TY  - JOUR
A1  - Bechtle, Philip
A1  - Camargo-Molina, José Eliel
A1  - Desch, Klaus
A1  - Dreiner, Herbert K.
A1  - Hamer, Matthias
A1  - Krämer, Michael
A1  - O'Leary, Ben
A1  - Porod, Werner
A1  - Sarrazin, Björn
A1  - Stefaniak, Tim
A1  - Uhlenbrock, Mathias
A1  - Wienemann, Peter
T1  - Killing the cMSSM softly
JF  - The European Physical Journal C
N2  - We investigate the constrained Minimal Supersymmetric Standard Model (cMSSM) in the light of constraining experimental and observational data from precision measurements, astrophysics, direct supersymmetry searches at the LHC and measurements of the properties of the Higgs boson, by means of a global fit using the program Fittino. As in previous studies, we find rather poor agreement of the best fit point with the global data. We also investigate the stability of the electro-weak vacuum in the preferred region of parameter space around the best fit point. We find that the vacuum is metastable, with a lifetime significantly longer than the age of the Universe. For the first time in a global fit of supersymmetry, we employ a consistent methodology to evaluate the goodness-of-fit of the cMSSM in a frequentist approach by deriving p values from large sets of toy experiments. We analyse analytically and quantitatively the impact of the choice of the observable set on the p value, and in particular its dilution when confronting the model with a large number of barely constraining measurements. Finally, for the preferred sets of observables, we obtain p values for the cMSSM below 10 %, i.e. we exclude the cMSSM as a model at the 90 % confidence level.
KW  - Dark Matter
KW  - Higgs Boson
KW  - Higgs Mass
KW  - Supersymmetry Breaking
KW  - Light Supersymmetric Particle
Y1  - 2016
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-165045
VL  - 76
IS  - 96
ER  - 
TY  - JOUR
A1  - Dreiner, Herbi K.
A1  - Krauss, Manuel E.
A1  - O'Leary, Ben
A1  - Opferkuch, Toby
A1  - Staub, Florian
T1  - Validity of the CMSSM interpretation of the diphoton excess
JF  - Physical Review D
N2  - It has been proposed that the observed diphoton excess at 750 GeV could be explained within the constrained minimal supersymmetric standard model via resonantly produced stop bound states. We reanalyze this scenario critically and extend previous work to include the constraints from the stability of the electroweak vacuum and from the decays of the stoponium into a pair of Higgs bosons. It is shown that the interesting regions of parameter space with a light stop and Higgs of the desired mass are ruled out by these constraints. This conclusion is not affected by the presence of the bound states because the binding energy is usually very small in the regions of parameter space which can explain the Higgs mass. Thus, this also leads to strong constraints on the diphoton production cross section which is in general too small.
KW  - Minimal supersymmetric model
KW  - 2-loop level
KW  - Bound-states
KW  - Higgs-boson
KW  - MSSM
KW  - Mass
KW  - Spheno
KW  - Sarah
KW  - Spectrum
KW  - Breaking
Y1  - 2016
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-187429
VL  - 94
IS  - 5
ER  -