Four generations: SUSY and SUSY breaking View Full Text


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Article Info

DATE

2010-03-06

AUTHORS

Rohini M. Godbole, Sudhir K. Vempati, Akın Wingerter

ABSTRACT

We revisit four generations within the context of supersymmetry. We compute the perturbativity limits for the fourth generation Yukawa couplings and show that if the masses of the fourth generation lie within reasonable limits of their present experimental lower bounds, it is possible to have perturbativity only up to scales around 1000 TeV. Such low scales are ideally suited to incorporate gauge mediated supersymmetry breaking, where the mediation scale can be as low as 10-20 TeV. The minimal messenger model, however, is highly constrained. While lack of electroweak symmetry breaking rules out a large part of the parameter space, a small region exists, where the fourth generation stau is tachyonic. General gauge mediation with its broader set of boundary conditions is better suited to accommodate the fourth generation. More... »

PAGES

23

References to SciGraph publications

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  • 2007-12-28. Electroweak symmetry breaking from a holographic fourth generation in JOURNAL OF HIGH ENERGY PHYSICS
  • 1986-06. Renormalization group equations for softly broken supersymmetry: The most general case in ZEITSCHRIFT FÜR PHYSIK C PARTICLES AND FIELDS
  • 2009-12-01. Phenomenology of pure general gauge mediation in JOURNAL OF HIGH ENERGY PHYSICS
  • 2009-09-28. Four statements about the fourth generation in PMC PHYSICS A
  • 2006-12-02. Is Vtb≃1? in EUROPEAN PHYSICAL JOURNAL C
  • 1981-06. Radiative quark mass generation and a fourth quark family in ZEITSCHRIFT FÜR PHYSIK C PARTICLES AND FIELDS
  • 2009-10-07. Natural fourth generation of leptons in JOURNAL OF HIGH ENERGY PHYSICS
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    http://scigraph.springernature.com/pub.10.1007/jhep03(2010)023

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    http://dx.doi.org/10.1007/jhep03(2010)023

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