23 research outputs found
Constraints on Higgs Properties and SUSY Partners in the pMSSM
Direct searches for superpartners and precision measurements of the
properties of the GeV Higgs boson lead to important inter-dependent
constraints on the underlying parameter space of the MSSM. The 19/20-parameter
p(henomenological)MSSM offers a flexible framework for the study of a wide
variety of both Higgs and SUSY phenomena at the LHC and elsewhere. Within this
scenario we address the following questions: `What will potentially null
searches for SUSY at the LHC tell us about the possible properties of the Higgs
boson?' and, conversely, `What do precision measurements of the properties of
the Higgs tell us about the possible properties of the various superpartners?'
Clearly the answers to such questions will be functions of both the collision
energy of the LHC as well as the accumulated integrated luminosity. We address
these questions employing several sets of pMSSM models having either neutralino
or gravitino LSPs, making use of the ATLAS SUSY analyses at the 7/8 TeV LHC as
well as planned SUSY and Higgs analyses at the 14 TeV LHC and the ILC. Except
for theoretical uncertainties that remain to be accounted for in the ratios of
SUSY and SM couplings, we demonstrate that Higgs coupling measurements at the
14 TeV LHC, and particularly at the 500 GeV ILC, will be sensitive to regions
of the pMSSM model space that are not accessible to direct SUSY searches.Comment: 23 pages, 9 figures. Contributed to the Community Summer Study 2013,
Minneapolis, MN July 29 - August 6, 201
More Energy, More Searches, but the pMSSM Lives On
We further examine the capability of the 7 and 8 TeV LHC to explore the
parameter space of the p(henomenological)MSSM with neutralino LSPs. Here we
present an updated study employing all of the relevant ATLAS SUSY analyses, as
well as all relevant LHC non-MET searches, whose data were publically available
as of mid-September 2012. We find that roughly 1/3 of our pMSSM model points
are excluded at present with an important role being played by both the heavy
flavor and multi-lepton searches, as well as those for heavy stable charged
particles. Nonetheless, we find that light gluinos, 1st/2nd generation squarks,
and stop/sbottoms (\lsim 400-700 GeV), as well as models with 1% fine-tuning or
better, are still viable in the pMSSM. In addition, we see that increased
luminosity at 8 TeV is unlikely to significantly improve the reach of the
"vanilla" searches. The impact of these null searches on the SUSY sparticle
spectrum is discussed in detail and the implications of these results for
models with low fine-tuning, a future lepton collider and dark matter searches
are examined.Comment: 33 pages, 9 figure
pMSSM Benchmark Models for Snowmass 2013
We present several benchmark points in the phenomenological Minimal
Supersymmetric Standard Model (pMSSM). We select these models as experimentally
well-motivated examples of the MSSM which predict the observed Higgs mass and
dark matter relic density while evading the current LHC searches. We also use
benchmarks to generate spokes in parameter space by scaling the mass parameters
in a manner which keeps the Higgs mass and relic density approximately
constant.Comment: 10 pages, 6 figure
The CP-violating pMSSM at the Intensity Frontier
In this Snowmass whitepaper, we describe the impact of ongoing and proposed
intensity frontier experiments on the parameter space of the Minimally
Supersymmetric Standard Model (MSSM). We extend a set of phenomenological MSSM
(pMSSM) models to include non-zero CP-violating phases and study the
sensitivity of various flavor observables in these scenarios Future electric
dipole moment and rare meson decay experiments can have a strong impact on the
viability of these models that is relatively independent of the detailed
superpartner spectrum. In particular, we find that these experiments have the
potential to probe models that are expected to escape searches at the
high-luminosity LHC.Comment: 10 pages, 2 figures. Contributed to the Community Summer Study 2013,
Minneapolis, MN July 29 - August 6, 201
SLAC-PUB-15458 pMSSM Benchmark Models for Snowmass 2013 ∗
We present several benchmark points in the phenomenological Minimal Supersymmetric Standard Model (pMSSM). We select these models as experimentally wellmotivated examples of the MSSM which predict the observed Higgs mass and dark matter relic density while evading the current LHC searches. We also use benchmarks to generate spokes in parameter space by scaling the mass parameters in a manner which keeps the Higgs mass and relic density approximately constant. 1 pMSSM Model Generation Despite the continued null results from the LHC, supersymmetry in general and the MSSM in particular remain well-motivated and therefore of considerable interest to future experimental programs. We therefore introduce several benchmark points within the MSSM which predict the observed Higgs mass and dark matter relic density, yet are allowed by current experimental data. These points were taken from scans of the phenomenological MSSM (pMSSM), a subspace of the MSSM with parameters defined at the electroweak scale [1]. The pMSSM is defined by applying the following experimentally-motivated constraints to the R-parity conserving MSSM: (i) CP conservation, (ii) Minimal Flavor Violation at the electroweak scale, (iii) degenerate first and second generation sfermion masses, (iv) negligible Yukawa couplings and A-terms for the first two generations. In particular, no assumptions are made about physics at high scales, e.g. unification or SUSY breaking, in order to capture electroweak scale phenomenology for which a UV-complete theory may not yet exist. Imposing the constraints (i)-(v) decreases the number of free parameters from 105 to 19, o