New regimes of the stringy (holographic) Pomeron and high-multiplicity pp and pA collisions

被引：28

作者：

Shuryak, Edward ^{[1
]}

Zahed, Ismail ^{[1
]}

机构：

[1] SUNY Stony Brook, Dept Phys & Astron, Stony Brook, NY 11794 USA

来源：

PHYSICAL REVIEW D | 2014年 / 89卷 / 09期

关键词：

CROSS-SECTIONS; ANGULAR-CORRELATIONS; LONG-RANGE; LARGE N; ENERGY; SCATTERING; EXCHANGE; FIELD; SIDE;

D O I：

10.1103/PhysRevD.89.094001

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Holographic AdS/QCD models of the Pomeron unite a string-based description of hadronic reactions of the pre-QCD era with the perturbative BFKL approach. The specific version we will use due to Stoffers and Zahed [1-5], is based on a semiclassical quantization of a "tube" (closed string exchange or open string virtual pair production) in its Euclidean formulation using the scalar Polyakov action. This model has a number of phenomenologically successful results. The periodicity of a coordinate around the tube allows the introduction of a Matsubara time and therefore an effective temperature Teff on the string. We observe that at the LHC energies and for sufficiently small impact parameter, Teff approaches and even exceeds the Hagedorn temperature of the QCD strings. Based on studies of the stringy thermodynamics of pure gauge theories we suggest that there should exist two new regimes of the Pomeron: the "near-critical" and the "postcritical" ones. In the former one, string excitations create a high-entropy "string ball," with high energy and entropy but small pressure and free energy. If heavy enough, this ball becomes a ( dual) black hole. As the intrinsic temperature of the string exceeds the Hagedorn temperature, the ball becomes a postcritical explosive "QGP ball." The hydrodynamical explosion resulting from this scenario was predicted [6] to have radial flow exceeding any ever seen, even in heavy ion collisions, which was recently confirmed by CMS and ALICE at LHC. We also discuss the elastic scattering profile, finding some hints for new phases in it, as well as two-particle correlations.

引用

页数：22

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