeV. An integrated e+p luminosity of 114.8 pb-1 and e-p luminosity of 16.7 pb-1 were used. No evidence for any resonance was found. Limits were derived on the Yukawa coupling λ as a function of the mass of a hypothetical resonance that has arbitrary decay branching ratios into eq or vq. These limits also apply to squarks predicted by R-parity-violating supersymmetry. Limits for the production of leptoquarks described by the Buchmüller-Rückl-Wyler model were also derived for masses up to 400 GeV. For λ = 0.1, leptoquark masses up to 290 GeV are excluded.

Authors: Chekanov, S; Derrick, M; Krakauer, D; Loizides, J; Magill, S

• Journal: Physical Review D
• Volume: 68
• Issue: 5
• Pages: 520041-5200415
• Publication date: 2003-09-01
• ISSN: 0556-2821
• Language: English