2,769 research outputs found
Electroweak Results from LEP and SLC and Tests of the Standard Model
An update of the electroweak measurements at LEP and SLC is presented. These
measurements are used to perform precise tests of the Standard Model. A
constraint on the Standard Model Higgs mass is obtained when the direct
measurements of and are included in the fit. A combination with
the direct Higgs search is also shown.Comment: 8 page
The status of Virgo
National audienceIn this paper the main characteristics of the interferometric gravitational waves detector Virgo are presented as well as its present status and perspectives
GePEToS : A Geant4 Monte Carlo simulation package for Positron Emission Tomography
GePEToS is a simulation framework developed over the last few years for
assessing the instrumental performance of future PET scanners. It is based on
Geant4, written in Object-Oriented C++ and runs on Linux platforms. The
validity of GePEToS has been tested on the well-known Siemens ECAT EXACT HR+
camera. The results of two application examples are presented : the design
optimization of a liquid Xe micro-PET camera dedicated to small animal imaging
as well as the evaluation of the effect of a strong axial magnetic field on the
image resolution of a Concorde P4 micro-PET camera.Comment: 5 pages, 12 figures, submitted to IEEE Transactions on Nuclear
Scienc
Initial-Final-State Interference in the Z line-shape
The uncertainty in the determination of the Z line-shape parameters coming
from the precision of the calculation of the Initial-State Radiation and
Initial--Final-State Interference is 2 10**(-4) for the total cross section
sigma zero(had) at the Z peak, 0.15 MeV for the Z mass M Z, and 0.1 MeV for the
Z width Gamma Z. Corrections to Initial--Final-State Interference beyond
\Order{\alpha^1} are discussed.Comment: 10 pages LaTeX including 2 PostScript figure
Experimental study of a liquid Xenon PET prototype module
A detector using liquid Xenon in the scintillation mode is studied for
Positron Emission Tomography (PET). The specific design aims at taking full
advantage of the liquid Xenon properties. It does feature a promising
insensitive to any parallax effect. This work reports on the performances of
the first LXe prototype module, equipped with a position sensitive PMT
operating in the VUV range (178 nm).Comment: Proc. of the 7th International Workshops on Radiation Imaging
Detectors (IWORID-7), Grenoble, France 4-7 July 200
Two-Loop Results for M_W in the Standard Model and the MSSM
Recent higher-order results for the prediction of the W-boson mass, M_W,
within the Standard Model are reviewed and an estimate of the remaining
theoretical uncertainties of the electroweak precision observables is given. An
updated version of a simple numerical parameterisation of the result for M_W is
presented. Furthermore, leading electroweak two-loop contributions to the
precision observables within the MSSM are discussed.Comment: 6 pages, Proceedings contribution to RADCOR 2002 - Loops & Legs 2002,
Kloster Banz, Germany, Sept. 200
Current Bounds on Technicolor with Scalars
Technicolor with scalars is the simplest dynamical symmetry breaking model
and one in which the predicted values of many observables may be readily
calculated. This letter applies current LEP, Tevatron, CESR, and SLAC data from
searches for neutral and charged scalars and from studies of b-quark physics to
obtain bounds on technicolor with scalars. Expectations for how upcoming
measurements will further probe the theory's parameter space are also
discussed.Comment: 9 pages, 2 figures, LaTe
Bounds on the Higgs-Boson Mass in the Presence of Non-Standard Interactions
The triviality and vacuum stability bounds on the Higgs-boson mass are
revisited in the presence of new interactions parameterized in a
model-independent way by an effective lagrangian. When the scale of new physics
is below 50 TeV the triviality bound is unchanged but the stability lower bound
is increased by 40-60 GeV. Should the Higgs-boson mass be close to its current
lower experimental limit, this leads to the possibility of new physics at the
scale of a few TeV, even for modest values of the effective lagrangian
parameters.Comment: 5 pages, 2 figures, RevTex, submitted to PR
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