382 research outputs found
Spin correlations due to antishadowing
The effects of antishadowing related to the spin correlations of particles in
multiparticle production are discussed. It is shown that significant spin
correlations should be expected at the LHC energies.Comment: 5 pages, 1 figure, minor change
Indication on the universal hadron substructure - constituent quarks
The universality of single-spin asymmetry on inclusive pi-meson production is
discussed. This universality can be related to the hadron substructure -
constituent quarks.Comment: 3 pages, 3 figures, references adde
The role of double helicity-flip amplitudes in small-angle elastic pp-scattering
We asses a role of the double helicity-flip amplitudes in small-angle elastic
pp-scattering and obtain a new unitary bound for the double helicity-flip
amplitude F_2 in elastic pp-scattering at small values of t on the basis of the
U-matrix method of the s-channel unitarization.Comment: 8 pages, minor correction
Preasymptotic nature of hadron scattering vs small-x HERA Data
We emphasize that recently observed regularities in hadron interactions and
deep-inelastic scattering are of preasymptotic nature and it is impossible to
make conclusions on the true asymptotic behavior of observables without
unitarization procedure. Unitarization is important and changes scattering
picture drastically.Comment: LaTeX file, 9 pages; 4 tarred, gzipped and uuencoded figures in a
separate fil
Impact parameter dependence of parton densities at low x
We consider impact parameter dependence of the polarized and unpolarized
parton densities. Unitarity does not allow factorization of these structure
functions over the Bjorken x and the impact parameter b variables. On the basis
of the particular geometrical model approach we conclude that spin of
constituent quark may have a significant orbital angular momentum component
which can manifest itself through the peripherality of the spin dependent
structure functions.Comment: 4 pages, to appear in the Proceedings of the Workshop Diffraction
2000, Cetraro, Italy, 2-7 September 200
On the extreme behaviour of at
On the basis of the U-matrix form of s-channel unitarization, we consider
constraints unitarity provides for the spin structure function at
. Corresponding constraint for the spin structure function is given along.Comment: 4 pages, latex, enlarged, to be published in Phys. Lett.
Strangeness in constituent quarks and one-spin asymmetry in inclusive -meson production
On the basis of the mechanism proposed earlier for one-spin asymmetries in
inclusive hadron production we consider OZI--suppressed process of
-meson production and asymmetry
in this process. The main role in generation of this asymmetry
belongs to the orbital angular momentum of strange quark-antiquark cloud in
internal structure of constituent quarks.Comment: 8 pages, plain LaTeX, no figure
Elastic and scattering at LHC
We discuss the possibility of measuring leading neutron production at the
LHC. These data could be used to extract from it and
cross-sections. In this note we give some estimates for the case of elastic
cross-sections and discuss related problems and prospects.Comment: 26 pages, 25 figures, to be published, minor text correction
Charge form factor of and mesons
The charge form factor of and mesons is evaluated adopting a
relativistic constituent quark model based on the light-front formalism. The
relevance of the high-momentum components of the meson wave function, for
values of the momentum transfer accessible to energies, is illustrated.
The predictions for the elastic form factor of and mesons are
compared with the results of different relativistic approaches, showing that
the measurements of the pion and kaon form factors planned at could
provide information for discriminating among various models of the meson
structure.Comment: 8 pages, latex, 4 figures available as separate .uu fil
- …