N. A. Khokhlov

Relativistic optical model on the basis of the Moscow potential and lower phase shifts for nucleon-nucleon scattering at laboratory energies of up to 3 GeV

Data of a partial-wave analysis of nucleon-nucleon scattering at energies of up to Elab = 3 GeV (lower partial waves) and the properties of the deuteron are described within the relativistic optical model based on deep attractive quasipotentials involving forbidden states (as exemplified by the Moscow potential). Partial-wave potentials are derived by the inverse-scattering-problem method based on the Marchenko equation by using present-day data from the partial-wave analysis of nucleon-nucleon scattering at energies of up to 3 GeV. Channel coupling is taken into account. The imaginary parts of the potentials are deduced from the phase equation of the variable-phase approach. The general situation around the manifestation of quark effects in nucleon-nucleon interaction is discussed.

Reconstruction of the optical potential from scattering data

We propose a method for reconstructing the optical potential (OP) from scattering data. The algorithm is a two-step, procedure. In the first step, the real part of the potential is determined analytically via solution of the Marchenko equation. At this point, we use a rational function fit of the corresponding unitary S matrix. In the second step, the imaginary part of the potential is determined via the phase equation of the variable phase approach. We assume that the real and imaginary parts of the OP are proportional (the Lax-type interaction). We use the phase equation to calculate the proportionality coefficient. A numerical algorithm is developed for a single and for coupled partial waves. The developed procedure is applied to analyze the {sup 1}S{sub 0}NN,{sup 3}SD{sub 1}NN, and P31 {pi}{sup -}N data. For the NN states, we constructed partial potentials with forbidden states (Moscow potential). We examine the {pi}{sup -}N and NN partial-wave analysis data and demonstrate that the Lax-type interaction may be valid for these systems at the considered energies.

Nucleon-nucleon wave function with short-range nodes and high-energy deuteron photodisintegration

We review a concept of the Moscow potential of the

Off-shell test of the Moscow potential of nucleon-nucleon interaction on the basis of data on the reaction γd → np in the photon-energy region around Eγ ≃ 2 GeV, where this reaction is sensitive to quark effects

\mathit{NN}

Exclusive electrodisintegration of the deuteron within the point form of relativistic quantum mechanics

interaction. On the basis of this concept, we derive by quantum inversion optical partial potentials from the modern partial-wave analysis data and deuteron properties. Point-form relativistic quantum mechanics is applied to the two-body deuteron photodisintegration. Calculations of the cross-section angular distributions cover photon energies between 1.1 and 2.5 GeV. Good agreement between our theory and recent experimental data confirms the concept of deep attractive Moscow potential with forbidden

Relativistic treatment of the hard-bremsstrahlung process pp → ppγ and possibility of discriminating between different types of nucleon-nucleon interaction

S

Possibility of choosing between different types of nucleon-nucleon interaction on the basis of data on hard bremsstrahlung in the process pp → ppγ at beam energies in the range 350–500 MeV

and

Nucleon-nucleon short range wave function and hard bremsstrahlung p p ---> p p gamma

P

Description of the tensor analyzing powers of the deuteron-photodisintegration reaction γd → np

states.

Description of polarization data for deuteron photodisintegration at photon energies in the range Eγ = 1.5–2.5 GeV on the basis of the Moscow potential of NN interaction

Various pieces of evidence in favor of the Moscow potential of nucleon-nucleon interaction are discussed. The formalism of a relativistic potential model as applied to deuteron photodintegration is expounded. The differential cross section calculated for the reaction γd → np on the basis of the Moscow potential at incident-photon energies Eγ between 1.5 and 2.5 GeV are quite in accord with present-day experimental data, which are also described well in the literature on the basis of the model of quark-gluon strings. Further steps in testing the Moscow potential and microscopically substantiating it on the basis of quark models are indicated.