Experimental constraints on a stringy SU(5)$\times$U(1) model

Abstract

We re-examine the phenomenological aspects of a recently proposed string-derived SU(5)$\times$U(1) one-parameter supergravity model, and explore the sensitivity of the model predictions to variations in the strong coupling and the string unification scale. We also perform an analysis of the constraints on the parameter space of the model in light of the recent Tevatron trilepton data and the LEP~1.5 chargino and slepton data. We obtain $m_{χ^\pm_1}\gsim70\GeV$, which excludes one-third of the parameter space of the model. The remainder of the parameter space should be probed by ongoing analyses of the Tevatron trilepton data and forthcoming LEP~2 runs.

12 pages, LaTeX, 4 figures (included) Slightly revised version to appear in Phys. Rev. D (May 1 issue); noted that trilepton searches cannot probe the full parameter space of the model because the leptons from neutralino decay become too soft to be detectable

References in corpus (10)

• Infrared Regularization of Superstring Theory and the One-Loop Calculation of Coupling Constants
• Searching for Invisible and Almost Invisible Particles at e^+e^- Colliders
• Precision Corrections to Supersymmetric Unification
• Gauge Coupling Unification in Realistic Free-Fermionic String Models
• Making Ends Meet: String Unification and Low-Energy Data
• Lowering alpha_s by flipping SU(5)
• Supersymmetry dileptons and trileptons at the Tevatron
• Search for ${\tilde{W}}_1{\tilde{Z}}_2$ Production via Trilepton Final States in $p\bar{p}$ collisions at $\sqrt{s}=1.8$ TeV
• A string no-scale supergravity model and its experimental consequences
• Vanishing Str M^2 in the presence of anomalous U_A(1)

Cited by in corpus (5)

• Classification of Flat Directions in Perturbative Heterotic Superstring Vacua with Anomalous U(1)
• Search for Chargino-Neutralino Associated Production at the Fermilab Tevatron Collider
• The Diboson Excesses in Leptophobic $U(1{)}_{\mathrm{LP}}$ Models from String Theories
• Search for Selectron and Squark Production in $e^{+}p$ Collisions at HERA
• String Unification and Leptophobic $Z^{\prime }$ in Flipped SU(5)