Wednesday, August 17, 2011

Higgs, Binos and Gluinos: Split Susy Within Reach

I put out a paper today on interpreting anomalies at the LHC and Tevatron that could be hints of a Higgs boson.   It's always dangerous to be out in front of the bus, but it's better than missing the bus altogether.  

We did 3 things in this paper.

  1. Reviewed the excesses that lead to the Higgs boson
  2. Interpret it in terms of Split Susy and determine the lifetime of the gluino
  3. For specific a dark matter scenario that relies on the Higgs boson,  map out what is next for the LHC.
The biggest chink in the armor of Split Susy is dark matter.  This can be shown below

There are 3 masses that matter for dark matter: M1, M2, mu.   How the dark matter behaves depends on the relative sizes of these 3 masses.    We're left with five regions illustrated above.  Two of these regions are essentially not discoverable: the Pure Wino and Pure Higgsino because the dark matter is too heavy.   Two of these regions are transition regions that are labeled "Well-Tempered".  These regions require an accident to have M1= mu or M2=M1.     Finally, there is the Higgs Resonance, which has light dark matter, but is mostly unexplored.  This dark matter scenario has the dark matter annihilate through the Higgs boson resonantly.  Normally this doesn't happen because the coupling of the Higgs to the dark matter is suppressed.  However, in Split Susy, violation of CP (having imaginary parameters) allows the dark matter Higgs coupling to be large.

We'll know shortly enough if this is true or not.  Next week, at the Lepton-Photon conference, there should be an update to the analyses that went into the Higgs anomalies.  If this turns out to be true, this will finish the Standard Model and we'll be left with trying to discover physics beyond the Standard Model.  If dark matter annihilates through the Higgs resonance, then the gluino of Split Susy should be visible in the very near future, possibly by the end of the year.

All in all, exciting times.

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