Seminar Maria E. Cabrera

Maria E. Cabrera
GRAPPA, Amsterdam
The health of SUSY after the Higgs discovery and the XENON100 data
We analyze the implications for the status and prospects of  
supersymmetry of the Higgs discovery and the last XENON data. We focus  
mainly, but not only, on the CMSSM and NUHM models. Using a Bayesian  
approach we determine the distribution of probability in the parameter  
space of these scenarios. This shows that, most probably, they are now  
beyond the LHC reach . This negative chances increase further (at more  
than 95\% c.l.) if one includes dark matter constraints in the  
analysis, in particular the last XENON100 data. However, the models  
would be probed completely by XENON1T. The mass of the LSP neutralino  
gets essentially fixed around 1 TeV. We do not incorporate ad hoc  
measures of the fine-tuning to penalize unnatural possibilities: such  
penalization arises automatically from the careful Bayesian analysis  
itself, and allows to scan the whole parameter space. In this way, we  
can explain and resolve the apparent discrepancies between the  
previous results in the literature. Although SUSY has become hard to  
detect at LHC, this does not necessarily mean that is very fine-tuned.  
We use Bayesian techniques to show the experimental Higgs mass is at  
$ \sim 2\ \sigma $ off the supersymmetric expectation. This is  
substantial but not dramatic. Although the CMSSM or the NUHM are  
unlikely to show up at the LHC, they are still interesting and  
plausible models after the Higgs observation; and, if they are true,  
the chances of discovering them in future dark matter experiments are  
quite high.
Thursday, May 23, 2013 - 12:30