9,485 research outputs found
Relativistic Quantum Thermodynamics of Ideal Gases in 2 Dimensions
In this work we study the behavior of relativistic ideal Bose and Fermi gases
in two space dimensions. Making use of polylogarithm functions we derive a
closed and unified expression for their densities. It is shown that both type
of gases are essentially inequivalent, and only in the non-relativistic limit
the spinless and equal mass Bose and Fermi gases are equivalent as known in the
literature.Comment: 6 pages, 1 figur
The decay : a complete 1-loop calculation in the MSSM
In the minimal supersymmetric standard model the decay of
the light neutral scalar is kinematically allowed for low values of
when radiative corrections to the neutral Higgs masses are taken
into account. The width of this decay mode is revisited on the basis of a
complete 1-loop diagrammatic calculation. We give the analytical expressions
and numerical results and compare them with the corresponding ones from the
simpler and compact approximations of the effective potential method and the
renormalization group approach.Comment: 25 pages, LaTex, 10 figures included. Complete ps-file also available
via WWW at http://itpaxp1.physik.uni-karlsruhe.de/prep/prep.htm
Launch Risk Acceptability: The Public Speaks
The perspective of those assuming risk has become increasingly important to launch agencies. The IAASS white paper "An ICAO for Space?" proposed four ultimate goals of any international regulatory framework. The first of these was to "Ensure that citizens of all nations are equally protected from "unreasonable levels" of risk from overflight by missiles, launch vehicles and returning spacecraft". A key component of this concept is the issue of what is an "unreasonable level" of risk from the perspective of those assuming the risk
CP sensitive observables in chargino production and decay into a W boson
We study CP sensitive observables in chargino production in electron-positron
collisions with subsequent two-body decay of one chargino into a W boson. We
identify the CP odd elements of the W boson density matrix and propose CP
sensitive triple-product asymmetries of the chargino decay products. We
calculate the density-matrix elements, the CP asymmetries and the cross
sections in the Minimal Supersymmetric Standard Model with complex parameters
\mu and M_1 for an e+ e- linear collider with \sqrt{s} = 800 GeV and
longitudinally polarized beams. The asymmetries can reach 7% and we discuss the
feasibility of measuring these asymmetries.Comment: 23 pages, 7 figure
Higgs decays in the Two Higgs Doublet Model: Large quantum effects in the decoupling regime
We study the Higgs-boson decays h0 -> b \bar{b}, h0 -> \gamma \gamma and h0
-> \gamma Z within the framework of the Two Higgs Doublet Model (THDM) in the
context of the decoupling regime, together with tree level unitarity
constraints. We show that when the light CP-even Higgs boson of the THDM mimics
the Standard-Model Higgs boson, not only the one-loop effects to h0 -> {\gamma
\gamma ,\gamma Z} but also the one-loop contribution to h0 -> b \bar{b} can be
used to distinguish between THDM and SM. The size of the quantum effects in h0
-> b \bar{b} are of the same order as in h0 -> {\gamma \gamma ,\gamma Z} and
can reach 25% in both cases.Comment: LaTeX, 13 pages, 5 figures. Improved text, added references, appendix
removed. Version to appear in PL
Radiative Corrections to the Vertex and Constraints on Extended Higgs Sectors
We explore the radiative corrections to the process in
models with extended Higgs sectors. The observables and the coupling asymmetry, , are sensitive to these corrections. We
present general formulae for the one-loop corrections to and in an
arbitrary extended Higgs sector, and derive explicit results for a number of
specific models. We find that in models containing only doublets, singlets, or
larger multiplets constrained by a custodial symmetry so that at tree level, the one-loop corrections due to virtual
charged Higgs bosons always worsen agreement with experiment. The
measurement can be used to set lower bounds on the charged Higgs masses.
Constraints on models due to the one-loop contributions of neutral Higgs bosons
are also examined.Comment: 54 pages, 11 figure
Alcoholic Liver Disease in Asia, Europe, and North America
Alcoholic liver diseases comprise a spectrum of clinical disorders and changes in liver tissue that can be detected by pathology analysis. These range from steatosis to more severe signs and symptoms of liver disease associated with inflammation, such as those observed in patients with alcoholic hepatitis or cirrhosis. Although the relationship between alcohol consumption and liver disease is well established, severe alcohol-related morbidities develop in only a minority of people who consume alcohol in excess. Inter-individual differences in susceptibility to the toxic effects of alcohol have been studied extensively-they include pattern of alcohol consumption, sex, environmental factors (such as diet), and genetic factors, which vary widely among different parts of the world. Alcoholic liver disease is becoming more common in many parts of Asia, but is decreasing in Western Europe. Treatment approaches, including availability of medications, models of care, and approach to transplantation, differ among regions
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