Thursday, March 22, 2012

1111.6547 (Stefan Antusch et al.)

Naturalness and GUT Scale Yukawa Coupling Ratios in the CMSSM    [PDF]

Stefan Antusch, Lorenzo Calibbi, Vinzenz Maurer, Maurizio Monaco, Martin Spinrath
We analyse the fine-tuning in the Constrained Minimal Supersymmetric Standard Model (CMSSM) in the light of the present and expected ATLAS and CMS SUSY searches. Even with 10/fb of data and no discovery of SUSY valid regions might remain with fine-tuning less than 20. Moreover we investigate the fine-tuning price of GUT scale Yukawa coupling relations. Considering a 2$\sigma$ constraint for $(g-2)_\mu$ and fine-tuning less than 30 yields an allowed range of $y_\tau/y_b = [1.31,1.70]$, which points towards the alternative GUT prediction $y_\tau/y_b = 3/2$. Relaxing the $(g-2)_\mu$ constraint to 5$\sigma$ extends the possible region to [1.02,1.70], allowing for approximate $b-\tau$ Yukawa coupling unification.
View original: http://arxiv.org/abs/1111.6547

No comments:

Post a Comment