553 research outputs found
The LHC (CMS) Discovery Potential for Models with Effective Supersymmetry and Nonuniversal Gaugino Masses
We investigate squark and gluino pair production at LHC (CMS) with subsequent
decays into quarks, leptons and LSP in models with effective supersymmetry
where third generation of squarks is relatively light while the first two
generations of squarks are heavy. We consider the general case of nonuniversal
gaugino masses. Visibility of signal by an excess over SM background in (n \geq
2)jets + (m \geq 0)leptons + E^{miss}_T events depends rather strongly on the
relation between LSP, second neutralino, gluino and squark masses and it
decreases with the increase of LSP mass. We find that for relatively heavy
gluino it is very difficult to detect SUSY signal even for light 3^{rd}
generation squarks (m_{\tilde q_3}\le 1 TeV) if the LSP mass is closed to the
3^{rd} generation squark mass.Comment: 1 latex (35 pages), 4 eps (figures) file
A life cycle stakeholder management framework for enhanced collaboration between stakeholders with competing interests
This is a postprint version of the Book Chapter. Information regarding the official publication is available from the link below - Copyright @ 2011 SpringerImplementation of a Life Cycle Sustainability Management (LCSM) strategy can involve significant challenges because of competing or conflicting objectives between stakeholders. These differences may, if not identified and managed, hinder successful adoption of sustainability initiatives. This article proposes a conceptual framework for stakeholder management in a LCSM context. The framework identifies the key sustainability stakeholder groups and suggests strategic ambiguity as a management tool to harness dysfunctional conflict into constructive collaboration. The framework is of practical value as it can be used as a guideline by managers who wish to improve collaboration with stakeholders along the supply chain. The article also fills a gap in the academic literature where there is only limited research on sustainability stakeholder management through strategic ambiguity
Single flux quantum circuits with damping based on dissipative transmission lines
We propose and demonstrate the functioning of a special Rapid Single Flux
Quantum (RSFQ) circuit with frequency-dependent damping. This damping is
achieved by shunting individual Josephson junctions by pieces of open-ended RC
transmission lines. Our circuit includes a toggle flip-flop cell, Josephson
transmission lines transferring single flux quantum pulses to and from this
cell, as well as DC/SFQ and SFQ/DC converters. Due to the desired
frequency-dispersion in the RC line shunts which ensures sufficiently low noise
at low frequencies, such circuits are well-suited for integrating with the
flux/phase Josephson qubit and enable its efficient control.Comment: 6 pages incl. 6 figure
The strong coupling, unification, and recent data
The prediction of the strong coupling assuming (supersymmetric) coupling
constant unification is reexamined. We find, using the new electroweak data,
. The implications of the large
value are discussed. The role played by the beauty width is
stressed. It is also emphasized that high-energy (but not low-energy)
corrections could significantly diminish the prediction. However, unless
higher-dimension operators are assumed to be suppressed, at present one cannot
place strong constraints on the super-heavy spectrum. Non-leading electroweak
threshold corrections are also discussed.Comment: 12 pages, LaTex + RevTex, uuencoded postscript file (including 13
figures) is attached. Also available at ftp://dept.physics.upenn.edu/pub/Ni
Two-Fluid RANS-RSTM-PDF Model for Turbulent Particulate Flows
A novel three-dimensional (3D) model based on Reynolds turbulence stress model (RSTM) closure of equations of carrier and particulate phases was elaborated for channel turbulent flows. The essence of the model is the direct calculation of normal and shear components of the Reynolds stresses for the particulate phase similar to the carrier fluid. The model is based on the Eulerian approach, which is applied for the 3D RANS modeling of the carrier flow and the particulate phase and the statistical probability dense function (PDF) approach focusing on the mathematical description of the second moments of the particulate phase
Fast Simulators for Satellite Cloud Optical Centroid Pressure Retrievals, 1. Evaluation of OMI Cloud Retrievals
The cloud Optical Centroid Pressure (OCP), also known as the effective cloud pressure, is a satellite-derived parameter that is commonly used in trace-gas retrievals to account for the effects of clouds on near-infrared through ultraviolet radiance measurements. Fast simulators are desirable to further expand the use of cloud OCP retrievals into the operational and climate communities for applications such as data assimilation and evaluation of cloud vertical structure in general circulation models. In this paper, we develop and validate fast simulators that provide estimates of the cloud OCP given a vertical profile of optical extinction. We use a pressure-weighting scheme where the weights depend upon optical parameters of clouds and/or aerosol. A cloud weighting function is easily extracted using this formulation. We then use fast simulators to compare two different satellite cloud OCP retrievals from the Ozone Monitoring Instrument (OMI) with estimates based on collocated cloud extinction profiles from a combination of CloudS at radar and MODIS visible radiance data. These comparisons are made over a wide range of conditions to provide a comprehensive validation of the OMI cloud OCP retrievals. We find generally good agreement between OMI cloud OCPs and those predicted by CloudSat. However, the OMI cloud OCPs from the two independent algorithms agree better with each other than either does with the estimates from CloudSat/MODIS. Differences between OMI cloud OCPs and those based on CloudSat/MODIS may result from undetected snow/ice at the surface, cloud 3-D effects, low altitude clouds missed by CloudSat, and the fact that CloudSat only observes a relatively small fraction of an OMI field-of-view
Low-scale supersymmetry breaking: effective description, electroweak breaking and phenomenology
We consider supersymmetric scenarios in which the scale of SUSY breaking is
low, sqrt{F}=O(TeV). Instead of studying specific models of this type, e.g.
those with extra dimensions and low fundamental scale, we follow a
model-independent approach based on a general effective Lagrangian, in which
the MSSM supermultiplets are effectively coupled to a singlet associated to
SUSY breaking. Our goal is to analyse the interplay bewteen SUSY breaking and
electroweak breaking, generalizing earlier results. The conventional MSSM
picture can be substantially modified, mainly because the Higgs potential
contains additional effective quartic terms and resembles that of
two-Higgs-doublet models, with an additional singlet. Novel opportunities to
achieve electroweak breaking arise, and the electroweak scale may be obtained
in a less fine-tuned way. Also the Higgs spectrum can be strikingly changed,
and the lightest state can be much heavier than in usual supersymmetric
scenarios. Other effects appear in the chargino and neutralino sectors, which
contain the goldstino. Finally, we discuss the role of electroweak breaking in
processes in which two goldstinos could be emitted, such as fermion-antifermion
annihilation and the invisible decay of a Z boson or of neutral Higgs bosons.Comment: LaTeX, 47 pages, 5 figures; typos corrected, to appear in Nucl. Phys.
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