121 research outputs found
A new realistic many-body approach for the description of high-energy scattering processes off complex nuclei
A linked cluster expansion for the calculation of ground state observables of
nuclei with realistic interactions has been developed. Using the V8' potential
the ground state energy, density and momentum distribution of complex nuclei
have been calculated and found to be in good agreement with the results
obtained within the Fermi Hyper Netted Chain, and Variational Monte Carlo
approaches. Using the same cluster expansion, with wave function and
correlations parameters fixed from the calculation of the ground-state
observables, various high energy scattering processes off complex nuclei have
been calculated taking final state interaction effects into account by means of
the Glauber multiple scattering series.Comment: 7 pages, 4 figures, presented by M. Alvioli at the "13th
International Conference on Recent Progress in Many-Body Theories", Buenos
Aires - Argentina, 5-9 December 200
Testing the Gaussian Approximation to the JIMWLK Equation
In processes involving small-x partons, like in deep inelastic scattering and
in hadronic collisions at high energy, the final state can be expressed in
terms of correlators of Wilson lines. We study such high-point correlators
evolving according to the JIMWLK equation and we confirm the results of
previous numerical and analytic work, by using an independent method, that the
solution to the JIMWLK equation can be very well approximated by an appropriate
Gaussian wavefunction. We explore both fixed and running coupling evolution,
where in the latter the scale is set according to various prescriptions. As a
byproduct, we also numerically confirm to high accuracy the validity of the law
governing the behavior of the S-matrix close to the unitarity limit, the
Levin-Tuchin formula. We furthermore outline how to calculate correlators with
open color indices.Comment: 25 pages, 11 figures. v2: minor corrections, one equation added,
updated to match published versio
Realistic calculations of correlations and final state interaction effects in the A(e,e'p)X process off complex nuclei
A linked cluster expansion for the calculation of ground state observables of
complex nuclei with realistic interactions has been used to calculate the
ground state energy, density and momentum distribution of 16O and 40Ca. Using
the same cluster expansion and the wave function and correlation parameters
obtained from the energy calculation, we have evaluated the semi inclusive
reaction A(e,e'p)X taking final state interaction (FSI) into account by a
Glauber type approach; the comparison between the distorted and undistorted
momentum distributions provides an estimate of the transparency of the nuclear
medium to the propagation of the hit proton. The effect of color transparency
is also included by considering the Finite Formation Time (FFT) that the hit
hadron needs to reach its asymptotic physical state.Comment: 8 pages, Latex, 8 figures, presented at the "2nd International
Conference on Nuclear and Particle Physics with CEBAF at JLab
A Monte Carlo generator of nucleon configurations in complex nuclei including Nucleon-Nucleon correlations
We developed a Monte Carlo event generator for production of nucleon
configurations in complex nuclei consistently including effects of
Nucleon-Nucleon (NN) correlations. Our approach is based on the Metropolis
search for configurations satisfying essential constraints imposed by short-
and long-range NN correlations, guided by the findings of realistic
calculations of one- and two-body densities for medium-heavy nuclei. The
produced event generator can be used for Monte Carlo (MC) studies of pA and AA
collisions. We perform several tests of consistency of the code and comparison
with previous models, in the case of high energy proton-nucleus scattering on
an event-by-event basis, using nucleus configurations produced by our code and
Glauber multiple scattering theory both for the uncorrelated and the correlated
configurations; fluctuations of the average number of collisions are shown to
be affected considerably by the introduction of NN correlations in the target
nucleus. We also use the generator to estimate maximal possible gluon nuclear
shadowing in a simple geometric model.Comment: 7 pages, 8 figures; removed one figure, reduced length; to be
published in Phys. Lett.
Proton Decay: Improving the sensitivity through nuclear dynamics?
The kinematics of the decay of a bound proton is governed by the proton
spectral function. We evaluate this quantity in 16O using the information from
nuclear physics experiments. It also includes a correlated part. The
reliability of this evaluation is sufficient to open the possibility of
correlated cuts in the missing mass and momentum variables in order to identify
the decay events from the bound protons with a possible increase of the signal
to noise ratio.Comment: 6 pages, 6 figures. CERN preprint: CERN-PH-TH/2010-036. To appear in
Phys Rev
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