2,377 research outputs found
Integral and derivative dispersion relations in the analysis of the data on and forward scattering
Integral and derivative dispersion relations (DR) are considered for the
and forward scattering amplitudes. A new representation for the
derivative DR, valid at lower energies than the standard one, is obtained. The
data on the total cross sections of interaction as well as those
on the ratio of the real part to the imaginary part of the forward amplitude
are analyzed within various forms of the DR and high-energy Regge models. It is
shown that three models for the pomeron, simple pole with intercept larger than
one, triple pole pomeron and double pole pomeron (both with intercept equal to
one) lead to practically equivalent descriptions of the data at
GeV. It is also shown that the low-energy part of the dispersion integral (from
the two-proton threshold up to GeV) allows one to reproduce well
the data on at lower energies without additional free parametersComment: 9 pages (LaTeX) including 4 figures. To be published in Proceedings
of the International Conference "New trends in high-energy physics" in
Alushta, Ukraine, May 24-31, 200
Integral and derivative dispersion relations, analysis of the forward scattering data
Integral and derivative dispersion relations (DR) are considered for the
forward scattering and amplitudes. A new representation for the
derivative DR, valid not only at high energy, is obtained. The data on the
total cross sections for interaction as well as the data on the
parameter are analyzed within the various forms of the DR and
high-energy Regge models. It is shown that three models for the Pomeron, Simple
pole Pomeron, Tripole Pomeron and Dipole Pomeron (the both with the intercept
equal unit) lead to practically equivalent description of the data at
5 GeV. It is also shown that the correctly calculated low-energy
part of the dispersion integral (from the two-proton threshold up to
5 GeV) allows to reproduce well the data at low energies
without additional free parameters.Comment: LaTeX, 3 pages, 2 eps figures, talk presented by E. Martynov at the
International Europhysics Conference on High Energy Physics (HEP 2003), 17-23
July 2003, Aachen, German
Chiral color symmetry and possible -boson effects at the Tevatron and LHC
A gauge model with chiral color symmetry is considered and possible effects
of the color -boson octet predicted by this symmetry are investigated in
dependence on two free parameters, the mixing angle and mass
. The allowed region in the plane is found from the
Tevatron data on the cross section and forward-backward
asymmetry of the production. The mass limits
for the -boson are shown to be stronger than those for the axigluon. A
possible effect of the -boson on the production at the LHC is
discussed and the mass limits providing for the -boson evidence at the LHC
are estimated in dependence on .Comment: 11 pages, 2 figures, accepted for publication in Modern Physics
Letters
The soft and the hard pomerons: elastic scattering and unitarisation
The hard pomeron component needed to reproduce small-x data seems to be
present in elastic scattering at moderate energy. If this is the case, it is
likely that the total cross section at the LHC will be appreciably larger than
previously expected.Comment: Talk given at 12th International Conference on Elastic and
Diffractive Scattering: Forward Physics and QCD, Hamburg, DESY, Germany,
21-25 May 200
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