Collective String Interactions in AdS/QCD and High-Multiplicity pA Collisions

Abstract

QCD strings originate from high-energy scattering in the form of Reggeons and Pomerons, and have been studied in some detail in lattice numerical simulations. Production of multiple strings, with their subsequent breaking, is now a mainstream model of high energy $pp$ and $pA$ collisions. Recent LHC experiments revealed that high multiplicity end of such collisions show interesting collective effects. This ignited an interest in the interaction of QCD strings and multi-string dynamics. Holographic models, collectively known as AdS/QCD, developed in the last decade, describe both hadronic spectroscopy and basic thermodynamics, but so far no studies of the QCD strings have been done in this context. The subject of this paper is to do this. First, we study in more detail the scalar sector of hadronic spectroscopy, identifying "glueballs" and "scalar mesons," and calculate the degree of their mixing. The QCD strings, holographic images of the fundamental strings, thus have a "gluonic core" and a "sigma cloud." The latter generates $\sigma$ exchanges and collectivization of the strings, affecting, at a certain density, the chiral condensate and even the minimum of the effective string potential, responsible for the very existence of the QCD strings. Finally, we run dynamical simulations of the multi-string systems, in the "spaghetti" setting approximating central $pA$ collisions, and specify conditions for their collectivization into a black hole, or the dual QGP fireball.

14 pages, 10 figures

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Cited by in corpus (10)

• Heavy Ion Collisions: Achievements and Challenges
• Holographic modeling of nuclear matter and neutron stars
• Nonchiral enhancement of scalar glueball decay in the Witten-Sakai-Sugimoto model
• Holographic Photon Production in Heavy Ion Collisions
• Holographic entropy and real-time dynamics of quarkonium dissociation in non-Abelian plasma
• Regge theory in a Holographic dual of QCD in the Veneziano Limit
• Regimes of the Pomeron and its Intrinsic Entropy
• Glue in hadrons at medium resolution and the QCD instanton vacuum
• Lectures on nonperturbative QCD ( Nonperturbative Topological Phenomena in QCD and Related Theories)
• Azimuthal flow in hadron collisions from quark-gluon string repulsion