3,398 research outputs found
New Physics Searches at the Tevatron and the LHC
The Tevatron Run-II started data-taking in spring 2001 and several searches
for new particles have been performed. The preliminary 2005 results are
concisely reviewed for the experiments CDF and D0. Model-independent and
model-dependent limits on Higgs boson and Supersymmetric particle production
are set and interpretations are given. Several limits from the LEP era have
been extended. The outlook for the Tevatron and the prospects for the ATLAS and
CMS experiments at the LHC for selected searches are briefly addressed.Comment: 32 pages, 44 figures, presented at PHENO'05 and Aspen Collider
Physics Workshop 200
Heavy Flavour results from Tevatron
The CDF and D0 experiments finalize the analysis of their full statistics
collected in the collisions at a center-of-mass energy of TeV at the Fermilab Tevatron collider. This paper presents several new
results on the properties of hadrons containing heavy - and -quarks
obtained by both collaborations. These results include the search for the rare
decays (CDF), the study of CP asymmetry in decay (CDF, D0), the measurement of the like-sign dimuon charge
asymmetry (D0), the measurement of CP asymmetry in and decays (CDF), and the new measurement of the branching fraction (CDF). Both experiments still expect
to produce more results on the properties of heavy flavours.Comment: Contribution to the XLVIIth Rencontres de Moriond session devoted to
Electroweak Interactions and Unified Theorie
Precision Measurement of a Particle Mass at the Linear Collider
Precision measurement of the stop mass at the ILC is done in a method based
on cross-sections measurements at two different center-of-mass energies. This
allows to minimize both the statistical and systematic errors. In the framework
of the MSSM, a light stop, compatible with electro-weak baryogenesis, is
studied in its decay into a charm jet and neutralino, the Lightest
Supersymmetric Particle(LSP), as a candidate of dark matter. This takes place
for a small stop-neutralino mass difference.Comment: 6 pages, 4 figures, 3tables,
Conference(Workshop)-LCWS/ILC2007-June,2,200
A Method for the Precision Mass Measurement of the Stop Quark at the International Linear Collider
Many supersymmetric models predict new particles within the reach of the next
generation of colliders. For an understanding of the model structure and the
mechanism(s) of symmetry breaking, it is important to know the masses of the
new particles precisely. In this article the measurement of the mass of the
scalar partner of the top quark (stop) at an e+e- collider is studied. A
relatively light stop is motivated by attempts to explain electroweak
baryogenesis and can play an important role in dark matter relic density. A
method is presented which makes use of cross-section measurements near the
pair-production threshold as well as at higher center-of-mass energies. It is
shown that this method not only increases the statistical precision, but also
greatly reduces the systematic uncertainties, which can be important. Numerical
results are presented, based on a realistic event simulation, for two signal
selection strategies: using conventional selection cuts, and using an Iterative
Discriminant Analysis (IDA). Our studies indicate that a precision of
\Delta\mstop = 0.42 GeV can be achieved, representing a major improvement
over previous studies. While the analysis of stops is particularly challenging
due to the possibility of stop hadronization, the general procedure could be
applied to the mass measurement of other particles as well. We also comment on
the potential of the IDA to discover a stop quark in this scenario, and we
revisit the accuracy of the theoretical predictions for the neutralino relic
densityComment: 41 pages, 14 figures, in JHEP forma
LongâWavelength Sinuosity of Linear Dunes on Earth and Titan and the Effect of Underlying Topography
AbstractOn both Earth and Titan, some linear dunefields are characterized by curvilinear patterning atypical of the regularity and straightness of typical longitudinal dunefields. We use remotely sensed imagery and an automated dune crestline detection algorithm to analyze the controls on spatial patterning. Here it is shown that topography can influence the patterning, as dune alignments bend to deflect downslope under the influence of gravity. The effect is pronounced in a terrestrial dunefield (the Great Sandy desert, Australia) where substantial topography underlies, but is absent where the dunefield is underlain by subdued relief (southwestern Kalahari). This knowledge allows the inference of subtle topographic changes underlying dunefields from dunefield patterning, where other sources of elevation data may be absent. This methodology is explored using the Belet Sand Sea of Titan, where likely areas of topographic change at resolutions finer than those currently available from radar altimetry are inferred.</jats:p
New evidence for super-roughening in crystalline surfaces with disordered substrate
We study the behavior of the Binder cumulant related to long distance
correlation functions of the discrete Gaussian model of disordered substrate
crystalline surfaces. We exhibit numerical evidence that the non-Gaussian
behavior in the low- region persists on large length scales, in agreement
with the broken phase being super-rough.Comment: 10 pages and 4 figures, available at
http://chimera.roma1.infn.it/index_papers_complex.html . We have extended the
RG discussion and minor changes in the tex
An Open-Label Study of the Long-Term Safety of Pirfenidone in Patients with Idiopathic Pulmonary Fibrosis (RECAP)
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