Weak-scale phenomenology of models with gauge-mediated supersymmetry breaking

Journal Article · Sat Mar 01 00:00:00 EST 1997 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/physrevd.55.3188· OSTI ID:1447571

Bagger, Jonathan A. ^[1]; Matchev, Konstantin T. ^[1]; Pierce, Damien M. ^[2]; Zhang, Ren-Jie ^[1]

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1. Johns Hopkins Univ., Baltimore, MD (United States)
2. Stanford Univ., CA (United States)

We study in some detail the spectral phenomenology of models in which supersymmetry is dynamically broken and transmitted to the supersymmetric partners of the quarks, leptons, and gauge bosons, and the Higgs bosons themselves, via the usual gauge interactions. We elucidate the parameter space of what we consider to be the minimal model, and explore the regions which give rise to consistent radiative electroweak symmetry breaking. We include the weak-scale threshold corrections, and show how they considerably reduce the scale dependence of the results. We examine the sensitivity of our results to unknown higher-order messenger-sector corrections. We compute the superpartner spectrum across the entire parameter space, and compare it to that of the minimal supergravity-inspired model. We delineate the regions where the lightest neutralino or t slepton is the next-to-lightest supersymmetric particle, and compute the lifetime and branching ratios of the NLSP. In contrast with the minimal supergravity-inspired model, we find that the lightest neutralino can have a large Higgsino component, of order 50%. Nevertheless, the neutralino branching fraction to the gravitino and the light Higgs boson remains small, ≲10^-4, so the observation of such a decay would point to a nonminimal Higgs sector.

• Research Organization: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• Grant/Contract Number: AC02-76SF00515
• OSTI ID: 1447571
• Alternate ID(s): OSTI ID: 467564
• Report Number(s): SLAC-PUB--3544
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 5 Vol. 55; ISSN 0556-2821
• Publisher: American Physical Society (APS)
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS