124110052
Parton-cluster model of hadrons and impact parameter structure of non-diffractive collisions
A model of hadron structure and hadron collisions is proposed for interpreting experimental data. It starts from the assumption that a hadron consists of a number of partons with very large masses which are grouped inside hadrons into clusters with quantum numbers of the known hadrons. In hadron collisions the most peripheral clusters behave as spectators and represent leading particles; non-diffractive hadron collisions can then be interpreted mostly as stripping-like reactions. It is shown on a sample of annihilation and non-annihilation pp collisions at 5·7 GeV/c that experimental data for several different leading particles are in good qualitative agreement with the basic requirement of the model which concerns the strong impact parameter angular dependence of the leading particles.
121692314
Test of a compact Si-strip detector for the forward region in DELPHI
Abstract The DELPHI detector will be upgraded by a new silicon detector in the very forward region to fulfil the physics demands of the LEP200 program. This detector will cover the angular region between 10° and 25° with respect to the beam pipe and will have a two dimensional readout. The severe space restrictions in this region lead us to develop a new arrangement of detectors and electronic hybrids. In beam tests the layout of the detectors was optimised. Special attention was given to the charge loss in intermediate strips for detectors with large strip pitch. Beam test results obtained with different detector layouts, e.g. various implant widths, and different angle of the incident particles will be shown.
110037616
The results of mass testing of the plastic streamer tubes for the DELPHI hadron calorimeter
Abstract The procedure and results of mass testing of plastic streamer tubes for the DELPHI hadron calorimeter are described in detail. The mass testing includes three stages: high voltage test and conditioning, X-ray test on radiation load capability and wire tension control in ready detectors. The productivity of the test workshop was 240 detectors per day at maximum. After testing of about 25 000 streamer tubes, 8% have been rejected on the ground of severe rejection criteria which exceed significantly the working conditions in the DELPHI experiment.
109716342
Monitoring setup of Prague T2 site
Quality monitoring is a crucial part in struggle for reliability of every Tier 2 site. We present a solution based on Nagios installation in Prague. Our solution includes both third party and in-house developed add-ons and plug-ins. We focus on integrating results from grid-wise monitoring tools (such as SAM or Gstat) at one place (our Nagios instance). We also present an automated way to generate configuration files for Nagios from local database of hardware and services.
186674866
The First Three TILECAL Submodule Assembly in Prague
136300702
RD19: status report on 1993 development of hybrid and monolithic silicon micropattern detectors
115913744
To the theory of high-energy elastic nucleon collisions
The commonly used West and Yennie integral formula for the relative phase between the Coulomb and elastic hadronic amplitudes requires for the phase of the elastic hadronic amplitude to be constant at all kinematically allowed values of t. More general interference formula based on the eikonal model approach does not exhibit such limitation. The corresponding differences will be demonstrated and some predictions of different phenomenological models for elastic pp scattering at energy of 14 TeV at the LHC will be given. Special attention will be devoted to determination of luminosity from elastic scattering data; it will be shown that the systematic error might reach till 5 % if the luminosity is derived from the values in the center of the interference region with the help of West and Yennie formula.
121375652
DESCRIPTION OF HIGH-ENERGY ELASTIC HADRON SCATTERING IN BOTH THE COULOMB AND HADRONIC DOMAINS
Though the current model of elastic hadron scattering (based on West and Yennie formula) is based on some basic assumptions being not in harmony with the known experimental facts, it is still used in analyzing measured data. These assumptions are critically examined and possible consequences following from a more general model approach are discussed.
116197291
High-Energy Elastic Scattering and Nucleon Structure
The current model of elastic nucleon scattering based on hadronic amplitude with dominant imaginary part is still made use of in analyses of measured data even if it involves assumptions being not in harmony with known experimental facts. These assumptions are critically examined and a more general model is considered. Possible consequences following for elastic and diffractive production channels from such a model approach are discussed. An opaque nucleon structure against a transparent one is shown to be preferred.
121853587
Predictions on the total cross-section and real part at LHC and SSC
Abstract An overall fit to the data on the total cross section and on the real part of the forward amplitude for p p and pp was performed using dispersion relations. The energy dependence of the total cross section was studied up to s = 100 TeV . Numerical predictions are presented for LHC and SSC energies.
119975839
Impact parameter structure derived from elastic collisions
Impact parameter profiles derived from elastic scattering data within the framework of standard model cannot be regarded as definite being burdened by two defficiences: influenced strongly by an a priori (physically non-reasoned) assumption and by non-unique relation to elastic hadron amplitude. A mathematically consistent general model providing a unique relation is presented and some new formulas allowing to evaluate mean-square values of corresponding impact parameters (for elastic and inelastic processes directly from the t dependent amplitude) are introduced. Critical arguments against the mentioned a priori assumption are discussed as well.