arXiv subjects

A. M. Snigirev

Publications and source records attributed to A. M. Snigirev.

76 records · Page 5Linked to original sources

arXiv1998

Phonon-Like Excitations of the Instanton Liquid

The phonon-like excitations of (anti)-instanton liquid ($\bar II$) due to adiabatic variations of vacuum wave functions are studied in this paper. The kinetic energy term is found and proper effective Lagrangian for such excitations is evaluated.The properties of their spectrum, while the corresponding masses are defined by $Λ_{QCD}$ with prevailing chromoelectric component, are investigated based on the phenomenology of QCD vacuum already developed.

hep-ph↗

arXiv1998

Angular structure of energy losses of hard jet in dense QCD-matter

Angular structure of radiative and collisional energy losses of a hard parton jet propagating through dense QCD-matter is investigated. For small angular jet cone sizes, $θ_0 < 5^0$, the radiative energy loss is shown to dominate over the collisional energy loss due to final state elastic rescattering of the hard projectile on thermal particles in the medium. Due to coherent effects, the radiative energy loss decreases with increasing the angular size the jet. It becomes comparable with the collisional energy loss for $θ_0 > 5^0-10^0$.

hep-ph↗

arXiv1998

Simple Mechanism of Softening Structure Functions at Low Transverse Momentum Region

The relevance of the dipole configurations of quarks in forming nucleus structure functions is discussed. It is shown that a radiation generated by dipole configurations while moving relativistically along their axises is described by distributions which are finite and infrared stable in low transverse momentum region. It is argued that there is an exponential transition to the perturbative regime of large transverse momenta and its power is defined by the distance between the dipole charges in its rest frame $m^{-1}_π$.

hep-ph↗

arXiv1997

Radiative energy loss of hard parton jet in expanding quark-gluon fluid

The gluon radiation induced by multiple scattering of a hard parton in expanding quark-gluon plasma is investigated. The radiative energy loss of hard parton jet is shown to decrease considerably when angular size of extracted jet goes up, but the fraction of loss survives even for the reasonable wide cone of angles due to the coherent effects taking into account the rescattering of the radiated gluons in the QCD medium. The possible application to the jet quenching phenomenon in heavy ion collisions at LHC energies is discussed.

hep-ph↗