5 research outputs found
Deuteron life-time in hot and dense nuclear matter near equilibrium
We consider deuteron formation in hot and dense nuclear matter close to
equilibrium and evaluate the life-time of the deuteron fluctuations within the
linear response theory. To this end we derive a generalized linear Boltzmann
equation where the collision integral is related to equilibrium correlation
functions. In this framework we then utilize finite temperature Green functions
to evaluate the collision integrals. The elementary reaction cross section is
evaluated within the Faddeev approach that is suitably modified to reflect the
properties of the surrounding hot and dense matter.Comment: 15 pages, 5 figure
Inclusive Production Cross Sections from 920 GeV Fixed Target Proton-Nucleus Collisions
Inclusive differential cross sections and
for the production of \kzeros, \lambdazero, and
\antilambda particles are measured at HERA in proton-induced reactions on C,
Al, Ti, and W targets. The incident beam energy is 920 GeV, corresponding to
GeV in the proton-nucleon system. The ratios of differential
cross sections \rklpa and \rllpa are measured to be and , respectively, for \xf . No significant dependence upon the
target material is observed. Within errors, the slopes of the transverse
momentum distributions also show no significant
dependence upon the target material. The dependence of the extrapolated total
cross sections on the atomic mass of the target material is
discussed, and the deduced cross sections per nucleon are
compared with results obtained at other energies.Comment: 17 pages, 7 figures, 5 table
Fast beam conditions monitor BCM1F for the CMS experiment
The CMS Beam Conditions and Radiation Monitoring System, BRM, will support
beam tuning, protect the CMS detector from adverse beam conditions, and measure
the accumulated dose close to or inside all sub-detectors. It is composed of
different sub-systems measuring either the particle flux near the beam pipe
with time resolution between nano- and microseconds or the integrated dose over
longer time intervals. This paper presents the Fast Beam Conditions Monitor,
BCM1F, which is designed for fast flux monitoring measuring both beam halo and
collision products. BCM1F is located inside the CMS pixel detector volume close
to the beam-pipe. It uses sCVD diamond sensors and radiation hard front-end
electronics, along with an analog optical readout of the signals. The
commissioning of the system and its successful operation during the first be
ams of the LHC are described.Comment: 15 pages, 12 figure