95046088
PROTON-PROTON AND PROTON-ANTIPROTON CROSS-SECTIONS AT VERY HIGH ENERGIES
122703990
Gravitational collapse of a massless scalar field and a perfect fluid with self-similarity of the second kind in (2 + 1) dimensions
Self-similar solutions of a collapsing perfect fluid and a massless scalar field with kinematic self-similarity of the first kind in 2+1 dimensions are obtained. The local and global properties of the solutions are studied. It is found that some of them represent gravitational collapse, in which black holes are always formed, and some may be interpreted as representing cosmological models.
14001752
Model of the stochastic vacuum and QCD parameters
Abstract Accounting for the two independent correlation functions of the QCD vacuum, we improve the simple and consistent description given by the model of the stochastic vacuum to the high-energy pp and p p data, with a new determination of parameters of non-perturbative QCD. The increase of the hadronic radii with the energy accounts for the energy dependence of the observables.
118996850
Eikonal profile functions and amplitudes for $p p$ and $\bar{p} p$ scattering
The eikonal profile function $J(b)$ obtained from the model of the stochastic vacuum is parametrized in a form suitable for comparison with experiment. The amplitude and the extended profile function (including imaginary and real parts) are determined directly from the complete pp and $\overline{p}p$ elastic scattering data at high energies. A full and accurate representation of the data is presented, with a smooth energy dependence of all parameters. The changes needed in the original profile function required for the description of scattering beyond the forward direction are described.
18756117
Gravitational Collapse of a Massless Scalar Field and a Perfect Fluid with Self-Similarity of the First Kind in (2+1) Dimensions
Self-similar solutions of a collapsing perfect fluid and a massless scalar field with kinematic selfsimilarity of the first kind in 2+1 dimensions are obtained. Their local and global properties of the solutions are studied. It is found that some of them represent gravitational collapse, in which black holes are always formed, and some may be interpreted as representing cosmological models.
118371514
Derivative dispersion relations beyond the forward direction
We study derivative dispersion relations for t not zero, investigating properties of real and imaginary amplitudes in pp and pp elastic scatterings.
121932121
THCOBRA: Ion back flow reduction in patterned THGEM cascades
A new concept for avalanche ion back-flow (IBF) reduction in cascaded gaseous detectors is presented. The Thick-COBRA is a Thick-GEM (THGEM) with a patterned electrode, aiming at reducing secondary effects by trapping avalanche ions. The patterned electrode faces the electron drift region, trapping ions flowing back from the cascaded multiplier and those produced within the Thick-COBRA. Total IBF values of about 5% were obtained, about six times below that reached with a THGEM in a triple-THGEM configuration, keeping full single-electron detection efficiency. Experimental and simulation studies of IBF and electron collection/transmission efficiencies are presented; the suitability for application of Thick-COBRA in photon detectors for RICH is discussed.