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SUMMARY:Hitting a Natural Higgs in SUSY - Chris Wymant (Durham)
DTSTART:20121011T150000Z
DTEND:20121011T160000Z
UID:TALK39417@talks.cam.ac.uk
CONTACT:Helen Vryonidou
DESCRIPTION:Supersymmetric theories solve the hierarchy problem chiefly by
  virtue\nof a partner for the top quark\, the stop\, which contributes to 
 the Higgs mass\ncorrection an equal amount with the opposite sign. The nec
 essary soft breaking\nof supersymmetry makes the cancellation incomplete\,
  with unnaturalness\nreturning as the stop is decoupled. This leads us to 
 consider stops as light as\npossible\, subject to the extra constraint of 
 the now observed Higgs mass of\n~126 GeV. However we will show how 'maxima
 l mixing' of the stops\, while\nminimising their masses\, contributes a ne
 w source of fine-tuning that is in\nfact dominant. Lagrange constrained ma
 ximisation of analytic expressions for\nthe Higgs-stop interactions explic
 itly shows the optimal scenario to be\nnear-maximal mixing. We explain why
  the splitting between the two stop mass\neigenstates is entirely unconstr
 ained. We introduce the NMSSM and\nexplain its potential utility and limit
 ations for boosting the Higgs mass\nnaturally.
LOCATION:MR15\, CMS\, Wilberforce Road\, Cambridge\, CB3 0WB
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