Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2012-03-07
Physics
High Energy Physics
High Energy Physics - Phenomenology
17 pages, 7 figures, 2 tables. v2 references added, minor changes to flavor constraints and a little discussion added
Scientific paper
If supersymmetry (SUSY) solves the hierarchy problem, then naturalness considerations coupled with recent LHC bounds require non-trivial superpartner flavor structures. Such "Natural SUSY" models exhibit a large mass hierarchy between scalars of the third and first two generations as well as degeneracy (or alignment) among the first two generations. In this work, we show how this specific beyond the standard model (SM) flavor structure can be tied directly to SM flavor via "Flavor Mediation". The SM contains an anomaly-free SU(3) flavor symmetry, broken only by Yukawa couplings. By gauging this flavor symmetry in addition to SM gauge symmetries, we can mediate SUSY breaking via (Higgsed) gauge mediation. This automatically delivers a natural SUSY spectrum. Third-generation scalar masses are suppressed due to the dominant breaking of the flavor gauge symmetry in the top direction. More subtly, the first-two-generation scalars remain highly degenerate due to a custodial U(2) symmetry, where the SU(2) factor arises because SU(3) is rank two. This custodial symmetry is broken only at order (m_c/m_t)^2. SUSY gauge coupling unification predictions are preserved, since no new charged matter is introduced, the SM gauge structure is unaltered, and the flavor symmetry treats all matter multiplets equally. Moreover, the uniqueness of the anomaly-free SU(3) flavor group makes possible a number of concrete predictions for the superpartner spectrum.
Craig Nathaniel
McCullough Matthew
Thaler Jesse
No associations
LandOfFree
Flavor Mediation Delivers Natural SUSY does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Flavor Mediation Delivers Natural SUSY, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Flavor Mediation Delivers Natural SUSY will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-15790