The origin of thermal component in the transverse momentum spectra in high energy hadronic processes

被引：18

作者：

Bylinkin, Alexander A. ^{[1
,2
]}

Kharzeev, Dmitri E. ^{[3
,4
]}

机构：

[1] Inst Theoret & Expt Phys, Moscow 117218, Russia

[2] Moscow Inst Phys & Technol, Dolgoprudnyi 141700, Moscow Region, Russia

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

[4] Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA

来源：

INTERNATIONAL JOURNAL OF MODERN PHYSICS E | 2014年 / 23卷 / 12期

关键词：

Multiparticle production; hadron collisions; Unruh effect; CHARGED-PARTICLES; COLLISIONS; DISTRIBUTIONS;

D O I：

10.1142/S0218301314500839

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

The transverse momentum spectra of hadrons produced in high energy collisions can be decomposed into two components: the exponential ("thermal") and the power ("hard") ones. Recently, the H1 Collaboration has discovered that the relative strength of these two components in Deep Inelastic Scattering (DIS) depends drastically upon the global structure of the event - namely, the exponential component is absent in the diffractive events characterized by a rapidity gap. We discuss the possible origin of this effect and speculate that it is linked to confinement. Specifically, we argue that the thermal component is due to the effective event horizon introduced by the confining string, in analogy to the Hawking-Unruh effect. In diffractive events, the t-channel exchange is color-singlet and there is no fragmenting string - so the thermal component is absent. The slope of the soft component of the hadron spectrum in this picture is determined by the saturation momentum that drives the deceleration in the color field, and thus the Hawking-Unruh temperature. We analyze the data on nondiffractive pp collisions and find that the slope of the thermal component of the hadron spectrum is indeed proportional to the saturation momentum.

引用

页数：7

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