2,849 research outputs found
Top quark precision physics at the International Linear Collider
Top quark production in the process at a future
linear electron positron collider with polarized beams is a powerful tool to
determine the scale of new physics. Studies at the \ttbar threshold will
allow for precise determination of the top quark mass in a well defined
theoretical framework. At higher energies vector, axial vector and tensorial CP
conserving couplings can be separately determined for the photon and the
component in the electro-weak production process. The sensitivity to new
physics would be dramatically improved w.r.t. to what expected from LHC for
electroweak couplings.Comment: White paper for Snowmass CSS 201
New results for a photon-photon collider
We present new results from studies in progress on physics at a two-photon
collider. We report on the sensitivity to top squark parameters of MSSM Higgs
boson production in two-photon collisions; Higgs boson decay to two photons;
radion production in models of warped extra dimensions; chargino pair
production; sensitivity to the trilinear Higgs boson coupling; charged Higgs
boson pair production; and we discuss the backgrounds produced by resolved
photon-photon interactions.Comment: 17 pages, 15 figure
Study of \Lambda - \Lambdabar Oscillation in quantum coherent \Lambda\Lambdabar state by using J/\psi \to \Lambda \bar{\Lambda}$ decay
We discuss the possibility of searching for the \Lam - \Lamb oscillations
for coherent \Lam\Lamb production in the J/\psi \to \Lam \Lamb decay
process. The sensitivity of measurement of \Lam -\Lamb oscillation in the
external field at BES-III experiment is considered. These considerations
indicate an alternative way to probe the amplitude in addition to
neutron oscillation experiments. Both coherent and time-dependent information
can be used to extract the \Lam-\Lamb oscillation parameter. With one year's
luminosity at BES-III, we can set an upper limit of \delta m_{\Lam \Lamb} <
10^{-15} MeV at 90% confidence level, corresponding to about s of
\Lam-\Lamb oscillation time.Comment: 4 pages, no figure, minor corrections to improve grammar, published
in Phys.Rev.D as Rapid Communication
First ADS analysis of B- -> D0K- decays in hadron collisions
Proceedings of DISCRETE 2010, Symposium on Prospects in the Physics of
Discrete Symmetries, Rome (IT), 6-11 December 2010Comment: 7 pages, 5 figure
Clinical Disease Severity of Respiratory Viral Co-Infection versus Single Viral Infection: A Systematic Review and Meta-Analysis.
BACKGROUND: Results from cohort studies evaluating the severity of respiratory viral co-infections are conflicting. We conducted a systematic review and meta-analysis to assess the clinical severity of viral co-infections as compared to single viral respiratory infections.
METHODS: We searched electronic databases and other sources for studies published up to January 28, 2013. We included observational studies on inpatients with respiratory illnesses comparing the clinical severity of viral co-infections to single viral infections as detected by molecular assays. The primary outcome reflecting clinical disease severity was length of hospital stay (LOS). A random-effects model was used to conduct the meta-analyses.
RESULTS: Twenty-one studies involving 4,280 patients were included. The overall quality of evidence applying the GRADE approach ranged from moderate for oxygen requirements to low for all other outcomes. No significant differences in length of hospital stay (LOS) (mean difference (MD) -0.20 days, 95% CI -0.94, 0.53, pâ=â0.59), or mortality (RR 2.44, 95% CI 0.86, 6.91, pâ=â0.09) were documented in subjects with viral co-infections compared to those with a single viral infection. There was no evidence for differences in effects across age subgroups in post hoc analyses with the exception of the higher mortality in preschool children (RR 9.82, 95% CI 3.09, 31.20, p<0.001) with viral co-infection as compared to other age groups (I2 for subgroup analysis 64%, pâ=â0.04).
CONCLUSIONS: No differences in clinical disease severity between viral co-infections and single respiratory infections were documented. The suggested increased risk of mortality observed amongst children with viral co-infections requires further investigation
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