A phenomenological analysis of the longitudinal structure function at small x and low Q
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Gonçalves, V. P.; Machado, M. V. T.

doi:10.1140/epjc/s2004-01998-6

Cited by 18 publications

(15 citation statements)

References 54 publications

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“…It is believed that this observable can be used to constrain the QCD dynamics at small x in ep collisions at HERA (See, e.g. [36]). One of our goals is to verify if this assumption is also valid in eA collisions.…”

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confidence: 99%

Could saturation effects be visible in a future electron–ion collider?

et al. 2009

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We expect to observe parton saturation in a future electron -ion collider. In this letter we discuss this expectation in more detail considering two different models which are in good agreement with the existing experimental data on nuclear structure functions. In particular, we study the predictions of saturation effects in electron -ion collisions at high energies, using a generalization for nuclear targets of the b-CGC model, which describes the ep HERA quite well. We estimate the total, longitudinal and charm structure functions in the dipole picture and compare them with the predictions obtained using collinear factorization and modern sets of nuclear parton distributions. Our results show that inclusive observables are not very useful in the search for saturation effects. In the small x region they are very difficult to disentangle from the predictions of the collinear approaches . This happens mainly because of the large uncertainties in the latter. On the other hand, our results indicate that the contribution of diffractive processes to the total cross section is about 20 % at large A and small Q 2 , allowing for a detailed study of diffractive observables. The study of diffractive processes becomes essential to observe parton saturation.

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confidence: 99%

Could saturation effects be visible in a future electron–ion collider?

et al. 2009

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“…For comparison, we also present the prediction obtained using the Altarelli-Martinelli equation and the GRV98 parameterization for the solution of the DGLAP evolution equation (for details see Ref. [45]). In this case we have that the KKT parameterization describe reasonably the few data available [47], similarly to the GBW and IIM parameterizations.…”

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confidence: 99%

Testing universality of the color glass condensate descriptions

2005

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Perturbative Quantum Chromodynamics (pQCD) predicts that the small-x gluons in a hadron wavefunction should form a Color Glass Condensate (CGC), which has universal properties, which are the same for all hadrons or nuclei. Assuming this property, in this paper we cross relate the current CGC descriptions of the ep HERA data and dAu RHIC data. In particular, we use the quark dipole scattering amplitude recently proposed by Kharzeev, Kovchegov and Tuchin (KKT) to explain the high pT particle suppression observed in dAu collisions at RHIC in our calculations of the proton and longitudinal structure functions. We present a detailed comparison between this parameterization and those proposed to describe the ep HERA data. We find out that, due to its peculiar dependence on the energy and dipole separation, the KKT parameterization is able to describe the experimental ep data only in a limited kinematical range of photon virtualities.

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“…The analysis of the behaviour of the longitudinal structure function F L (x, Q 2 ) in the saturatation models was done in Ref. [14] 3 . In Fig.1 we demonstrate our k T −factorization description of F L (Q 2 ) at fixed W with the unintegrated gluon distribution proposed in Ref.…”

Section: The Sf F L At Fixed W In Hera Rangementioning

confidence: 99%