46 research outputs found
An Approach to Automatic Indexing of Scientific Publications in High Energy Physics for Database SPIRES HEP
We introduce an approach to automatic indexing of e-prints based on a
pattern-matching technique making extensive use of an Associative Patterns
Dictionary (APD), developed by us. Entries in the APD consist of natural
language phrases with the same semantic interpretation as a set of keywords
from a controlled vocabulary. The method also allows to recognize within
e-prints formulae written in TeX notations that might also appear as keywords.
We present an automatic indexing system, AUTEX, which we have applied to
keyword index e-prints in selected areas in high energy physics (HEP) making
use of the DESY-HEPI thesaurus as a controlled vocabulary.Comment: 23 pages, 4 figure
Mass Shift of Axion in Magnetic Field
A mass-shift of the axion propagating in an external constant homogenious
magnetic field is calculated. The contributions via an electron loop and a
virtual photon are examined. It is shown that the virtual photon contribution
dominates substantially over the electron-loop one. Under the conditions of the
early Universe the electron-loop contribution to the massless axion mass-shift
is equal to zero while the virtual photon contribution is finite and can be of
order of the recent restrictions on the axion mass.Comment: 4 pages, latex2e, 2 PS figures, uses ws-p8-50x6-00.sty (included) and
amssymb.sty. Talk at the International Workshop on Particle Physics and the
Early Universe (COSMO-99), Trieste, Italy, 27 September - 3 October 199
Electromagnetic Catalysis of a Neutrino Radiative decay or One More Source of Information on the Lepton Mixing Angles?
The radiative decay of ultrarelativistic massive neutrino is investigated in electromagnetic fields in the framework of the
Standard Model with lepton mixing. Estimates of the decay probability and
``decay cross-section'' for accelerator neutrinos of high energies in the
electric field of nucleus permit one to discuss the general possibility of
carrying out the neutrino experiment. Such an experiment could give unique
information on mixing angles in the lepton sector of the Standard Model which
would be almost independent of the specific neutrino masses.Comment: 6 pages, LaTeX, Talk given by L.A.Vassilevskaya at the XXXth
Rencontres de Moriond, Electroweak Interactions and Unified Theories, Les
Arcs, Savoie, France, March 11-18, 199
A Note on the Cosmic Evolution of the Axion in a Strong Magnetic Field
It has been pointed out in the literature that in the presence of an external
magnetic field the axion mass receives an electromagnetic contribution. We show
that if a magnetic field with energy density larger than ~10^{-8} times the
energy density of the Universe existed at temperatures of a few GeV, that
contribution would be dominant and consequently the cosmic evolution of the
axion field would change substantially. In particular, the expected axion relic
abundance would be lowered, allowing a small relaxation of the present
cosmological bound on the Peccei-Quinn constant.Comment: 2 pages, no figures. Minor changes. References added. Accepted for
publication in JCA
Rare Electroweak Processes and and Heavy Top Quark
A brief overview of the recent measurements of the branching ratio of the
rare decay in the context of their agreement with the
Standard Model (SM) is given. It is shown that KEK result well correlates with
the SM and B-physics, whereas the BNL results are in conflict with the SM with
the heavy top quark.Comment: (talk given at the 5th Conference on the Intersections of Particle
and Nuclear Physics, St. Petersburg, Florida, USA, May 31-June 6, 1994), 6
pages, LaTeX, Yaroslavl, Yaroslavl State University preprint YARU-HE-94/0