Showing papers by "Graham G. Ross published in 2011"
TL;DR: In this paper, the authors studied supersymmetric extensions of the Standard Model, including the MSSM, and supersymmymmetric orbifold GUTs in 4 and higher dimensions.
203 citations
TL;DR: In this paper, the authors consider the possible anomaly free Abelian discrete symmetries of the MSSM that forbid the μ-term at perturbative order and prove that there is a unique Z 4 R symmetry that commutes with SO (10 ).
140 citations
TL;DR: In this paper, the authors show that the low-fine-tuned regions fall into two classes that will require complementary collider and dark matter searches to explore in the near future, and identify the multijet plus ETmiss signal as the optimal channel and determine the discovery potential.
Abstract: The requirement that SUSY should solve the hierarchy problem without undue fine-tuning imposes severe constraints on the new supersymmetric states. With the MSSM spectrum and soft SUSY breaking originating from universal scalar and gaugino masses at the Grand Unification scale, we show that the low-fine-tuned regions fall into two classes that will require complementary collider and dark matter searches to explore in the near future. The first class has relatively light gluinos or squarks which should be found by the LHC in its first run. We identify the multijet plus ETmiss signal as the optimal channel and determine the discovery potential in the first run. The second class has heavier gluinos and squarks but the LSP has a significant Higgsino component and should be seen by the next generation of direct dark matter detection experiments. The combined information from the 7 TeV LHC run and the next generation of direct detection experiments can test almost all of the CMSSM parameter space consistent with dark matter and EW constraints, corresponding to a fine-tuning not worse than 1:100. To cover the complete low-fine-tuned region by SUSY searches at the LHC will require running at the full 14 TeV CM energy; in addition it may be tested indirectly by Higgs searches covering the mass range below 120 GeV.
48 citations
TL;DR: In this article, the authors identify the multijet plus E_T^miss signal as the optimal channel and determine the discovery potential in the first run and show that the low-fine-tuned regions fall into two classes that will require complementary collider and dark matter searches to explore.
Abstract: The requirement that SUSY should solve the hierarchy problem without undue fine-tuning imposes severe constraints on the new supersymmetric states. With the MSSM spectrum and soft SUSY breaking originating from universal scalar and gaugino masses at the Grand Unification scale, we show that the low-fine-tuned regions fall into two classes that will require complementary collider and dark matter searches to explore in the near future. The first class has relatively light gluinos or squarks which should be found by the LHC in its first run. We identify the multijet plus E_T^miss signal as the optimal channel and determine the discovery potential in the first run. The second class has heavier gluinos and squarks but the LSP has a significant Higgsino component and should be seen by the next generation of direct dark matter detection experiments. The combined information from the 7 TeV LHC run and the next generation of direct detection experiments can test almost all of the CMSSM parameter space consistent with dark matter and EW constraints, corresponding to a fine-tuning not worse than 1:100. To cover the complete low-fine-tuned region by SUSY searches at the LHC will require running at the full 14 TeV CM energy; in addition it may be tested indirectly by Higgs searches covering the mass range below 120 GeV.
16 citations
TL;DR: In this paper, it was shown that for the lowest temperatures, the experimental determination of the position of the quantum critical points agrees to the parts per mille level with the prediction from Γ 0 (2 ).
10 citations
Posted Content•
05 Aug 2011
TL;DR: In this paper, the degree of fine-tuning needed in a generalised version of the NMSSM that follows from an underlying Z4 or Z8 R-symmetry was determined.
Abstract: We determine the degree of fine-tuning needed in a generalised version of the NMSSM that follows from an underlying Z4 or Z8 R-symmetry We find that it is significantly less than is found in the MSSM or NMSSM and extends the range of Higgs mass that have acceptable fine-tuning Remarkably the minimal fine-tuning is achieved for Higgs masses of around 130 GeV
9 citations