33,210 research outputs found
The Need to Support of Data Flow Graph Visualization of Forensic Lucid Programs, Forensic Evidence, and their Evaluation by GIPSY
Lucid programs are data-flow programs and can be visually represented as data
flow graphs (DFGs) and composed visually. Forensic Lucid, a Lucid dialect, is a
language to specify and reason about cyberforensic cases. It includes the
encoding of the evidence (representing the context of evaluation) and the crime
scene modeling in order to validate claims against the model and perform event
reconstruction, potentially within large swaths of digital evidence. To aid
investigators to model the scene and evaluate it, instead of typing a Forensic
Lucid program, we propose to expand the design and implementation of the Lucid
DFG programming onto Forensic Lucid case modeling and specification to enhance
the usability of the language and the system and its behavior. We briefly
discuss the related work on visual programming an DFG modeling in an attempt to
define and select one approach or a composition of approaches for Forensic
Lucid based on various criteria such as previous implementation, wide use,
formal backing in terms of semantics and translation. In the end, we solicit
the readers' constructive, opinions, feedback, comments, and recommendations
within the context of this short discussion.Comment: 11 pages, 7 figures, index; extended abstract presented at VizSec'10
at http://www.vizsec2010.org/posters ; short paper accepted at PST'1
A facility to Search for Hidden Particles (SHiP) at the CERN SPS
A new general purpose fixed target facility is proposed at the CERN SPS
accelerator which is aimed at exploring the domain of hidden particles and make
measurements with tau neutrinos. Hidden particles are predicted by a large
number of models beyond the Standard Model. The high intensity of the SPS
400~GeV beam allows probing a wide variety of models containing light
long-lived exotic particles with masses below (10)~GeV/c,
including very weakly interacting low-energy SUSY states. The experimental
programme of the proposed facility is capable of being extended in the future,
e.g. to include direct searches for Dark Matter and Lepton Flavour Violation.Comment: Technical Proposa
Jets from Massive Unstable Particles: Top-Mass Determination
We construct jet observables for energetic top quarks that can be used to
determine a short distance top quark mass from reconstruction in e+ e-
collisions with accuracy better than Lambda_{QCD}. Using a sequence of
effective field theories we connect the production energy, mass, and top width
scales, Q>> m>> Gamma, for the top jet cross section, and derive a QCD
factorization theorem for the top invariant mass spectrum. Our analysis
accounts for: alpha_s corrections from the production and mass scales,
corrections due to constraints in defining invariant masses, non-perturbative
corrections from the cross-talk between the jets, and alpha_s corrections to
the Breit-Wigner line-shape. This paper mainly focuses on deriving the
factorization theorem for hemisphere invariant mass distributions and other
event shapes in e+e- collisions applicable at a future Linear Collider. We show
that the invariant mass distribution is not a simple Breit-Wigner involving the
top width. Even at leading order it is shifted and broadened by
non-perturbative soft QCD effects. We predict that the invariant mass peak
position increases linearly with Q/m due to these non-perturbative effects.
They are encoded in terms of a universal soft function that also describes soft
effects for massless dijet events. In a future paper we compute alpha_s
corrections to the jet invariant mass spectrum, including a summation of large
logarithms between the scales Q, m and Gamma.Comment: 54 pages, 10 figures, typos corrected, figures update
Tau spin correlations and the anomalous magnetic moment
We show that the precise determination of the Tau magnetic properties is
possible in the next generation accelerators, specially at B/Flavour factories.
We define spin correlation observables suitable to extract the real part of the
magnetic form factor that, for the first time, will allow to test the standard
model-QED predictions. In particular, the predicted QED-dependence with both
the momentum transfer and the lepton mass can be precisely measured. Until now,
the most stringent bounds on the magnetic moment come from LEP
data with strong assumptions on the physics involved on the observed process.
In this paper, we find three different combinations of spin correlations of the
outgoing Taus that disentangle the magnetic moment form factor of the Tau
lepton in the electromagnetic vertex. These combinations of asymmetries also
get rid off the contributions coming from Z-mediating amplitudes to the defined
correlations. Using unpolarized electron beams and an integrated luminosity of
, the sensitivity to the magnetic moment form
factor is of the order . This sensitivity is two orders of magnitude
better than the present existing high- or low-energy bounds on the magnetic
moment and would allow its actual measurement with the precision of a few per
cent.Comment: 14 pages, 1 figur
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