On the ridge-like structures in the nuclear and hadronic reactions

Abstract

We briefly comment on the ridge-like structure origin in the nuclear and hadronic reactions emphasizing that this structure in the two-particle correlation function can result from the rotation of the transient state of matter.

ELLIPTIC FLOW IN pp-COLLISIONS AT THE LHC

“…At such high energies (LHC) the presence of reflective scattering mode serves as a trigger for the mainly peripheral nature of the inelastic interactions and the presence of large orbital angular momenta. Since correlations are maximal in the rotation plane, a narrow ridge should be observed in the two-particle correlation function [3].…”

“…In this note we discuss the elliptic flow in proton collisions on the base of approach [2] which was applied for discussion of the directed flow and the ridge in proton collisions [3]. This particular approach is based on the non-perturbative hadron dynamics.…”

On Correlations in High-Energy Hadronic Processes and the CMS Ridge: A Manifestation of Quantum Entanglement?

“…The appearance of long-range correlations in nuclear collisions at RHIC [24] and (very recently) in pp-collisions at the LHC [1] has been studied within the color-glass-condensate approach in [6,7] (see also the more recent papers [8,9]). In our study we refrain from making any assumptions about the structure of the quark-gluon (QG) matter just-before/during/just-after the proton-proton collisions, and appeal instead to a field theoretic description of the particle tracks in terms of path-dependent exponentials along the lines exposed above.…”

“…Theoretical attempts to dig out the physical origin of the ridge structure in the highmultiplicity pp data observed by CMS mainly concentrate on the properties of a particular state of matter-the Color Glass Condensate (CGC)-that was created during the high-energy collision (see, for instance, Refs. [7][8][9]). Other authors claim that the observed ridge may be the manifestation of an azimuthal quadrupole [11], or the result of reflective scattering effects in multiparticle production processes [10].…”

CMS ridge effect at LHC as a manifestation of bremstralung of gluons due to the quark-anti-quark string formation

“…(14) Neutral particles have to be also taken into account. In view to estimate the total multiplicity we multiply expression ( 14) by 3 2 (isotopic spin of a gluon is zero). Then we estimate √ s = 2∆EM p + M 2 p and corresponding mean multiplicity u :…”