Can HERA see an eu r arrow ec signal of a virtual leptoquark

Journal Article · Sun Nov 01 04:00:00 EST 1992 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.46.3757· OSTI ID:7197939

Leurer, M ^[1]

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1. Department of Nuclear Physics, The Weizmann Institute, Rehovot 76100 (Israel)

Virtual leptoquarks could be detected at the DESY {ital ep} collider HERA through some nonstandard effects. Here we explore the possibility that virtual leptoquarks could be discovered via {ital eu}{r arrow}{ital ec} scattering, assuming an integrated luminosity of 200 pb{sup {minus}1} and charm identification efficiency of 1%. We study the implications of low-energy data for the leptoquark couplings and find that the most relevant bound for the HERA cross sections comes from inclusive {ital c}{r arrow}{ital e}{sup +}{ital e{minus}}+any. This bound implies that the {ital eu}{r arrow}{ital ec} cross sections for virtual leptoquarks are just too small for observation of the signal. With an improvement by a factor of {similar to}2 on the luminosity or on the charm identification it could be possible to see virtual leptoquarks with {ital maximum} {ital couplings} up to {similar to}1.5--2 TeV. However, the prospects for discovering the virtual particles if their couplings are somewhat below present bounds are very dim. We point out that this cross section could be very large for leptoquarks lighter than HERA's kinematical limit, and if such a leptoquark is discovered we recommend searching for a possible {ital eu}{r arrow}{ital ec} signal. Our results may also serve as an update on the maximum cross sections for leptoquark-mediated {ital eu}{r arrow}{mu}{ital c} scattering.

• OSTI ID: 7197939
• Journal Information: Physical Review, D (Particles Fields); (United States), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 46:9; ISSN PRVDA; ISSN 0556-2821
• Country of Publication: United States
• Language: English

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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ALGEBRAIC CURRENTS
ANTILEPTONS
ANTIMATTER
ANTIPARTICLES
BRANCHING RATIO
CHARM PARTICLES
COMPOSITE MODELS
COUPLING
CROSS SECTIONS
CURRENTS
DECAY
ELECTRON-NUCLEON INTERACTIONS
ELECTRON-PROTON INTERACTIONS
ELECTRONS
ELEMENTARY PARTICLES
FERMIONS
FLAVOR MODEL
HERA STORAGE RING
INCLUSIVE INTERACTIONS
INTERACTIONS
LEPTON-BARYON INTERACTIONS
LEPTON-HADRON INTERACTIONS
LEPTON-NUCLEON INTERACTIONS
LEPTONS
LUMINOSITY
MATHEMATICAL MODELS
MATTER
NEUTRAL CURRENTS
OPTICAL PROPERTIES
PARTICLE IDENTIFICATION
PARTICLE INTERACTIONS
PARTICLE MODELS
PARTICLE PRODUCTION
PHYSICAL PROPERTIES
POSITRONS
POSTULATED PARTICLES
Pa
Particle Systematics-- Unified Theories & Models-- (1992-)
QUARK MODEL
QUARKS
SCATTERING
STANDARD MODEL
STORAGE RINGS
UNIFIED GAUGE MODELS
VIRTUAL PARTICLES