SUSY signals at DESY HERA in the no-scale flipped SU(5) supergravity model

Journal Article · Mon Nov 01 04:00:00 EST 1993 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.48.4029· OSTI ID:5717672

Lopez, J L; Nanopoulos, D V; Wang, X; Zichichi, A ^[1]

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1. Center for Theoretical Physics, Department of Physics, Texas A M University, College Station, Texas 77843-4242 (United States) Astroparticle Physics Group, Houston Advanced Research Center (HARC), The Woodlands, Texas 77381 (United States) CERN, Geneva (Switzerland)

Sparticle production and detection at DESY HERA are studied within the recently proposed no-scale flipped SU(5) supergravity model. Among the various reaction channels that could lead to sparticle production at HERA, only the following are within its limit of sensitivity in this model: [ital e][sup [minus]][ital p][r arrow][ital [tilde e]][sub [ital L],][ital R][sup [minus]][chi][sub [ital i]][sup 0]+[ital X],[tilde [nu]][sub [ital e]][chi][sub 1][sup [minus]]+[ital X], where [chi][sub [ital i]][sup 0] ([ital i]=1,2) are the two lightest neutralinos and [chi][sub 1][sup [minus]] is the lightest chargino. We study the elastic and deep-inelastic contributions to the cross sections using the Weizsaecker-Williams approximation. We find that the most promising supersymmetric production channel is right-handed selectron ([ital [tilde e]][sub [ital R]]) plus first neutralino ([chi][sub 1][sup 0]), with one hard electron and missing energy signature. The [tilde [nu]][sub [ital e]][chi][sub 1][sup [minus]] channel leads to comparable rates but may also allow jet final states. A right-handedly polarized electron beam at HERA would shut off the latter channel and allow preferentially the former one. With an integrated luminosity of [ital scrL]=100 pb[sup [minus]1], HERA may be able to extend the present CERN LEP I lower bounds on [ital m][sub [ital [tilde e]][ital R]], [ital m][sub n][tilde u][ital e], [ital m][sub [chi]1][sup 0] by [approx]15--20 GeV, while [ital scrL]=1000 pb[sup [minus]1] would make HERA competitive with LEP II. We also show that the Leading Proton Spectrometer at HERA is an excellent supersymmetry detector which can provide indirect information about the sparticle masses by measuring the leading proton longitudinal momentum distribution.

• DOE Contract Number: FG05-91ER40633
• OSTI ID: 5717672
• Journal Information: Physical Review, D (Particles Fields); (United States), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 48:9; ISSN 0556-2821; ISSN PRVDAQ
• Country of Publication: United States
• Language: English

Related Subjects

662210 -- Specific Theories & Interaction Models
662330 -- Photon & Charged-Lepton Interactions with Hadrons-- (1992)
662440* -- Properties of Other Particles Including Hypothetical Particles-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BEAMS
CROSS SECTIONS
DEEP INELASTIC SCATTERING
DETECTION
ELASTIC SCATTERING
FIELD THEORIES
INELASTIC SCATTERING
INTERACTIONS
JETS
LEPTON-BARYON INTERACTIONS
LEPTON-HADRON INTERACTIONS
LEPTON-NUCLEON INTERACTIONS
LIE GROUPS
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
POLARIZED BEAMS
Pa
Particle Systematics-- Unified Theories & Models-- (1992-)
SCATTERING
SU GROUPS
SU-5 GROUPS
SUPERGRAVITY
SUPERSYMMETRY
SYMMETRY
SYMMETRY GROUPS
UNIFIED-FIELD THEORIES