6,164 research outputs found
Lessons for SUSY from the LHC after the first run
A review of direct searches for new particles predicted by Supersymmetry
after the first run of the LHC is proposed. This review is based on the results
provided by the ATLAS and CMS experiments.Comment: 31 pages, 41 figures, Appear in the special issue of the EPJ C
journal entitled "SUSY after the Higgs discovery
Non-Simplified SUSY: Stau-Coannihilation at LHC and ILC
If new phenomena beyond the Standard Model will be discovered at the LHC, the
properties of the new particles could be determined with data from the
High-Luminosity LHC and from a future linear collider like the ILC. We discuss
the possible interplay between measurements at the two accelerators in a
concrete example, namely a full SUSY model which features a small stau_1-LSP
mass difference. Various channels have been studied using the Snowmass 2013
combined LHC detector implementation in the Delphes simulation package, as well
as simulations of the ILD detector concept from the Technical Design Report. We
investigate both the LHC and ILC capabilities for discovery, separation and
identification of various parts of the spectrum. While some parts would be
discovered at the LHC, there is substantial room for further discoveries at the
ILC. We finally highlight examples where the precise knowledge about the lower
part of the mass spectrum which could be acquired at the ILC would enable a
more in-depth analysis of the LHC data with respect to the heavier states.Comment: 42 pages, 18 figures, 12 table
The Many Faces of a Character
We prove an identity between three infinite families of polynomials which are
defined in terms of `bosonic', `fermionic', and `one-dimensional configuration'
sums. In the limit where the polynomials become infinite series, they give
different-looking expressions for the characters of the two integrable
representations of the affine algebra at level one. We conjecture yet
another fermionic sum representation for the polynomials which is constructed
directly from the Bethe-Ansatz solution of the Heisenberg spin chain.Comment: 14/9 pages in harvmac, Tel-Aviv preprint TAUP 2125-9
Economic inequalities in burden of illness, diagnosis and treatment of five long-term conditions in England: panel study
We compared the distribution by wealth of self-reported illness burden (estimated from validated scales, biomarker and reported symptoms) for angina, cataract, depression, diabetes and osteoarthritis, with the distribution of self-reported medical diagnosis and treatment. We aimed to determine if the greater illness burden borne by poorer participants was matched by appropriately higher levels of diagnosis and treatment
Thiel soft embalmed Porcine Kidney Perfusion Model for focused ultrasound therapy
Thiel soft embalmed porcine kidneys have been used to study the effect of artificial blood flow on focused ultrasound (FUS) therapy. A significant temperature drop is observed when a perfusion is established within the porcine kidneys, compared with the no-flow condition FUS leads to a 2 ~ 4 °C higher temperature rising. The influence of Thiel soft embalmed Porcine Kidney Perfusion Model for Focused Ultrasound Therapy e effect from blood flow must be considered
Heavy Scalar Top Quark Decays in the Complex MSSM: A Full One-Loop Analysis
We evaluate all two-body decay modes of the heavy scalar top quark in the
Minimal Supersymmetric Standard Model with complex parameters (cMSSM) and no
generation mixing. The evaluation is based on a full one-loop calculation of
all decay channels, also including hard QED and QCD radiation. The
renormalization of the complex parameters is described in detail. The
dependence of the heavy scalar top quark decay on the relevant cMSSM parameters
is analyzed numerically, including also the decay to Higgs bosons and another
scalar quark or to a top quark and the lightest neutralino. We find sizable
contributions to many partial decay widths and branching ratios. They are
roughly of O(10%) of the tree-level results, but can go up to 30% or higher.
These contributions are important for the correct interpretation of scalar top
quark decays at the LHC and, if kinematically allowed, at the ILC. The
evaluation of the branching ratios of the heavy scalar top quark will be
implemented into the Fortran code FeynHiggs.Comment: 86 pages, 38 figures; minor changes, version published as Phys. Rev.
D86 (2012) 03501
Self-consistent analytical solution of a problem of charge-carrier injection at a conductor/insulator interface
We present a closed description of the charge carrier injection process from
a conductor into an insulator. Common injection models are based on single
electron descriptions, being problematic especially once the amount of
charge-carriers injected is large. Accordingly, we developed a model, which
incorporates space charge effects in the description of the injection process.
The challenge of this task is the problem of self-consistency. The amount of
charge-carriers injected per unit time strongly depends on the energy barrier
emerging at the contact, while at the same time the electrostatic potential
generated by the injected charge- carriers modifies the height of this
injection barrier itself. In our model, self-consistency is obtained by
assuming continuity of the electric displacement and the electrochemical
potential all over the conductor/insulator system. The conductor and the
insulator are properly taken into account by means of their respective density
of state distributions. The electric field distributions are obtained in a
closed analytical form and the resulting current-voltage characteristics show
that the theory embraces injection-limited as well as bulk-limited
charge-carrier transport. Analytical approximations of these limits are given,
revealing physical mechanisms responsible for the particular current-voltage
behavior. In addition, the model exhibits the crossover between the two
limiting cases and determines the validity of respective approximations. The
consequences resulting from our exactly solvable model are discussed on the
basis of a simplified indium tin oxide/organic semiconductor system.Comment: 23 pages, 6 figures, accepted to Phys.Rev.
Charge carrier injection into insulating media: single-particle versus mean-field approach
Self-consistent, mean-field description of charge injection into a dielectric
medium is modified to account for discreteness of charge carriers. The improved
scheme includes both the Schottky barrier lowering due to the individual image
charge and the barrier change due to the field penetration into the injecting
electrode that ensures validity of the model at both high and low injection
rates including the barrier dominated and the space-charge dominated regimes.
Comparison of the theory with experiment on an unipolar ITO/PPV/Au-device is
presented.Comment: 32 pages, 9 figures; revised version accepted to PR
MC generators in CHORUS
This note presents an overview of general-purpose and specific Monte-Carlo
event generators used in the simulation of the CERN - CHORUS experiment, aiming
to search for oscillations and charm particle decays
in an emulsion target.Comment: 6 pages, LaTeX two-column format, 2 encapsulated postscript figures
Proceedings of NuInt01 Workshop (KEK, Tsukuba, Japan, 13-16.12.2001
Singular Value Decomposition of Operators on Reproducing Kernel Hilbert Spaces
Reproducing kernel Hilbert spaces (RKHSs) play an important role in many
statistics and machine learning applications ranging from support vector
machines to Gaussian processes and kernel embeddings of distributions.
Operators acting on such spaces are, for instance, required to embed
conditional probability distributions in order to implement the kernel Bayes
rule and build sequential data models. It was recently shown that transfer
operators such as the Perron-Frobenius or Koopman operator can also be
approximated in a similar fashion using covariance and cross-covariance
operators and that eigenfunctions of these operators can be obtained by solving
associated matrix eigenvalue problems. The goal of this paper is to provide a
solid functional analytic foundation for the eigenvalue decomposition of RKHS
operators and to extend the approach to the singular value decomposition. The
results are illustrated with simple guiding examples
- …