A Search for leptoquarks at HERA

Collaboration
Dec, 1995
16 pages
Published in:
  • Phys.Lett.B 369 (1996) 173-185
e-Print:
Report number:
  • DESY-95-233
Experiments:

Citations per year

1996200220082014202005101520
Abstract:
A search for leptoquarks at HERA was performed in H1 using 1994 e +pe~+ p data corresponding to an integrated luminosity of about 3 \pb~{-1}. Single leptoquarks were searched for in direct positron-quark fusion processes taking into account possible decays into lepton-quark pairs of either the first, the second, or the third generation. No significant deviation from the Standard Model predictions is found in the various final states studied and mass dependent exclusion limits are derived on the Yukawa couplings of the leptoquarks. Compared with earlier results from an analysis of e pe~-p data, exclusion limits are considerably improved for leptoquarks which could be produced via e +e~+-{\it valencequark} fusion. For leptoquarks with lepton flavour conserving couplings, masses up to 275 \GeV (depending on the leptoquark type) are excluded for coupling values larger than 4παem\sqrt{ 4 \pi \alpha_{em}}. For leptoquarks with lepton flavour violating couplings, masses up to 225 \GeV are excluded for the first time in a direct search for couplings with leptons of the second or third generation larger than 4παem\sqrt{ 4 \pi \alpha_{em}}. Fourteen possible combinations of couplings are studied and stringent exclusion limits comparable or better than any existing direct or indirect limits are obtained for each leptoquark type.
Note:
  • 16 pages, latex, 4 figures appended as uuencoded file Report-no: DESY 95-233
  • positron p: colliding beams
  • colliding beams: positron p
  • positron p: deep inelastic scattering
  • deep inelastic scattering: positron p
  • search for: leptoquark
  • fusion: positron quark
  • coupling: leptoquark
  • leptoquark: coupling
  • coupling: Yukawa
  • Yukawa: coupling