Vladimir Skokov

Vacuum fluctuations and the thermodynamics of chiral models

We consider the thermodynamics of chiral models in the mean-field approximation and discuss the relevance of the (frequently omitted) fermion vacuum loop. Within the chiral quark-meson model and its Polyakov loop extended version, we show that the fermion vacuum fluctuations can change the order of the phase transition in the chiral limit and strongly influence physical observables. We compute the temperature-dependent effective potential and baryon-number susceptibilities in these models, with and without the vacuum term, and explore the cutoff and the pion mass dependence of the susceptibilities. Finally, in the renormalized model the divergent vacuum contribution is removed using dimensional regularization.

Azimuthal asymmetries and the emergence of “collectivity” from multi-particle correlations in high-energy pA collisions

Abstract We show how angular asymmetries ∼ cos u2061 2 ϕ can arise in dipole scattering at high energies. We illustrate the effects due to anisotropic fluctuations of the saturation momentum of the target with a finite correlation length in the transverse impact parameter plane, i.e. from a domain-like structure. We compute the two-particle azimuthal cumulant in this model including both one-particle factorizable as well as genuine two-particle non-factorizable contributions to the two-particle cross section. We also compute the full BBGKY hierarchy for the four-particle azimuthal cumulant and find that only the fully factorizable contribution to c 2 { 4 } is negative while all contributions from genuine two, three and four-particle correlations are positive. Our results may provide some qualitative insight into the origin of azimuthal asymmetries in p + Pb collisions at the LHC which reveal a change of sign of c 2 { 4 } in high-multiplicity events.

High order cumulants of the azimuthal anisotropy in the dilute-dense limit: Connected graphs

We analytically compute higher order cumulants of the azimuthal anisotropy,

The rapidity dependence of the average transverse momentum in p + Pb collisions at the LHC: The Color Glass Condensate versus hydrodynamics

{c}_{2}{2m}

Multi-particle eccentricities in collisions dominated by fluctuations

, and corresponding

Collisional energy loss above the critical temperature in QCD

{v}_{2}{2m}

Average transverse momentum of hadrons in proton–nucleus collisions in the wounded nucleon model

at high transverse momentum in the dilute-dense limit. The dense target is considered in the framework of the McLerran-Venugopolan model. The absolute values of the harmonics

Pair production from space- and time-dependent strong fields

{v}_{2}{2m}

Net baryon number probability distribution near the chiral phase transition

of the azimuthal anisotropy are approximately equal,

Pair production at the edge of the QED flux tube

|{v}_{2}{2m}|ensuremath{approx}|{v}_{2}{2{m}^{ensuremath{}}}|