2,351 research outputs found
Human performance control monitoring systems Interim report no. 2
Computer program to simulate second order servo system dynamics under automatic and manual contro
Hip Pain in a Male High School Runner
Please refer to the pdf version of the abstract located adjacent to the title
Deep Peroneal Neuropathy: Sequela of a Missed Acute Exertional Compartment Syndrome
Click the PDF icon to download the abstrac
The lightest Higgs mass in supersymmetric models with extra dimensions
In the four-dimensional supersymmetric standard model extended with gauge
singlets the lightest Higgs boson mass, , has an important contribution
proportional to the squared of the superpotential coupling of
singlets to Higgs fields, . The requirement of
perturbativity up to the unification scale yields an upper bound on GeV. In extensions to theories with (longitudinal) extra dimensions at the
TeV where such coupling exists and massive Kaluza-Klein states fall into N=2
representations, if either of the Higgs or singlet fields live in the bulk of
the extra dimensions, the -function of is suppressed due to
the absence of anomalous dimension of hypermultiplets to leading order. This
implies a slower running of and an enhancement of its low energy
value. The upper bound increases to values GeV.Comment: Latex2e, 11 pages, 1 figur
MONDO: A tracker for the characterization of secondary fast and ultrafast neutrons emitted in particle therapy
Higher dimensional supersymmetry in 4D superspace
We present an explicit formulation of supersymmetric Yang-Mills theories from
\D= 5 to 10 dimensions in the familiar \N=1,\D=4 superspace. This provides
the rules for globally supersymmetric model building with extra dimensions and
in particular allows us to simply write down SUSY preserving
interactions between bulk fields and fields localized on branes. We present a
few applications of the formalism by way of illustration, including
supersymmetric ``shining'' of bulk fields, orbifolds and localization of chiral
fermions, anomaly inflow and super-Chern-Simons theories.Comment: Typos corrected. Added reference to early work by Marcus, Sagnotti
and Siegel and a term to the non-Abelian Lagrangian for D>5 formally needed
for gauge invariance. The results however remain unchange
Characterisation of the secondary-neutron production in particle therapy treatments with the MONDO tracking detector
Particle Therapy (PT) is a non-invasive technique that exploits charged light ions for the irradiation of tumours that cannot be effectively treated with surgery or conventional radiotherapy. While the largest dose fraction is released to the tumour volume by the primary beam, a non-negligible amount of additional dose is due to the beam fragmentation that occurs along the path towards the target volume. In particular, the produced neutrons are particularly dangerous as they can release their energy far away from the treated area, increasing the risk of developing a radiogenic secondary malignant neoplasm after undergoing a treatment. A precise measurement of the neutron flux, energy spectrum and angular distributions is eagerly needed in order to improve the treatment planning system software, so as to predict the normal tissue toxicity in the target region and the risk of late complications in the whole body. The MONDO (MOnitor for Neutron Dose in hadrOntherapy) project is dedicated to the characterisation of the secondary ultra-fast neutrons ([20-400] MeV energy range) produced in PT. The neutron tracking system exploits the reconstruction of the recoil protons produced in two consecutive (n, p) elastic scattering interactions to measure simultaneously the neutron incoming direction and energy. The tracker active media is a matrix of thin squared scintillating fibers arranged in orthogonally oriented layers that are read out by a sensor (SBAM) based on SPAD (Single-Photon Avalanche Diode) detectors developed in collaboration with the Fondazione Bruno Kessler (FBK)
Spontaneous localization of bulk matter fields
We study models compactified on S^1/Z_2 with bulk and brane matter fields
charged under U(1) gauge symmetry. We calculate the FI-terms and show by
minimizing the resulting potential that supersymmetry or gauge symmetry is
spontaneously broken if the sum of the charges does not vanish. Even if this
sum vanishes, there could be an instability as a consequence of localized
FI-terms. This leads to a spontaneous localization of charged bulk fields on
respective branes.Comment: 11 pages, LaTeX, 1 figur
- …