Quarkonia and quark drip lines in a quark-gluon plasma

Abstract

We extract the Q-Q potential by using the thermodynamic quantities obtained in lattice gauge calculations. The potential is tested and found to give spontaneous dissociation temperatures that agree well with those from lattice gauge spectral function analysis. Using such a Q-Q potential, we examine the quarkonium states in a quark-gluon plasma and determine the 'quark drip lines' which separate the region of bound color-singlet QQ states from the unbound region. The characteristics of the quark drip lines severely limit the region of possible bound QQ states with light quarks to temperatures close to the phase transition temperature. Bound quarkonia with light quarks may exist very near the phase transition temperature if their effective quark mass is of the order of 300-400 MeV and higher.

The search for a ridge structure origin with shower broadening and jet quenching

“…There are several proposals on the origin of the ridge structure [2,3,4,5]. Here we concentrate on the momentum broadening from glasma [4,5].…”

Momentum kick model description of the near-side ridge and jet quenching

“…Similar ∆φ-∆η correlations associated with a near-side jet have also been observed by the PHENIX Collaboration [16,17] and the PHOBOS Collaboration [18]. While many theoretical models [19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35] have been proposed to discuss the jet structure and related phenomena, the ridge phenomenon has not yet been fully understood.…”

“…Previously, a momentum kick model was put forth to explain the ridge phenomenon [19,20,21]. The model assumes that a near-side jet occurs near the surface, kicks medium partons, loses energy along its way, and fragments into the trigger and its associated fragmentation products (the "jet component") ( Fig.…”

Phenomenological analysis of angular correlations in 7 TeV proton-proton collisions from the CMS experiment

“…The initial stage fluctuations are described as color-glass condensate (CGC) [13] flux tubes (glasma) [12], localized "hot spots" in a quark-gluon plasma [19,41,42], or beamjet remnants from hard scattering processes [14,15]. The second class of models assumes hard, transverse parton − soft, longitudinal parton interactions via recombination [16] or strong rescattering [17] to induce the η ∆ -elongated correlations.…”

“…Hwa et al [16] proposed that the same-side ridge is generated by fast parton (from semi-hard scattering) -soft, "thermal" parton recombination into final-state hadrons. Wong [17] explained the same-side ridge by way of scattering (momentum kick) between fast, transverse scattered partons and soft partons of a medium. Levin and Rezaeian [18] argued that the long-range rapidity and azimuth correlations between charged hadron pairs produced from two BFKL parton showers will contribute to the CMS ridge.…”