Flavor mediation delivers natural SUSY
Autor: | Jesse Thaler, Matthew McCullough, Nathaniel Craig |
---|---|
Přispěvatelé: | Massachusetts Institute of Technology. Center for Theoretical Physics, Massachusetts Institute of Technology. Department of Physics, Thaler, Jesse, McCullough, Matthew P. |
Jazyk: | angličtina |
Rok vydání: | 2012 |
Předmět: |
Physics
Nuclear and High Energy Physics Particle physics 010308 nuclear & particles physics Physics beyond the Standard Model High Energy Physics::Lattice Scalar (mathematics) High Energy Physics::Phenomenology FOS: Physical sciences Superpartner Hierarchy problem Supersymmetry 01 natural sciences Custodial symmetry Symmetry (physics) High Energy Physics - Phenomenology High Energy Physics::Theory High Energy Physics - Phenomenology (hep-ph) 0103 physical sciences High Energy Physics::Experiment 010306 general physics Gauge symmetry |
Zdroj: | arXiv |
Popis: | 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. United States. Dept. of Energy (cooperative research agreement DE-FG02- 05ER-41360) United States. Dept. of Energy (Early Career research program DE-FG02-11ER-41741) Massachusetts Institute of Technology (Simons Postdoctoral Fellowship) National Science Foundation (U.S.) (NSF grant PHY-0907744) Institute for Advanced Study (Princeton, N.J.) |
Databáze: | OpenAIRE |
Externí odkaz: |