Saturation in diffractive deep inelastic eA scattering

Kugeratski, M. S.; Gonçalves, V. P.; Navarra, F. S.

doi:10.1140/epjc/s2006-02517-7

Cited by 52 publications

(81 citation statements)

References 42 publications

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“…Note that we systematically find a nuclear suppression of diffraction, to be contrasted with the enhancement found for smaller masses in [9,40,43].…”

Section: Diffraction Off Nuclei In the Schwimmer Modelcontrasting

confidence: 72%

“…Nuclear DIS possess a rich structure and have recently triggered significant activity [9,25,[36][37][38][39][40][41][42][43]. Generally speaking, one naturally expects a large diffractive cross section in the nuclear case due to the large probability of rescattering.…”

Section: Diffraction Off Nuclei In the Schwimmer Modelmentioning

confidence: 99%

“…Generally speaking, one naturally expects a large diffractive cross section in the nuclear case due to the large probability of rescattering. Several groups predict a strong enhancement of the fraction of diffractive events, up to 30-40% [9,40,43] (compared to 15% in γ * p at HERA), in the nuclear case. Note that most of this enhancement derive from the elastic component, while scattering of higher-order Fock-states are found to be suppressed [25,41,43].…”

Section: Diffraction Off Nuclei In the Schwimmer Modelmentioning

confidence: 99%

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Nuclear shadowing in Glauber–Gribov theory with Q 2-evolution

et al. 2010

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We consider deep inelastic scattering off nuclei in the Regge limit within the Glauber-Gribov model. Using unitarized parton distribution functions for the proton, we find sizeable shadowing effects on the nuclear total and longitudinal structure functions, F A 2 and F A L , in the low-x limit. Extending a fan-diagram analysis for the large-mass region of coherent diffraction off nuclei to high Q 2 , we also find significant shadowing effects in this kinematical regime. Finally, we discuss shortcomings of our approach and possible extensions of the model to other kinematical regimes.

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“…Note that we systematically find a nuclear suppression of diffraction, to be contrasted with the enhancement found for smaller masses in [9,40,43].…”

Section: Diffraction Off Nuclei In the Schwimmer Modelcontrasting

confidence: 72%

Section: Diffraction Off Nuclei In the Schwimmer Modelmentioning

confidence: 99%

Section: Diffraction Off Nuclei In the Schwimmer Modelmentioning

confidence: 99%

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Nuclear shadowing in Glauber–Gribov theory with Q 2-evolution

et al. 2010

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“…The basic assumption of the Model II is that it assumes that the nucleus is so dense that it can be seen as a large hadron with a continuous particle distribution (For details see Ref. [46]). Therefore, it can be considered as a first approximation for the asymptotic regime of the saturation physics at very large energies.…”

Section: B Electron -Nucleus Collisionsmentioning

confidence: 99%

Probing gluon number fluctuation effects in future electron–hadron colliders

2014

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The description of the QCD dynamics in the kinematical range which will be probed in the future electron -hadron colliders is still an open question. Although phenomenological studies indicate that the gluon number fluctuations, which are related to discreteness in the QCD evolution, are negligible at HERA, the magnitude of these effects for the next generation of colliders still should be estimated. In this paper we investigate inclusive and diffractive ep observables considering a model for the physical scattering amplitude which describes the HERA data. Moreover, we estimate, for the first time, the contribution of the fluctuation effects for the nuclear structure functions. Our results indicate that the study of these observables in the future colliders can be useful to constrain the presence of gluon number fluctuations.

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“…In order to discriminate between these different models and test the CGC physics, it would be very important to consider an alternative search. To this purpose, the future electron-nucleus colliders offers a promising opportunity [20,21,22,23,24].The color glass condensate is important in itself as a new state of matter. However, apart from that, we need * Electronic address: babi@if.usp.br // duraes@mackenzie.br // navarra@if.usp.br // szpigel@mackenzie.br to know very well its properties since the CGC forms the initial state of the fluid created in nucleus-nucleus collisions.…”

mentioning

confidence: 99%

Charm and longitudinal structure functions within the Kharzeev-Levin-Nardi model

et al. 2009

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We use the Kharzeev-Levin-Nardi (KLN) model of the low x gluon distributions to fit recent HERA data on FL and F c 2 (F b 2 ). Having checked that this model gives a good description of the data, we use it to predict FL and F c 2 to be measured in a future electron-ion collider. The results are similar to those obtained with the de Florian-Sassot and Eskola-Paukkunen-Salgado nuclear gluon distributions. The conclusion of this exercise is that the KLN model, simple as it is, may still be used as an auxiliary tool to make estimates both for heavy ion and electron-ion collisions. The small-x regime of QCD has been intensely investigated in recent years (for recent reviews see, e.g. [1,2]). The main prediction is a transition from the linear regime described by the DGLAP dynamics to a non-linear regime where parton recombination becomes important in the parton cascade and the evolution is governed by a non-linear equation. At very small values of x we expect to observe the saturation of the growth of the gluon densities in hadrons and nuclei. One of the main topics of hadron physics to be explored in the new accelerators, such as the LHC and possibly the future electron-ion collider is the existence of this new component of the hadron wave function, denoted Color Glass Condensate (CGC) [1].The search for signatures of the CGC has been subject of an active research (for recent reviews see, e.g. [1]). Saturation models [2,3,4,5,6,7] can successfully describe HERA data in the small x and low Q 2 region. Moreover, some properties which appear naturally in the formalism of the color glass condensate have been observed experimentally. These include, for example, geometric scaling [8,9,10] and the supression of high p T hadron yields at forward rapidities in dAu collisions [11,12,13,14,15,16]. However, it has been shown that both geometric scaling [17] and high p T supression [18,19] can be understood with other explanations, not based on saturation physics.In view of these (and others) results we may conclude that there is some evidence for saturation at HERA and RHIC. However, more definite conclusions are not yet possible. In order to discriminate between these different models and test the CGC physics, it would be very important to consider an alternative search. To this purpose, the future electron-nucleus colliders offers a promising opportunity [20,21,22,23,24].The color glass condensate is important in itself as a new state of matter. However, apart from that, we need * Electronic address: babi@if.usp.br // duraes@mackenzie.br // navarra@if.usp.br // szpigel@mackenzie.br to know very well its properties since the CGC forms the initial state of the fluid created in nucleus-nucleus collisions. Any detailed simulation of a heavy ion collision needs a realistic Ansatz for the initial conditions. This would correspond to knowing accurately the unintegrated gluon distribution in the projectile and in the target. These distributions will presumably be known in the future, with the help of the results of deep inelastic sca...

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Saturation in diffractive deep inelastic eA scattering

Cited by 52 publications

References 42 publications

Nuclear shadowing in Glauber–Gribov theory with Q 2-evolution

Nuclear shadowing in Glauber–Gribov theory with Q 2-evolution

Probing gluon number fluctuation effects in future electron–hadron colliders

Charm and longitudinal structure functions within the Kharzeev-Levin-Nardi model

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