arXiv subjects

V. M. Kolybasov

Publications and source records attributed to V. M. Kolybasov.

4 recordsLinked to original sources

arXiv1999

True parameters of He-4-Sigma hypernucleus

It is shown that the true parameters of He-4-Sigma differ from the observed ones. The reason is that the amplitude of He-4-Sigma production in the reaction He-4(K-,pi-) sharply varies just in the corresponding mass region. It leads to the small, but noticeable shift of the binding energy and the width. Besides, the data at the threshold of Sigma-0 production is found to give an additional evidence that He-4-Sigma width cannot exceed 8.0 - 8.5 MeV.

nucl-th↗

arXiv1999

The program of research at hadronic beams of ITEP accelerator. (Collection of experimental proposals)

This is a collection of proposals of experiments at hadronic beams of 10 GeV accelerator, situated at the Institute of Theoretical and Experimental Physics (Moscow, Russia). The proposals were presented by the leaders of several ITEP experimental groups and include selected problems of hadron-hadron (exotic states, scalar mesons, electomagnetic form factors, polarization phenomena etc.) and hadron-nucleon interactions (flucton and nuclear matter properties, hadron properties inside nuclei, interactions at small distances). Most of proposals are united by an idea of a common magnetic spectrometer with LiH(D) and polarized targets, wich could be built on the base of an existing 3m magnet. Some of them also refer to the intrinsic accelerator beam and to the new ion ring.

hep-ex↗

arXiv1999

On the distinct observation of the moving triangle singularity

It is shown that nonzero orbital momentum in the vertex of secondary interaction in the triangle graph leads to a more clear picture corresponding to the moving complex singularity compared with the case of constant vertex. The peak in the distribution of the final particles invariant mass becomes narrower and its shift with momentum transfer more distinct. It opens the possibility to observe this picture experimentally.

nucl-th↗

arXiv1999

On the production mechanism of Sigma-hypernuclear systems in A(K-,pi+-) reactions

It is shown that the new data on the excitation energy Eex spectrum of the residual nuclear system in the Sigma-hypernuclear region in the reactions (K-,pi+-) on Be-9 and in the reaction (K-,pi+) on He-4 and C-12 can be described without the supposition on the existence of excited Sigma-hypernuclear states. The basis is formed by a simultaneous consideration of the quasi-free Sigma production and Sigma-nuclear rescattering (elastic and with Sigma -> Lambda conversion) with account of interference of the respective amplitudes. For final decision of the question about the nature of the irregularities in Eex spectrum, it is proposed to study the picture corresponding to the so-called moving complex singularity of the triangle graph with Sigma rescattering: the position and the width of the peak in Eex distribution must appreciably change with momentum transferred from the initial kaon to the final pion.

nucl-th↗