55 research outputs found
Atom holography
We study the conditions under which atomic condensates can be used as a
recording media and then suggest a reading scheme which allows to reconstruct
an object with atomic reading beam. We show that good recording can be achieved
for flat condensate profiles and for negative detunings between atomic Bohr
frequency and optical field frequency. The resolution of recording dramatically
depends on the relation between the healing length of the condensate and the
spatial frequency contents of the optical fields involved.Comment: 8 pages, 5 figures, Late
Radiative Corrections to Polarized Inelastic Scattering in Coincidence
The coplete analysis of the model-independent leading radiative corrections
to cross-section and polarization observables in semi-inclusive deep-inelastic
electron-nucleus scattering with detection of a proton and scattered electron
in coincidence has been performed. The basis of the calculations consists of
the Drell-Yan like representation in electrodynamics for both spin-independent
and spin-dependent parts of the cross-section in terms of the electron
structure functions. The applications to the polarization transfer effect from
longitudinally polarized electron beam to detected proton as well as to
scattering by the polarized target are considered.Comment: 18p, to be published in JET
Inverse bremsstrahlung contributions to Drell-Yan like processes
The contribution of the sub-process in
hadron-hadron interactions is considered. It is a part of one-loop electroweak
radiative corrections for the Drell-Yan production of lepton pairs at hadron
colliders. It is shown that this contribution should be taken into account
aiming at the 1% accuracy of the Drell-Yan process theoretical description.
Both the neutral and charged current cases are evaluated. Numerical results are
presented for typical conditions of LHC experiments.Comment: 11 pages, 8 figure
DIRAC - Distributed Infrastructure with Remote Agent Control
This paper describes DIRAC, the LHCb Monte Carlo production system. DIRAC has
a client/server architecture based on: Compute elements distributed among the
collaborating institutes; Databases for production management, bookkeeping (the
metadata catalogue) and software configuration; Monitoring and cataloguing
services for updating and accessing the databases. Locally installed software
agents implemented in Python monitor the local batch queue, interrogate the
production database for any outstanding production requests using the XML-RPC
protocol and initiate the job submission. The agent checks and, if necessary,
installs any required software automatically. After the job has processed the
events, the agent transfers the output data and updates the metadata catalogue.
DIRAC has been successfully installed at 18 collaborating institutes, including
the DataGRID, and has been used in recent Physics Data Challenges. In the near
to medium term future we must use a mixed environment with different types of
grid middleware or no middleware. We describe how this flexibility has been
achieved and how ubiquitously available grid middleware would improve DIRAC.Comment: Talk from the 2003 Computing in High Energy and Nuclear Physics
(CHEP03), La Jolla, Ca, USA, March 2003, 8 pages, Word, 5 figures. PSN
TUAT00
APPROXIMATE CALCULATIONS OF TEMPERATURE FIELDS IN CYLINDRICAL SLUGS OF DIFFERENT GRADES OF STEELS
The offered calculation procedure allows to determine with adequate accuracy the temperature dynamics by section of slug depending on time
A spatiotemporal representation of the electromagnetic field radiated by short-pulse superwideband antennas
Study of Brain Bioelectrical Activity Maturation in Northern Schoolchildren with Integral Parameters of Multichannel EEG
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