A Search for Leptoquarks at HERA

Simple item page
dc.creatorH1 Collaboration
dc.creatoral, S. Aid et
dc.date1995-12-01
dc.date.accessioned2026-07-07T11:46:41Z
dc.date.available2026-07-07T11:46:41Z
dc.descriptionA search for leptoquarks at HERA was performed in H1 using 1994 $e^+ p$ 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 $e^-p$ data, exclusion limits are considerably improved for leptoquarks which could be produced via $e^+$-{\it valence~quark} 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 $\sqrt{ 4 πα_{em}}$. 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 $\sqrt{ 4 πα_{em}}$. 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.
dc.description16 pages, latex, 4 figures appended as uuencoded file
dc.identifierhttps://arxiv.org/abs/hep-ex/9512001
dc.identifierhttp://arxiv.org/abs/hep-ex/9512001
dc.identifierPhys.Lett.B369:173-185,1996
dc.identifierdoi:10.1016/0370-2693(95)01601-5
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/202313
dc.subjectHigh Energy Physics - Experiment
dc.titleA Search for Leptoquarks at HERA
dc.typetext

Files

Collections

arXiv