226 research outputs found
Effects of the large gluon polarization on and J/ productions at polarized ep and pp collisions
The recent SMC data of are reproduced with the large polarized
gluons. To study further the polarized gluon distribution in a proton, we
calculate the spin--dependent differential cross section for J/
leptoproductions and the two--spin asymmetry for J/ hadroproductions. Its
experimental implication is discussed.Comment: LaTeX file, 10 pages+6 figures available upon request, KOBE-FHD-93-0
Universal Behavior of Correlations between Eigenvalues of Random Matrices
The universal connected correlations proposed recently between eigenvalues of
unitary random matrices is examined numerically. We perform an ensemble average
by the Monte Carlo sampling. Although density of eigenvalues and a bare
correlation of the eigenvalues are not universal, the connected correlation
shows a universal behavior after smoothing.Comment: ISSP-September-199
High Resolution Intravital Imaging of Subcellular Structures of Mouse Abdominal Organs Using a Microstage Device
Intravital imaging of brain and bone marrow cells in the skull with subcellular resolution has revolutionized neurobiology, immunology and hematology. However, the application of this powerful technology in studies of abdominal organs has long been impeded by organ motion caused by breathing and heartbeat. Here we describe for the first time a simple device designated âmicrostageâ that effectively reduces organ motions without causing tissue lesions. Combining this microstage device with an upright intravital laser scanning microscope equipped with a unique stick-type objective lens, the system enables subcellular-level imaging of abdominal organs in live mice. We demonstrate that this technique allows for the quantitative analysis of subcellular structures and gene expressions in cells, the tracking of intracellular processes in real-time as well as three-dimensional image construction in the pancreas and liver of the live mouse. As the aforementioned analyses based on subcellular imaging could be extended to other intraperitoneal organs, the technique should offer great potential for investigation of physiological and disease-specific events of abdominal organs. The microstage approach adds an exciting new technique to the in vivo imaging toolbox
SPring-8 LEPS2 beamline: A facility to produce a multi-GeV photon beam via laser Compton scattering
We have constructed a new laser-Compton-scattering facility, called the LEPS2
beamline, at the 8-GeV electron storage ring, SPring-8. This facility provides
a linearly polarized photon beam in a tagged energy range of 1.3--2.4 GeV.
Thanks to a small divergence of the low-emittance storage-ring electrons, the
tagged photon beam has a size (sigma) suppressed to about 4 mm even after it
travels about 130 m to the experimental building that is independent of the
storage ring building and contains large detector systems. This beamline is
designed to achieve a photon beam intensity higher than that of the first
laser-Compton-scattering beamline at SPring-8 by adopting the simultaneous
injection of up to four high-power laser beams and increasing a transmittance
for the long photon-beam path up to about 77%. The new beamline is under
operation for hadron photoproduction experiments
A study on the sharp knee and fine structures of cosmic ray spectra
The paper investigates the overall and detailed features of cosmic ray (CR)
spectra in the knee region using the scenario of nuclei-photon interactions
around the acceleration sources. Young supernova remnants can be the physical
realities of such kind of CR acceleration sites. The results show that the
model can well explain the following problems simultaneously with one set of
source parameters: the knee of CR spectra and the sharpness of the knee, the
detailed irregular structures of CR spectra, the so-called "component B" of
Galactic CRs, and the electron/positron excesses reported by recent
observations. The coherent explanation serves as evidence that at least a
portion of CRs might be accelerated at the sources similar to young supernova
remnants, and one set of source parameters indicates that this portion mainly
comes from standard sources or from a single source.Comment: 13 pages, 4 figures, accepted for publication in SCIENCE CHINA
Physics, Mechanics & Astronomy
Moduli Effects on Neutrino Oscillations
We point out the possibility to detect the low-energy signals of moduli in
the superstring theory through the neutrino oscillation. The idea is based on
the characteristics that the couplings of moduli are different from matter to
matter. We estimate the oscillation probability both in the baseline and solar
neutrino oscillations. In both cases, when there is at least one modulus of
which mass is less than or equal to GeV, the interaction of the
modulus significantly changes the conversion probability from one neutrino
flavor to another.Comment: 17pages, Latex, 3 figures (available from the author upon request by
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