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Signals for supersymmetry at HERA

Technical Report:

Abstract

We consider the baryon parity signals at HERA for the case of the MSSM production mechanisms and the decays via the lepton number violating couplings L{sub i}Q anti D. We can probe very small Yukawa couplings {lambda}`> or {approx}3.10{sup -6}, limited only by the decay length of the LSP. We assume the LSP to be the lightest neutralino and study its decays in detail. We present the matrix element squared for the tree-level decay amplitude of a generally mixed neutralino explicitly. We find that the branching fraction to charged leptons strongly depends on the SUSY parameters and can differ significantly from the naively expected 50%. The SUSY mass reaches of the studied processes in the ZEUS detector at HERA were found to be: (m(e, anti {nu})+m( anti q)) {<=} 170 GeV, 195 GeV and 205 GeV for the L{sub t}Q anti D, L{sub {mu}}Q anti D and L{sub e}Q anti D couplings respectively. These are well above existing limits on R-parity violating (R{sub p}) SUSY from previous experiments. We conclude that HERA offers a very promising discovery potential for R{sub p} SUSY. (orig.)
Authors:
Dreiner, H; [1]  Morawitz, P [2] 
  1. Eidgenoessische Technische Hochschule, Zurich (Switzerland). Inst. fuer Theoretische Physik
  2. Oxford Univ. (United Kingdom). Dept. of Physics
Publication Date:
Jul 01, 1994
Product Type:
Technical Report
Report Number:
DESY-94-127
Reference Number:
SCA: 662330; PA: DEN-94:0FM225; EDB-95:018037; SN: 95001304997
Resource Relation:
Other Information: PBD: Jul 1994
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ELECTRON-PROTON INTERACTIONS; SEMI-INCLUSIVE INTERACTIONS; SUPERSYMMETRY; GEV RANGE 100-1000; LEPTON NUMBER; ELECTRONS; REST MASS; SYMMETRY BREAKING; STANDARD MODEL; COUPLING; YUKAWA NONLOCAL THEORY; SPARTICLES; NEUTRAL PARTICLES; MATRIX ELEMENTS; DECAY AMPLITUDES; BRANCHING RATIO; LIMITING VALUES; QUARKS; INTEGRAL CROSS SECTIONS; LIFETIME; ELECTRON-QUARK INTERACTIONS; INELASTIC SCATTERING; TAU PARTICLES; TAU NEUTRINOS; MULTIPLE PRODUCTION; JET MODEL; BACKGROUND RADIATION; PAIR PRODUCTION; ELECTROPRODUCTION; BEAUTY PARTICLES; TOP PARTICLES; W PLUS BOSONS; LEPTONIC DECAY; POSITRONS; MUONS PLUS; THEORETICAL DATA; TRANSVERSE MOMENTUM; TRANSVE...; 662330; PHOTON AND CHARGED-LEPTON INTERACTIONS WITH HADRONS
OSTI ID:
10105118
Research Organizations:
Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
Country of Origin:
Germany
Language:
English
Other Identifying Numbers:
Journal ID: ISSN 0418-9833; Other: ON: DE95725665; TRN: DE94FM225
Availability:
OSTI; NTIS (US Sales Only); INIS
Submitting Site:
DEN
Size:
36 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Dreiner, H, and Morawitz, P. Signals for supersymmetry at HERA. Germany: N. p., 1994. Web.
Dreiner, H, & Morawitz, P. Signals for supersymmetry at HERA. Germany.
Dreiner, H, and Morawitz, P. 1994. "Signals for supersymmetry at HERA." Germany.
@misc{etde_10105118,
title = {Signals for supersymmetry at HERA}
author = {Dreiner, H, and Morawitz, P}
abstractNote = {We consider the baryon parity signals at HERA for the case of the MSSM production mechanisms and the decays via the lepton number violating couplings L{sub i}Q anti D. We can probe very small Yukawa couplings {lambda}`> or {approx}3.10{sup -6}, limited only by the decay length of the LSP. We assume the LSP to be the lightest neutralino and study its decays in detail. We present the matrix element squared for the tree-level decay amplitude of a generally mixed neutralino explicitly. We find that the branching fraction to charged leptons strongly depends on the SUSY parameters and can differ significantly from the naively expected 50%. The SUSY mass reaches of the studied processes in the ZEUS detector at HERA were found to be: (m(e, anti {nu})+m( anti q)) {<=} 170 GeV, 195 GeV and 205 GeV for the L{sub t}Q anti D, L{sub {mu}}Q anti D and L{sub e}Q anti D couplings respectively. These are well above existing limits on R-parity violating (R{sub p}) SUSY from previous experiments. We conclude that HERA offers a very promising discovery potential for R{sub p} SUSY. (orig.)}
place = {Germany}
year = {1994}
month = {Jul}
}