3,865 research outputs found
Measuring the mass of the W at the LHC
We explore the ability of the Large Hadron Collider to measure the mass of the W boson. We believe that a precision better than ~ 15 MeV could be attained, based on a year of operation at low luminosity (10^(33)cm^(-2)s^(-1)). If this is true, this measurement will be the world's best determination of the W mass. We feel this interesting opportunity warrants investigation in more detail
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Multijet production at D{O}
We describe studies of jet production in {bar p}p collisions at {radical}s = 1.8 TeV. We have investigated topological distributions in inclusive three and four-jet events and find them to be well- described by tree-level QCD matrix elements and also by the HERWIG Monte Carlo. We have measured the ratio of inclusive three-jet to two- jet cross sections as a function of summed jet transverse energy. This is found to be in good qualitative agreement with QCD; the data show some preference for a softer renormalization scale for emission of the third jet
Prospects for Higgs at the Tevatron
The current status of simulation studies for the observation of a standard-model or lightest supersymmetric Higgs boson at TeV33 are reviewed. Latest studies indicate that the mass range 60 < m{sub H} {approx_lt} 130 GeV can be covered at the 5-standard-deviation level with 30 fb{sup -1}, using the WH and ZH channels. This is the full allowed mass range for the lightest Higgs h of minimal supersymmetry
Application of the penalty coupling method for the analysis of blood vessels
Due to the significant health and economic impact of blood vessel diseases on modern society, its analysis is becoming of increasing importance for the medical sciences. The complexity of the vascular system, its dynamics and material characteristics all make it an ideal candidate for analysis through fluid structure interaction (FSI) simulations. FSI is a relatively new approach in numerical analysis and enables the multi-physical analysis of problems, yielding a higher accuracy of results than could be possible when using a single physics code to analyse the same category of problems. This paper introduces the concepts behind the Arbitrary Lagrangian Eulerian (ALE) formulation using the penalty coupling method. It moves on to present a validation case and compares it to available simulation results from the literature using a different FSI method. Results were found to correspond well to the comparison case as well as basic theory
Two-way FSI modelling of blood flow through CCA accounting on-line medical diagnostics in hypertension
Flow parameters can induce pathological changes in the arteries. We propose a
method to asses those parameters using a 3D computer model of the flow in the Common
Carotid Artery. Input data was acquired using an automatic 2D ultrasound wall tracking
system. This data has been used to generate a 3D geometry of the artery. The diameter and wall
thickness have been assessed individually for every patient, but the artery has been taken as a
75mm straight tube. The Youngâs modulus for the arterial walls was calculated using the pulse
pressure, diastolic (minimal) diameter and wall thickness (IMT). Blood flow was derived from
the pressure waveform using a 2-parameter Windkessel model. The blood is assumed to be
non-Newtonian. The computational models were generated and calculated using commercial
code. The coupling method required the use of Arbitrary Lagrangian-Euler formulation to
solve Navier-Stokes and Navier-LamĂš equations in a moving domain. The calculations showed
that the distention of the walls in the model is not significantly different from the
measurements. Results from the model have been used to locate additional risk factors, such as
wall shear stress or circumferential stress, that may predict adverse hypertension
complications
Summary of the Very Large Hadron Collider Physics and Detector Workshop
One of the options for an accelerator beyond the LHC is a hadron collider
with higher energy. Work is going on to explore accelerator technologies that
would make such a machine feasible. This workshop concentrated on the physics
and detector issues associated with a hadron collider with an energy in the
center of mass of the order of 100 to 200 TeV
Narrow Technihadron Production at the First Muon Collider
In modern technicolor models, there exist very narrow spin-zero and spin-one
neutral technihadrons---, and ---with masses of a
few 100 GeV. The large coupling of to , the direct
coupling of and to the photon and , and the superb
energy resolution of the First Muon Collider may make it possible to resolve
these technihadrons and produce them at extraordinarily large rates.Comment: 11 pages, latex, including 2 postscript figure
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