高能软相互作用研究：CGC/饱和方法与包容性生产的新视角

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"高能量软相互作用的CGC /饱和方法：包容性生产" 这篇资源是发表在《Physics Letters B》期刊上的学术文章，探讨了在高能量量子色动力学（QCD）环境下，如何利用Color Glass Condensate (CGC) 和饱和方法来描述软相互作用中的包容性生产过程。CGC理论是一种处理高密度色荷系统的方法，它在高能物理中用于理解强相互作用，尤其是在重离子碰撞中的现象。文章提到了“偶极子模型”，这是一个在QCD中用于描述强子内部结构的简化模型，其中强子被视为由一个正电荷和一个负电荷组成的偶极子。作者表明，他们的偶极子模型能够在与衍射物理学相同的理论框架下有效地解释包容性生产的观测结果。衍射物理学是研究粒子在散射过程中如何部分或完全保留其原始特性的领域，这通常涉及一种称为Pomeron的交换粒子。 CGC/saturation方法结合了Reggeon理论和CGC的有效理论。Reggeon理论是高能散射理论的一部分，它描述了能量与散射截面之间的非线性增长，而CGC则引入了饱和的概念，即在极高能量下，色荷密度变得如此之大，以至于进一步增加的能量并不能显著增加散射截面。这种饱和效应是理解高能散射中的某些关键现象的关键。文章进一步指出，包容性生产（inclusive production）指的是在高能碰撞中，不考虑特定末态粒子的情况下，所有可能的产物都被考虑在内。在高能量软相互作用中，包容性生产可以提供关于强相互作用过程的全局信息。关键词包括：软Pomerons、CGC/saturation方法、BFKL Pomeron和高能下的包容性生产。BFKL Pomeron是另一种描述高能散射中渐近增长的理论，与Reggeon理论密切相关，但更注重QCD的渐近自由度。这篇文章提供了对高能QCD中软相互作用的新见解，通过CGC/saturation方法和偶极子模型，研究者能够更好地理解包容性生产过程，并将这些理论工具应用于衍射物理的框架。这不仅加深了对强相互作用的理解，也为未来实验设计和数据分析提供了理论基础。

Physics Letters B 746 (2015) 154–158

Contents lists available at ScienceDirect

Physics Letters B

www.elsevier.com/locate/physletb

CGC/saturation approach for soft interactions at high energy: Inclusive

production

E. Gotsman

a,∗

, E. Levin

a,b

, U. Maor

Department of Particle Physics, School of Physics and Astronomy, Raymond and Beverly Sackler Faculty of Exact Science, Tel Aviv University, Tel Aviv, 69978,

Israel

Departemento de Física, Universidad Técnica Federico Santa María, and Centro Cientíﬁco-Tecnológico de Valparaíso, Avda. Espana 1680, Casilla 110-V,

Valparaíso, Chile

a r t i c l e i n f o a b s t r a c t

Article history:

Received

24 March 2015

Received

in revised form 20 April 2015

Accepted

30 April 2015

Available

online 5 May 2015

Editor:

A. Ringwald

Keywords:

Soft

Pmeron

CGC/saturation

approach

BFKL

Pomeron

Inclusive

production at high energies

In this letter we demonstrate that our dipole model is successful in describing inclusive production within

the same framework as diffractive physics. We believe that this achievement stems from the fact that our

approach incorporates the positive features of the Reggeon approach and CGC/saturation effective theory,

for high energy QCD.

(http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP

1. Introduction

The LHC data on inclusive production [1–3] call for a theoretical

understanding of these processes within the framework of QCD.

At ﬁrst sight it would appear, that this process is a typical soft

process, which occurs at long distances, where one should use the

methods of non-perturbative QCD. Since such methods are only

in an embryonic stage, soft processes at high energy remain in

the arena of high energy phenomenology, based on the concept

of a soft Pomeron. Adopting this approach, inclusive production

can be calculated using the technique of Mueller diagrams [4]. It

has been demonstrated that soft Pomeron based models provide

a reasonable description of the data [5,6]. The advantage of our

approach is the feasibility of describing inclusive production on the

same footing as diffractive production, and elastic scattering.

the other hand, in the CGC/saturation approach for inclusive

production [7–13], one has a different scenario. In this approach

the inclusive production occurs in two stages. The ﬁrst stage is

the production of a mini-jet with the typical transverse momen-

tum

, where Q

is the saturation scale, which is much larger

than the soft scale. This process is under full theoretical control.

Corresponding author. Tel.: +972 3 6408671; fax: +972 3 6407932.

E-mail

addresses: gotsman@post.tau.ac.il (E. Gotsman), leving@post.tau.ac.il,

eugeny.levin@usm.cl (E. Levin), maor@post.tau.ac.il (U. Maor).

The second stage is the decay of the mini-jet into hadrons, which

has to be treated phenomenologically, using data from the hard

processes. Such an approach leads to a good description of the ex-

perimental

data on inclusive production, both for hadron–hadron,

hadron–nucleus and nucleus–nucleus collisions, and observation of

regularities in the data, such as geometric scaling [14–18]. The

shortcoming of this approach is the fact that it is detached from

diffractive physics.

should be mentioned, that the recently published measure-

ments

of the pseudorapidity distributions of charged particles in

proton–proton collisions at an energy of 8TeVprovide an addi-

tional

challenge for model builders, which has not yet been suc-

cessfully

answered [2].

this letter, we continue (see Refs. [19,20]) to construct a

model for high energy soft interactions, which incorporates the ad-

vantages

of both approaches. This model is based on the Colour

Glass Condensate (CGC)/saturation effective theory (see Ref. [21]

for

the review), and on the perturbative BFKL Pomeron [22]. We

assume that the unknown mechanism for the conﬁnement of

quarks and gluons in QCD, is not important, and its inﬂuence

can be reduced to the determination of several parameters related

to the CGC/saturation approach, which depend on long distance

physics.

The

main attributes of the model have been discussed in Refs.

[19,20], in this paper we will only include information that we

require for the discussion of inclusive production.

http://dx.doi.org/10.1016/j.physletb.2015.04.069

0370-2693/

SCOAP

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