95 research outputs found
The -parity Violating Decays of Charginos and Neutralinos in the B-L MSSM
The MSSM is the MSSM with three right-handed neutrino chiral multiplets
and gauged symmetry. The symmetry is broken by the third family
right-handed sneutrino acquiring a VEV, thus spontaneously breaking -parity.
Within a natural range of soft supersymmetry breaking parameters, it is shown
that a large and uncorrelated number of initial values satisfy all present
phenomenological constraints; including the correct masses for the ,
bosons, having all sparticles exceeding their present lower bounds and
giving the experimentally measured value for the Higgs boson. For this "valid"
set of initial values, there are a number of different LSPs, each occurring a
calculable number of times. We plot this statistically and determine that among
the most prevalent LSPs are chargino and neutralino mass eigenstates. In this
paper, the -parity violating decay channels of charginos and neutralinos to
standard model particles are determined, and the interaction vertices and decay
rates computed analytically. These results are valid for any chargino and
neutralino, regardless of whether or not they are the LSP. For chargino and
neutralino LSPs, we will-- in a subsequent series of papers --present a
numerical study of their RPV decays evaluated statistically over the range of
associated valid initial points.Comment: 62 pages, 12 figures, added references in section 1, corrected some
calculation error
Turbulent spectra in real-time gauge field evolution
We investigate ultraviolet fixed points in the real-time evolution of
non-Abelian gauge fields. Classical-statistical lattice simulations reveal
equal-time correlation functions with a spectral index 3/2. Analytical
understanding of this result is achieved by employing a 2PI- loop expansion for
the quantum theory.Comment: 4 pages, 2 figures. Talk presented at SEWM 2008, August 26-29,
Amsterda
Explicit Soft Supersymmetry Breaking in the Heterotic M-Theory MSSM
The strongly coupled heterotic M-theory vacuum for both the observable and
hidden sectors of the MSSM theory is reviewed, including a discussion of
the "bundle" constraints that both the observable sector vector bundle
and the a hidden sector bundle induced from a line bundle must satisfy. Gaugino
condensation is then introduced within this context, and the hidden sector
bundles that exhibit gaugino condensation are presented. The condensation scale
is computed, singling out one line bundle whose associated condensation scale
is low enough to be compatible with the energy scales available at the LHC. The
corresponding region of K\"ahler moduli space where all bundle constraints are
satisfied is presented. The generic form of the moduli dependent -terms due
to a gaugino superpotential - which spontaneously break supersymmetry in
this sector - is presented and then given explicitly for the unique line bundle
associated with the low condensation scale. The moduli dependent coefficients
for each of the gaugino and scalar field soft supersymmetry breaking terms are
computed leading to a low-energy effective Lagrangian for the observable sector
matter fields. We then show that at a large number of points in K\"ahler moduli
space that satisfy all "bundle" constraints, these coefficients are initial
conditions for the renormalization group equations which, at low energy, lead
to completely realistic physics satisfying all phenomenological constraints.
Finally, we show that a substantial number of these initial points also satisfy
a final constraint arising from the quadratic Higgs-Higgs conjugate soft
supersymmetry breaking term.Comment: v2: typos corrected; 58 pages, 7 figure
Hidden Sectors from Multiple Line Bundles for the MSSM
We give a formalism for constructing hidden sector bundles as extensions of
sums of line bundles in heterotic -theory. Although this construction is
generic, we present it within the context of the specific Schoen threefold that
leads to the physically realistic MSSM model. We discuss the embedding of
the line bundles, the existence of the extension bundle, and a number of
necessary conditions for the resulting bundle to be slope-stable and thus
supersymmetric. An explicit example is presented, where two line bundles are
embedded into the factor of the maximal subgroup
of the hidden sector gauge group, and then enhanced to a non-Abelian
bundle by extension. For this example, there are in fact six
inequivalent extension branches, significantly generalizing that space of
solutions compared with hidden sectors constructed from a single line bundle.Comment: 51 pages, 5 figure
The Strongly Coupled E8xe8 Heterotic String: Geometry & Phenomenology
Working within the context of the strongly coupled E8 x E8 heterotic string theory, we analyze the B-L MSSM, a realistic supersymmetric extension of the Standard Model, from both a low-energy phenomenologyand high-energy string perspective. From a formal point of view, we examine different constructions of string vacua, which satisfy a series of theoretical and phenomenological constraints. Such vacua configurations are anomaly-free, preserve N = 1 SUSY at the compactification scale and yield the correct value for the SO(10) unification scale and gauge coupling in the visible particle sector. Furthermore, we analyze a possible SUSY-breaking mechanism for the type of vacua we construct, via gaugino condensation in the hidden sector. In an attempt to connect these findings to experiment, we study the prospects of detecting the B-L MSSM at the LHC in the near future. Within this specific context, we show that R-parity violating decays of supersymmetric particles could be amenable to direct detection at the ATLAS and CMS detectors. Detection of these processes would not only be an explicit indication of Beyond the Standard Model physics, but would also hint strongly at the existence of N=1 SUSY with spontaneously broken R-parity
Semantics-Preserving Implementation of Synchronous Specifications Over Dynamic TDMA Distributed Architectures
International audienceWe propose a technique to automatically synthesize programs and schedules for hard real-time distributed (embedded) systems from synchronous data-flow models. Our technique connects the SynDEx scheduling tool and the Network Code toolchain in a seamless flow of automatic model transformations that go all the way from specification to implementation. Our contribution is the non-trivial connection between the models manipulated by SynDEx and by the Network Code toolchain, at both formal and tool level. We provide an algorithm for converting the data-dependent schedule tables output by SynDEx into Network Code programs which can be seen as an ``assembly code'' level for time-driven distributed real-time systems. The main difficulty is to ensure the preservation of both functionality and the real-time guarantees computed by SynDEx in the presence of clock drifts (which are abstracted away in the scheduling model of SynDEx). Existing tools can convert the resulting Network Code programs into software and hardware-accelerated execution units.Nous proposons une technique pour la synthÚse automatique de programmes et ordonnancements pour des systÚmes temps-réel (embarqués) distribués, à partir de spécifications synchrones flot de données
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