8,862 research outputs found
CMS Central Hadron Calorimeter
We present a description of the CMS central hadron calorimeter. We describe
the production of the 1996 CMS hadron testbeam module. We show the results of
the quality control tests of the testbeam module. We present some results of
the 1995 CMS hadron testbeam.Comment: 7 pages, 11 Figures, corresponding author: H. Budd, [email protected]
Parity-violating longitudinal response
The longitudinal quasielastic parity-violating electron scattering response
is explored within the context of a model that builds antisymmetrized RPA-HF
correlations on a relativistic Fermi gas basis. The large sensitivity to
nuclear dynamics of this observable, found in previous studies where only
pionic correlations were included, is shown to survive in the present model
where the effects from pion, rho, sigma and omega exchange in a version of the
Bonn potential are incorporated. Through an intricate diagrammatic
cancellation/filtration mechanism the longitudinal parity-violating response
turns out to be close to the one obtained in first-order perturbation theory
with the pion alone. Finally, in accord with our previous work, the
parity-violating response is seen to display appreciable sensitivity to the
electric strangeness content of the nucleon, especially at high momentum
transfer.Comment: 13 pages, uses REVTeX and epsfig, 10 postscript figures; a postscript
version of the paper is available by anonymous ftp at
ftp://carmen.to.infn.it/pub/barbaro/papers/951
Superscaling in electron- and neutrino-nucleus scattering
The superscaling properties of electron scattering data are used to extract
model-independent predictions for neutrino-nucleus cross sections.Comment: Contibution to NuInt05, 4th international workshop on
neutrino-nucleus interaction in the few GeV region, Sept. 26 - 29 2005,
Okayama, Japa
Design and construction of CMS central hadron calorimeter
The hadron calorimeter ( HCAL) for the Compact Muon Solenoid Detector ( CMS) covers the central pseudorapidity region ( eta <3.0). It is a sampling calorimeter with brass absorber plates interspersed with scintillator readout plates. In this note, we discuss test beam results used in the optimization of the final design of the calorimeter and report on the status of the construction of the absorber and scintillator packages of HCAL
Phase Transitions in a Kinetic Flocking Model of Cucker-Smale Type
We consider a collective behavior model in which individuals try to imitate each others' velocity and have a preferred speed. We show that a phase change phenomenon takes place as diffusion decreases, bringing the system from a âdisorderedâ to an âorderedâ state. This effect is related to recently noticed phenomena for the diffusive Vicsek model. We also carry out numerical simulations of the system and give further details on the phase transition
Fiber R and D for the CMS HCAL
This paper documents the fiber R and D for the CMS hadron barrel calorimeter
(HCAL). The R and D includes measurements of fiber flexibility, splicing,
mirror reflectivity, relative light yield, attenuation length, radiation
effects, absolute light yield, and transverse tile uniformity. Schematics of
the hardware for each measurement are shown. These studies are done for
different diameters and kinds of multiclad fiber.Comment: 23 pages, 30 Figures 89 pages, 41 figures, corresponding author: H.
Budd, [email protected]
Antisymmetrized random phase approximation for quasielastic scattering in nuclear matter: Non-relativistic potentials
Many-body techniques for the calculation of quasielastic nuclear matter
response functions in the fully antisymmetrized random phase approximation on a
Hartree-Fock basis are discussed in detail. The methods presented here allow
for an accurate evaluation of the response functions with little numerical
effort. Formulae are given for a generic non-relativistic potential
parameterized in terms of meson exchanges; on the other hand, relativistic
kinematical effects have been accounted for.Comment: 27 pages, 7 figures; uses revtex and epsfig; minor changes; typos in
some formulae have been corrected and references have been adde
Skewed recoil polarization in (e,e'p) reactions from polarized nuclei
The general formalism describing reactions,
involving polarization of the electron beam, target and ejected proton, is
presented within the framework of the relativistic plane wave impulse
approximation for medium and heavy nuclei. It is shown that the simultaneous
measurement of the target and ejected proton polarization can provide new
information which is not contained in the separate analysis of the
and reactions. The polarization
transfer mechanism in which the electron interacts with the initial nucleon
carrying the target polarization, making the proton exit with a fractional
polarization in a different direction, is referred to here as ``skewed
polarization''. The new observables characterizing the process are identified,
and written in terms of polarized response functions and asymmetries which are
of tensor nature. The corresponding half-off-shell single-nucleon responses are
analyzed using different prescriptions for the electromagnetic vertex and for
different kinematics. Numerical predictions are presented for selected
perpendicular and parallel kinematics in the case of K as polarized
target.Comment: 30 pages, 8 figure
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