64 research outputs found
Probing the No-Scale - One-Parameter Model via Gluino Searches at the LHC2
In our recent paper entitled "The return of the King: No-Scale -", we showed that the model space supporting the most favorable
phenomenology should have been probed in 2016 at the LHC2, with an even further
reach into this region of the model in 2017-18. This ideal realm of the
one-parameter version of No-Scale - yields a 1.9-2.3 TeV
gluino mass at the very same point where the light Higgs boson mass enters its
rather narrow experimentally determined range of GeV.
Given the recent results reported at Moriond 2017 for 36 of
luminosity collected in 2016 at the 13 TeV LHC2, we now update the status of
the No-Scale - model space in light of the gluino mass
exclusion limits presented by the ATLAS and CMS Collaborations. We illustrate
that a resolution could be reached soon as to whether supersymmetry lives in
this most critical region of the model space.Comment: 4 pages, 2 figures, Physics Letters B versio
The Search for a Realistic String Model at LHC
We survey the low-energy supersymmetry phenomenology of a three-family
Pati-Salam model constructed from intersecting D6-branes in Type IIA string
theory on the T^6/(Z_2 x Z_2) orientifold which possesses many of the
phenomenological properties desired in string model-building. In the model,
there is no exotic matter in the low-energy spectrum, the correct mass
hierarchies for quarks and leptons may be obtained, and the gauge couplings are
automatically unified at the string scale. We calculate the supersymmetry
breaking soft terms and the corresponding low-energy supersymmetry particle
spectra for the model. We find the WMAP constrained dark matter density can be
generated in this model in the stau-neutralino and chargino-neutralino
coannihilation regions, with expected final states at LHC consisting of low
energy leptons and O(GeV) neutrinos. Moreover, we expect final states in the
supercritical string cosmology (SSC) scenario to comprise high energy leptons
and O(GeV) neutrinos.Comment: 35 pages, 4 figures, accepted for publication in PR
Non-trivial Supersymmetry Correlations between ATLAS and CMS Observations
We present definite correlations between the CMS 5 \fb all-hadronic search
employing the stransverse mass variable and the ATLAS 5 \fb
all-hadronic and multijet supersymmetry (SUSY) searches, suggesting the
possibility that both the ATLAS and CMS experiments are already registering a
faint but legitimate SUSY signal at the LHC. We isolate this prospective mutual
productivity beyond the Standard Model in the framework of the supersymmetric
No-Scale Flipped (5) grand unified theory, supplemented with extra
vector-like matter (flippons). Evident overproduction is observed in three CMS
\mt2 and four ATLAS hadronic and multijet signal regions, where a \x2 fitting
procedure of the CMS 5 \fb \mt2 search establishes a best fit SUSY mass in
sharp agreement with corresponding ATLAS searches of equivalently heightened
signal significance. We believe this correlated behavior across two distinct
experiments at precisely the same SUSY mass scale to be highly non-trivial, and
potentially indicative of an existing 5 \fb LHC reach into a pervasive physical
supersymmetry framework.Comment: 6 Pages, 2 Figure
A 125.5 GeV Higgs Boson in F-SU(5): Imminently Observable Proton Decay, A 130 GeV Gamma-ray Line, and SUSY Multijets & Light Stops at the LHC8
We establish that the light Higgs boson mass in the context of the No-Scale
Flipped SU(5) GUT with TeV scale vector-like matter multiplets (flippons) is
consistent with m_h = 125.5+-0.5 GeV in the region of the best supersymmetry
(SUSY) spectrum fit to low statistics data excesses observed by ATLAS in
multijet and light stop 5/fb SUSY searches at the LHC7. Simultaneous
satisfaction of these disparate goals is achieved by employing a minor decrease
in the SU(5) partial unification scale M_{32} to lower the flippon mass,
inducing a larger Higgs boson mass shift from the flippon loops. The reduction
in M_{32}, which is facilitated by a phenomenologically favorable reduction of
the low-energy strong coupling constant, moreover suggests an imminently
observable (e|mu)^+ pi^0 proton decay with a central value time scale of
1.7x10^34 years. At the same point in the model space, we find a lightest
neutralino mass of m_{\chi} = 145 GeV, which is suitable for the production of
130 GeV monochromatic gamma-rays through annihilations yielding associated
Z-bosons; a signal with this energy signature has been identified within
observations of the galactic center by the FERMI-LAT Space Telescope. In
conjunction with direct correlations to the fate of the ATLAS multijet and
light stop production channels presently being tested at the LHC8, we suggest
that the reality of a 125.5 GeV Higgs boson affords a particularly rich company
of specific and imminently testable associated observables.Comment: European Physical Journal C Version; 10 Pages, 2 Figures, 2 Table
Profumo di SUSY: Suggestive Correlations in the ATLAS and CMS High Jet Multiplicity Data
We present persistently amassing evidence that the CMS and ATLAS
Collaborations may indeed be already registering supersymmetry events at the
Large Hadron Collider (LHC). Our analysis is performed in the context of a
highly phenomenologically favorable model named No-Scale F-SU(5), which
represents the unification of the F-lipped SU(5) Grand Unified Theory (GUT),
two pairs of hypothetical TeV-scale vector-like supersymmetric multiplets
derived out of F-Theory, and the dynamically established boundary conditions of
No-Scale supergravity. We document highly suggestive correlations between the
first inverse femtobarn of observations by CMS and ATLAS, where seductive
excesses in multijet events, particularly those with nine or more jets, are
unambiguously accounted for by a precision Monte-Carlo simulation of the
F-SU(5) model space. This intimate correspondence is optimized by a unified
gaugino mass in the neighborhood of M_{1/2}=518 GeV. We supplement this
analysis by extrapolating for the expected data profile to be realized with
five inverse femtobarns of integrated luminosity, as expected to be observed at
the LHC by the conclusion of 2011. Significantly, we find that this luminosity
may be sufficient to constitute a SUSY discovery for the favored benchmark
spectrum. Indeed, the winds wafting our way from Geneva may already be heavy
with the delicate perfume of Supersymmetry.Comment: 15 pages, 5 figures, 6 table
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