skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Gauge Mediation Simplified

Abstract

Gauge mediation of supersymmetry breaking is drastically simplified using generic superpotentials without U(1){sub R} symmetry by allowing metastable vacua.

Authors:
;  [1]
  1. Department of Physics, University of California, Berkeley, California 94720 (United States) and Theoretical Physics Group, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)
Publication Date:
OSTI Identifier:
20951229
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 98; Journal Issue: 15; Other Information: DOI: 10.1103/PhysRevLett.98.151803; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; GAUGE INVARIANCE; POTENTIALS; SUPERSYMMETRY; SYMMETRY BREAKING; U-1 GROUPS

Citation Formats

Murayama, Hitoshi, and Nomura, Yasunori. Gauge Mediation Simplified. United States: N. p., 2007. Web. doi:10.1103/PHYSREVLETT.98.151803.
Murayama, Hitoshi, & Nomura, Yasunori. Gauge Mediation Simplified. United States. doi:10.1103/PHYSREVLETT.98.151803.
Murayama, Hitoshi, and Nomura, Yasunori. Fri . "Gauge Mediation Simplified". United States. doi:10.1103/PHYSREVLETT.98.151803.
@article{osti_20951229,
title = {Gauge Mediation Simplified},
author = {Murayama, Hitoshi and Nomura, Yasunori},
abstractNote = {Gauge mediation of supersymmetry breaking is drastically simplified using generic superpotentials without U(1){sub R} symmetry by allowing metastable vacua.},
doi = {10.1103/PHYSREVLETT.98.151803},
journal = {Physical Review Letters},
number = 15,
volume = 98,
place = {United States},
year = {Fri Apr 13 00:00:00 EDT 2007},
month = {Fri Apr 13 00:00:00 EDT 2007}
}
  • We show a calculable example of stable supersymmetry (SUSY) breaking modelswith O(10) eV gravitino mass based on the combination of D-term gauge mediationand U(1)' mediation. A potential problem of the negative mass squared for theSUSY standard model (SSM) sfermions in the D-term gauge mediation is solvedby the contribution from the U(1)' mediation. On the other hand, the splittingbetween the SSM gauginos and sfermions in the U(1)' mediation iscircumvented bythe contributions from the D-term gauge mediation. Since the U(1)' mediation doesnot introduce any new SUSY vacua, we achieve a completely stable model underthermal effects. Our model, therefore, has no cosmological difficulty.
  • A striking consequence of supersymmetry breaking communicated purely via the superconformal anomaly is that the gaugino masses are proportional to the gauge {beta} functions. This result, however, is not unique to anomaly mediation. We present examples of ''generalized'' gauge-mediated models with messengers in standard model representations that give nearly identical predictions for the gaugino masses, but positive (mass){sup 2} for all sleptons. There are remarkable similarities between an anomaly-mediated model with a small additional universal mass added to all scalars and the gauge-mediated models with a long-lived W-ino next-to-lightest supersymmetric particle, leading to only a small set of observables thatmore » provide robust distinguishing criteria. These include ratios of the heaviest to lightest selectrons, smuons, and top squarks. The sign of the gluino soft mass is an unambiguous distinction, but requires measuring a difficult class of one-loop radiative corrections to sparticle interactions. A high precision measurement of the Higgs-boson-b-b(bar sign) coupling is probably the most promising interaction from which this sign might be extracted. (c) 2000 The American Physical Society.« less
  • Direct gauge mediation models using the Intriligator-Seiberg-Shih metastable vacua suffer from the Landau pole problem of the standard-model gauge couplings and the existence of R-symmetry forbidding gaugino masses. These problems may be solved by using the recently proposed supersymmetry (SUSY)-breaking models in a conformal window of the vectorlike SU(N{sub C}) gauge theory with gauge singlets. In this paper we propose a model of gauge mediation based on the SUSY-breaking model in the conformal window, and study the dynamics for SUSY breaking. In this model, there are massive vectorlike bifundamental fields charged under both SU(N{sub C}) and the standard-model gauge group,more » and our model can be regarded as a semidirect gauge mediation model. The color number N{sub C} can be small to avoid the Landau pole problem, and R symmetry is also broken under a reasonable assumption on the strong dynamics of the model. The model possesses only one free parameter, and the gaugino and sfermion masses are naturally of the same order.« less
  • We study the cosmology of supersymmetric models in which the supersymmetry-breaking effects are mediated by gauge interactions at about the 10{sup 5} GeV scale. We first point out that the gravitino is likely to overclose the Universe in this class of models. This requires an entropy production, which prefers a baryogenesis mechanism at a relatively low temperature. The Affleck-Dine mechanism for baryogenesis is one of the possibilities to generate enough baryon asymmetry, but the analysis is nontrivial since the shape of the potential for the flat direction differs substantially from the conventional hidden sector case. To see this, we firstmore » perform a two-loop calculation to determine the shape of the potential. By combining the potential with the supergravity contribution, we then find that the Affleck-Dine baryogenesis works efficiently to generate sufficient baryon asymmetry. On the other hand, we also point out that string moduli fields, if present, are stable and their coherent oscillations overclose the Universe by more than 15 orders of magnitude. One needs a very late inflationary period with an e-folding of N{approx_gt}5 and an energy density of {approx_lt}(10{sup 7} GeV){sup 4}. A thermal inflation is enough for this purpose. Fortunately, the Affleck-Dine baryogenesis is so efficient that enough baryon asymmetry can survive the late inflation. {copyright} {ital 1997} {ital The American Physical Society}« less