4,735 research outputs found
Saturation and Critical Phenomena in DIS
It is argued that the expected turn-down in of the cross sections
(structure functions ), assumed to result from the saturation of
parton densities in the nucleon, is related to a phase transition from the
(almost) ideal partonic gas, obeying Bjorken scaling, to a partonic "liquid".
This can be quantified in the framework of statistical models, percolation and
other approaches to collective phenomena of the strongly interacting matter.
Similarities and differences between the case of lepton-hadron, hadron-hadron
and nuclear collisions are discussed.Comment: 7 pages, 2 figures, talk given by L.L. Jenkovszky at the EDS'09
Conferenc
Multiparticle production in the model with antishadowing
We discuss the role of absorbtion and antishadowing in particle production.
We reproduce power-like energy behavior of the mean multiplicity in the model
with antishadowing and discuss physical implications of such behavior for the
hadron structure.Comment: 11 pages, 3 figures, extended version of the talk at the XXXII
International Symposium on Multiparticle Dynamics September 7-13, 2002
Alushta, Crimea, Ukrain
Selection of highly productive grape variations using methods of multidimensional analysis
A method of clonal grape selection that allows the identification of genotypes with high productivity, based on phenotypes, with a substantial decrease in the duration of the process of selection is proposed. Multi-stage selection of the best plants is carried out in the same stock nursery during 4-5 years. 5-6% of the selected plants include mutated and modified variations characterized not only by high productivity, normal vigor, good quality of fruit and good sanitary condition of vines, but also by a stable expression of these desirable characters
On impact parameter dependence of low-x structure functions
We consider impact parameter dependence of the polarized and unpolarized
structure functions. Unitarity does not allow factorization of the 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: 5 pages, 1 figur
A study of leaf and callus antigens in Euro-Asian and American grapevines
Immunochemical reactions of absorbed antisera with leaf and callus antigens of American and European grapevine species revealed species-specific antigens. Immunochemical reactions of extracts from grape leaves and callus were identical. The presence of species-specific antigens in the undifferentiated callus indicated that they are not linked to cell specialization. Leaf and callus antigens with molecular weights of approximately 100 kDa are specific for V. vinifera L. Antigens with molecular weights of more than 200 kDa are specific for American species of grapevine
Different behaviour of the spin structure functions and at
We consider low- behaviour of the spin structure functions and
in the unitarized chiral quark model which combines ideas on the
constituent quark structure of hadrons with a geometrical scattering picture
and unitarity. A nondiffractive singular low- dependence of and
indicated by the recent SMC experimental data is described. A
diffractive type smooth behaviour of is predicted at small . The
expectations for the double-spin asymmetries in the low-mass Drell-Yan
production at RHIC in the central region are discussed alongside.Comment: LaTeX, 10 pages, 2 figure
Mechanism of single-spin asymmetries generation in the inclusive hadron processes
We discuss a nonperturbative mechanism for generation of the single-spin
asymmetries in hadron interactions. It is based on the chiral quark model
combined with unitarity and impact parameter picture and provides explanation
for the experimental regularities observed under the measurements of the spin
asymmetries.Comment: 20 pages, 7 figure
Hyperon Polarization in the Constituent Quark Model
We consider mechanism for hyperon polarization in inclusive production. The
main role belongs to the orbital angular momentum and polarization of the
strange quark-antiquark pairs in the internal structure of the constituent
quarks. We consider a nucleon as a core consisting of the constituent quarks
embedded into quark condensate. The nonperturbative hadron structure is based
on the results of chiral quark models.Comment: 14 pages, LaTeX, 2 Figures, References adde
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