Elliptical flows in Reggeon theory

A new mechanism for the generation of an azimuthal anisotropy of particles produced in heavy-ion collisions is analyzed. An analysis is performed within Reggeon theory and is general. The resulting effect can be interpreted in terms of the partonic structure of a fast nucleus. This mechanismcan contribute significantly to the observed value of the elliptic flow υ ₂. The dynamics in question differs significantly from a standard mechanism of the collective motion of a hadron medium after a collision.

     

On production of large transverse momentum hadrons on nuclei

It is shown that multipole pomeron cuts can lead to the inclusive cross-section dependence $\text{(}\text{ω}\text{d}{}^3\text{σ}\text{d}\text{p}{}^3\text{)A ～ A}{}^{\mathrm{\gamma (p\perp )}}$, $\text{γ(p⊥) ?}\text{4}\text{3}$ at large p⊥, due to the hard scattering of partons from different pomeron ladders.     

Anisotropic flows from initial state of a fast nucleus

We analyze azimuthal anisotropy in heavy-ion collisions related to the reaction plane in terms of the standard reggeon approach and find that it is non-zero even when the final-state interaction is switched off. This effect can be interpreted in terms of the partonic structure of the colliding nuclei. We use a Feynman diagram analysis to describe the details of this mechanism. The main qualitative features of the appropriate azimuthal correlations are discussed.     

Strong interactions at high energies in the Reggeon approach

A brief survey of the development of Reggeon theory at ITEP and its application to hadron interactions at high energies is given. Basic properties of Regge poles and moving branch points and their relation to multiparticle hadron production are discussed. The one-pion-exchange model for describing exclusive and inclusive processes is considered. Basic properties of the model of quark-gluon strings and its applications are described. Reggeon field theory, its various asymptotic regimes, and its relation to diffractive phenomena are examined. The important role of Pomeron interactions in the theory of the supercritical Pomeron and their manifestations in the theory of deep-inelastic electron scattering and in heavy-ion collisions are discussed.     

Aleksei Borisovich Kaidalov (July 20, 1940–July 25, 2010)

Physics of Atomic Nuclei -     

Gravitation interactions at high energies and Reggeon scheme

A parton-Reggeon model that, for basic partons, employs gravitons of virtuality on the order of the Planck scale is proposed to describe inelastic interactions at trans-Planckian energies. A graviton analog of the Pomeron with an intercept of α(0)=3 is introduced on the basis of the structure of the gravitational field of a fast particle. Its unitarization leads to inelastic cross sections growing in proportion to s and corresponds to the pattern of a collision between black disks of radius about E _i ^1/2 . The inclusive spectra of hard gravitions whose behavior is determined by the size of the region of overlap of colliding black disks at various impact parameters and various energies is found. The graviton system formed in this way proves to be unstable against the gravitational attraction of particles having close momenta. This leads to the emergence of a multiperipheral chain of black holes at the stage of divergence—the structure of such a chain depends greatly on the impact parameters of a collision.