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Four generations: SUSY and SUSY breaking

Godbole, Rohini M and Vempati, Sudhir K and Wingerter, Akin (2010) Four generations: SUSY and SUSY breaking. In: Journal of High Energy Physics (3). pp. 1-24.

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We revisit four generations within the context of supersymmetry. Wecompute 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.

Item Type: Journal Article
Publication: Journal of High Energy Physics
Publisher: Institute of Physics
Additional Information: Copyright of this article belongs to Institute of Physics.
Keywords: Supersymmetry Phenomenology
Department/Centre: Division of Physical & Mathematical Sciences > Centre for High Energy Physics
Date Deposited: 11 May 2010 10:51
Last Modified: 19 Sep 2010 06:06
URI: http://eprints.iisc.ac.in/id/eprint/27705

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