Unified description of diffractive deep inelastic scattering with saturation

Marquet, Cyrille

doi:10.1103/physrevd.76.094017

Cited by 89 publications

(150 citation statements)

References 68 publications

(98 reference statements)

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“…We can then show that the interaction between the resulting qqg pair and the proton can also be expressed in terms of the dipole amplitude T , leading again to a contribution proportional to T 2 . Based on the new parametrisation [6], it has been shown [9] that the HERA measurements of the diffractive structure function are well reproduced. The final observable we shall consider is the production of exclusive vector mesons or on-shell photons (DVCS).…”

Section: Dis 2008mentioning

confidence: 99%

The dipole picture in DIS: saturation and heavy quarks

Soyez¹

2008

Proceedings of the XVI International Workshop on Deep-Inelastic Scattering and Related Topics

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We discuss the description of the proton structure function within the dipole factorisation framework. We parametrise the forward dipole amplitude to account for saturation as predicted by the small-x QCD evolution equations. Contrarily to previous models, the saturation scale does not decrease when taking heavy quarks into account. We show that the same dipole amplitude also allows to reproduce diffractive data and exclusive vector meson production.In these proceedings [1] we shall concentrate on Deep Inelastic Scattering (DIS) at small x. In this regime, the photon-proton cross-section can be factorised as a convolution between the wavefunction for a virtual photon to fluctuate into a quark-antiquark pair and the interaction T between this colourless dipole and the proton:where the factor 2πR 2 p arises from integration over the impact parameter. The photon wavefunction can be computed from perturbative QED and we are left with the parametrisation of the hadronic dipole amplitude. To that aim, we usually rely on the observation that the small-x DIS data satisfy geometric scaling [2], meaning that, instead of being a function of both Q 2 and x, they appear to be a function of τ = log(Q 2 /Q 2 s (x)) = log(Q 2 /Q 2 0 )−λ log(1/x) only, where Q s (x) is known as the saturation scale. Since r ∼ 1/Q in (1), this property suggests that the dipole amplitude is a function of rQ s (x) only.Since the small-x domain extends down to small Q 2 , the dipole amplitude is sensitive to the unitarity bound T < 1. There are two broad classes of models which differ by their way to implement that boundary. The first approach is to use an eikonal form as initially proposed in [3], followed by more precise analysis to incorporate DGLAP evolution and masses for the heavy quarks [4].The second approach, that we follow through these proceedings, is to use predictions directly from the Balitsky-Kovchegov equation describing the QCD evolution to small x. It resums the BFKL logarithms of 1/x and satisfies unitarity by including saturation effects.In contrast with the eikonal models which include it by hand, it has been proven [5] that the solutions of the BK equation satisfy the property of geometric scaling. More precisely, T (r, x) rQs 2

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Section: Dis 2008mentioning

confidence: 99%

The dipole picture in DIS: saturation and heavy quarks

Soyez¹

2008

Proceedings of the XVI International Workshop on Deep-Inelastic Scattering and Related Topics

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“…Dependence of the coherent cross section on momentum transfer t is given by (24). It is seen that it decreases as 1/|t| 3 at |t| 1/R 2 A , where R A is the nuclear radius.…”

Section: Introductionmentioning

confidence: 99%

“…Our goal is to make predictions for DIS on a nucleus at the EIC kinematic region based on the CGC theory. We argue that diffractive hadron production is very sensitive to parameters of CGC and thus can be very effective instrument in extracting properties of the nuclear matter at low x. Gluon saturation effects on diffractive gluon production in DIS on proton at HERA have been discussed in [12][13][14][15][16][17][23][24][25]. A concise discussion of the gluon saturation effects in semi-inclusive DIS on nuclei is given in [26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Diffractive hadron production in deep inelastic scattering off heavy nuclei and gluon saturation

Tuchin

2011

Phys. Rev. D

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We calculate the cross section for diffractive hadron production in deep inelastic scattering off heavy nuclei in the framework of gluon saturation/color glass condensate. We analyze the kinematic region of the future Electron-Ion Collider. We argue that coherent and incoherent diffractive channels are very sensitive to the structure of the nuclear matter at low x. This expresses itself in a characteristic dependence of the cross sections on rapidity and transverse momentum of the produced hadron and on the nuclear weight. We also discuss dependence on the scattering angle and argue that both coherent and incoherent cross sections may be within experimental reach at EIC.

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“…The so called dipole picture has been very successful in explaining both exclusive and diffractive HERA measurements in the high-energy limit [11,12], by employing some phenomenological vector meson light-front wavefunction (LFWF) [7,11]. Such phenomenological models contain free parameters that weaken the predictive power of the diffractive heavy quarkonium production process.…”

Section: Introductionmentioning

confidence: 99%

Charmonium spectrum and diffractive production in a light-front Hamiltonian approach

Chen

Maris

et al. 2017

Nuclear and Particle Physics Proceedings

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We study exclusive charmonium production in diffractive deep inelastic scattering and ultra-peripheral heavyion collisions within the dipole picture. The mass spectrum and light-front wavefunctions of charmonium are obtained from the basis light-front quantization approach, using the one-gluon exchange interaction plus a confining potential inspired by light-front holography. We apply these light-front wavefunctions to exclusive charmonium production. The resulting cross sections are in reasonable agreement with electron-proton collision data at HERA and ultra-peripheral nucleus collision measurements at RHIC and LHC. The charmonium cross-section has model dependence on the dipole model. We observe that the cross-section ratio of excited states to the ground state has a weaker dependence than the cross-section itself. We suggest that measurements of excited states of heavy quarkonium production in future electron-ion collision experiments will impose rigorous constraints on heavy quarkonium light-front wavefunctions, thus improving our understanding of meson structure, which eventually will help us develop a precise description of the gluon distribution function in the small-x regime.

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Unified description of diffractive deep inelastic scattering with saturation

Cited by 89 publications

References 68 publications

The dipole picture in DIS: saturation and heavy quarks

The dipole picture in DIS: saturation and heavy quarks

Diffractive hadron production in deep inelastic scattering off heavy nuclei and gluon saturation

Charmonium spectrum and diffractive production in a light-front Hamiltonian approach

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