118525796
Transport properties of a charged drop in an external electric field
Transport properties of a small, dense, charged droplet in external field are discussed. A time dependent non-equilibrium distribution function of the transverse, azimuthally symmetric droplet in the external electric field is calculated. With the help of this distribution function, a shear viscosity coefficient in the transverse plane is calculated as well and it is found to be depend on the time of the droplet’s expansion and is very small. An applicability of the results to the description of initial states of quark-gluon plasma obtained in high-energy interactions of nuclei is also discussed. Email: sergeyb@ariel.ac.il Email: komosh@ariel.ac.il
118992904
An Inclusive Cross Section for the Nucleus - Nucleus Interaction at RHIC Energies
We discuss the saturation of the parton density in heavy ion collisions at RHIC energiesusing a Pomeron approach. Our predictions for the particle density in ion-ion collisions at RHIC energies can be utilized as the background for the observation of possible quark-gluon plasma production.
126281887
Matching of soft and hard Pomerons
10666222
Langevin equation in effective theory of interacting QCD pomerons in the limit of large Nc
Abstract Effective field theory of interacting BFKL pomerons is investigated and Langevin equation for the theory, which arises after the introduction of additional auxiliary field, is obtained. The Langevin equations are considered for the case of interacting BFKL pomerons with both splitting and merging vertexes and for the interaction which includes additional “toy” four pomeron interaction vertex. In the latest case an analogy with the Regge field theory in zero dimensions (RFT-0) was used in order to obtain this “toy” vertex, which coincided with the four point function of two-dimensional conformal field theory obtained in [G.P. Korchemsky, Nucl. Phys. B 550 (1999) 397]. The comparison between the Langevin equations obtained in the frameworks of dipole and RFT approaches is performed, the interpretation of results is given and possible application of obtained equations is discussed.
16896635
Gluon density and F2 functions from BK equation with impact parameter dependence
Abstract The LO BK equation for unintegrated gluon density with impact parameter dependence is considered. The form of initial condition for the equation is determined, which is similar to the form of fenomenological GBW ansatz. The gluon density function and F 2 function are calculated and compared with the results for the gluon density and F 2 functions from the GRV parameterization for different values of Q 2 . It is shown, that the results for F 2 structure function of the considered model are in the good accordance with the results obtained from the GRV parameterization of parton densities. Therefore, obtained initial conditions for unintegrated gluon density could be used for the calculation of proton–proton scattering process as well, [S. Bondarenko, L. Motyka, in preparation].
119453424
Proton–proton interaction in constituent quarks model at LHC energies
In this paper we consider soft processes at LHC energies in the framework of the constituent quark model. We show that this rather naive model is able to describe all available soft process data at lower energies and to predict the behavior of the total cross section, the elastic and diffractive cross sections at LHC energy. It turns out that the “input” pomeron that has been used in this approach has parameters that are close to the so called “hard” pomeron with rather large intercept Δ≈0.12 and small value of the slope α′P≈0.08 GeV-2. We show that the elastic amplitude has a minimum at impact parameter b=0 and a maximum at b≈2 GeV-1. Such a behavior is the result of overlapping of the parton clouds that belong to the different quarks in the hadron.
119480152
SANCscope -- v.1.00
In this article we have summarized the status of the system SANC version 1.00. We have implemented theoretical predictions for many high energy interactions of fundamental particles at the one-loop precision level for up to 4-particle processes. In the present part of our SANC description we place emphasis on an extensive discussion of an important first step of calculations of the one-loop amplitudes of 3- and 4-particle processes in QED, QCD and EW theories. SANC version v1.00 is accessible from servers at Dubna http://sanc.jinr.ru/ (159.93.74.10) and CERN http://pcphsanc.cern.ch/ (137.138.180.42)