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The dark side of the $mu$: on multiple solutions to renormalisation group equations, and why the CMSSM is not necessarily being ruled out | | B.C. Allanach
; Damien P. George
; Ben Gripaios
; | | Date: |
19 Apr 2013 | | Abstract: | When solving renormalisation group equations in a quantum field theory, one
often specifies the boundary conditions at multiple renormalisation scales,
such as the weak and grand-unified scales in a theory beyond the standard
model. A point in the parameter space of such a model is usually specified by
the values of couplings at these boundaries of the renormalisation group flow,
but there is no theorem guaranteeing that such a point has a unique solution to
the associated differential equations, and so there may exist multiple,
phenomenologically distinct solutions, all corresponding to the same point in
parameter space. We show that this is indeed the case in the constrained
minimal supersymmetric standard model (CMSSM), and we exhibit such solutions,
which cannot be obtained using out-of-the-box computer programs in the public
domain. Some of the multiple solutions we exhibit have CP-even lightest Higgs
mass predictions between 124 and 126 GeV. Without an exhaustive 8-dimensional
MSSM parameter scan per CMSSM parameter point to capture all of the multiple
solutions, CMSSM phenomenological analyses are incomplete. | | Source: | arXiv, 1304.5462 | | Services: | Forum | Review | PDF | Favorites | |
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