基于CGC/饱和度方法的高能QCD理论研究：次要基元和对能量的依赖

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"CGC /饱和度方法：次要基元和对能量的依赖" 本文讨论了基于CGC /饱和度方法的模型在描述软相互作用碰撞中的应用。CGC /饱和度方法是一种高能量QCD有效理论，通过incorporating次要基元（Secondary Reggeons），可以描述完整的软数据集，包括ρ的能量行为，即ρ的弹性散射幅度的实部与虚部之比。 CGC /饱和度方法的优势在于可以描述广泛的能量范围内的软数据，包括在13 TeV处的新TOTEM数据。此外，本方法还可以描述ρ的能量行为，包括ρ的弹性散射幅度的实部与虚部之比。这种方法的优点在于可以描述软相互作用碰撞的详细信息，包括能量依赖关系。在本文中，作者们证明了基于CGC /饱和度方法的模型可以成功地描述软相互作用碰撞，包括在13 TeV处的新TOTEM数据。同时，作者们还讨论了次要基元对能量的依赖关系，包括ρ的能量行为。 CGC /饱和度方法是一种高效的方法，能够描述软相互作用碰撞的详细信息，包括能量依赖关系。这种方法的应用前景广阔，能够推动高能量QCD研究的发展。知识点： 1. CGC /饱和度方法是一种高能量QCD有效理论，能够描述软相互作用碰撞的详细信息。 2. 次要基元（Secondary Reggeons）可以incorporated into CGC /饱和度方法，以描述完整的软数据集。 3. CGC /饱和度方法可以描述广泛的能量范围内的软数据，包括在13 TeV处的新TOTEM数据。 4. ρ的能量行为可以通过CGC /饱和度方法来描述，包括ρ的弹性散射幅度的实部与虚部之比。 5. CGC /饱和度方法能够描述软相互作用碰撞的详细信息，包括能量依赖关系。 CGC /饱和度方法是一种高效的方法，能够描述软相互作用碰撞的详细信息，包括能量依赖关系。这种方法的应用前景广阔，能够推动高能量QCD研究的发展。

Physics Letters B 786 (2018) 472–476

Contents lists available at ScienceDirect

Physics Letters B

www.elsevier.com/locate/physletb

CGC/saturation approach: Secondary Reggeons and ρ = Re/Im

dependence

on energy

E. Gotsman

a,∗

, E. Levin

a,b

, I. Potashnikova

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

18 July 2018

Received

in revised form 16 September

2018

Accepted

10 October 2018

Available

online 11 October 2018

Editor:

A. Ringwald

In this letter we demonstrate that a model based on the CGC/saturation approach, successfully describes

soft interaction collisions for the wide range of W =

√

s = 30 GeV ÷ 13 TeV including the new TOTEM

data at 13 TeV. We have now incorporated the secondary Reggeons in our approach this enables us

to describe the complete set of the soft data, including the energy behavior of ρ the ratio of the real

to imaginary parts of the elastic scattering amplitude. We argue that it is premature to claim that an

odderon contribution is necessary, but estimate its possible strength as 1 mb to the real part of the

amplitude at W = 13 TeV. We show that the odderon contribution depends on the value of energy

leading

to Re A

(

s, t = 0

)

8mb at W = 21.2GeV. Bearing this in mind we do not believe that ρ at high

energies is the appropriate observable for detecting the odderon contribution. The successful description

of the soft data in the wide range of energy strengthens our claim that the CGC/saturation approach is

the only viable candidate for an effective theory for high energy QCD.

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

1. Introduction

In our recent papers [1,2]we have constructed a model, which

allows us to discuss soft and hard processes on the same footing.

This model is based on the CGC/saturation approach (see Ref. [3]

for

a review) and on our previous attempts to build such a

model [4–11].

The

model, that we proposed in Refs. [1,2], successfully de-

scribes

the DIS data from HERA, the total, inelastic, elastic and

diffractive cross sections, the t-dependence of these cross sections,

as well as the inclusive production and rapidity and angular cor-

relations

in a wide range of high energies up to 13 TeV. In this

letter we include in our formalism the contribution of the sec-

ondary

Reggeons that allows us to expand the region of energies

down to W =50 GeV. The main motivation for this is our need to

describe the energy behavior of the ratio ρ = Re/Im of the scatter-

ing

amplitude, to which the secondary reggeons make a signiﬁcant

contribution. The new TOTEM data [12]shows that the value of

Corresponding author.

E-mail

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

eugeny.levin@usm.cl (E. Levin), irina.potashnikova@usm.cl (I. Potashnikova).

ρ = 0.1 ±0.01(0.09 ±0.01) is lower than expected, and this ignited

the hot discussion about the possible contribution of the odd-

eron [13–20].

The odderon contribution to the negative signature

appears naturally in perturbative QCD, with an intercept which is

equal to zero [21,22]. In other words, we expect that the odderon

will lead to a constant real part of the scattering amplitude at high

energy, while the other contributions from the pomeron and the

secondary reggeons result in a decreasing real part. Consequently,

it is apt to elucidate the odderon contribution by investigating ρ

at high energies.

The

main result of this letter is (i) that ρ ≈ 0.1at W =13 TeV

appears naturally in our approach without having to assume an

odderon contribution; and (ii) the value of its possible contribution

is about 1mb in the real part of the scattering amplitude, indepen-

dent

of energy. The small and decreasing value of ρ at high ener-

gies

stems from the CGC motivated amount of shadowing (screen-

ing)

corrections and furnishes strong support for our approach.

Our

model incorporates two ingredients: the achievements

of the CGC/saturation approach, and the pure phenomenological

treatment of the long distance non-perturbative physics, necessary,

due to the lack of theoretical understanding of the conﬁnement of

quark and gluons.

https://doi.org/10.1016/j.physletb.2018.10.017

0370-2693/

SCOAP

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