Regge models of the proton structure function with and without hard pomeron: A comparative analysis

Desgrolard, P.; Martynov, Y.

doi:10.1007/s100520100811

Cited by 25 publications

(47 citation statements)

References 25 publications

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“…The reason for this particular choice is that in this model the soft Pomeron having intercept equal one, thus it does not violate unitarity for hadron-hadron and vector meson production at higher energies. Moreover, it describes with good agreement hadronic cross section and even DIS data in a wide range of photon virtualities [27]. For meson production on proton target, our starting point is the recent work of Ref.…”

Section: Introductionmentioning

confidence: 71%

Nuclear exclusive vector meson photoproduction

Gonçalves

Machado

2004

Eur. Phys. J. C

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We calculate the nuclear cross section for vector meson exclusive photoproduction within the QCD color dipole picture and in the Regge approach. For the former approach, we have considered the phenomenological saturation model, whereas for the latter we use a model based on the dipole Pomeron framework. Theoretical estimates for scattering on both light and heavy nuclei are given over a large range on energy.

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Section: Introductionmentioning

confidence: 71%

Nuclear exclusive vector meson photoproduction

Gonçalves

Machado

2004

Eur. Phys. J. C

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“…More precisely, even if we assume a new singularity at Q 2 = 0, its contribution must be equal to zero for Q 2 = 0. Indeed the analysis of the data [20] shows that there is no need for such a new contribution.…”

Section: General Formalismmentioning

confidence: 99%

“…It is not clear if the hard Pomeron is ultimately needed to describe the data or not (see for example [20]). We attempt to describe the data in the framework of "soft" physics, so that not we do not violate unitarity.…”

Section: Introductionmentioning

confidence: 99%

A universal Regge pole model for all vector meson exclusive photoproduction by real and virtual photons

2002

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A model based on a dipole Pomeron framework for vector meson exclusive photoproduction by real and virtual photons shows very good agreement with the experimental data. The model does not violate unitarity constrains and describes in a universal manner all the available data for ρ, ω, ϕ, J/ψ and Υ vector meson photoproduction in the region of energies 1.7 ≤ W ≤ 250 GeV and photon virtualities 0 ≤ Q 2 ≤ 35 GeV 2 .

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“…Finally, we must insist on the fact that the combination of two simple poles (a soft and a hard pomeron) is only one of several possibilities. For soft data and DIS data, other models exist [12] which are also compatible with unitarity, and which produce equally good fits. A study of elastic scattering [13] may help distinguish the two-simplepole model from the tripole and the dipole, as it predicts a contribution with a fast rise but a small slope, which is not natural in the competing models.…”

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confidence: 99%

A review of the hard pomeron in soft diffraction

et al. 2005

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We review the evidence for the presence of a hard singularity in soft forward amplitudes, and give an estimate of its trajectory and couplings.In 1998, Donnachie and Landshoff showed that DIS data at small x can be described by the superposition of two Regge exchanges : the soft and the hard pomeron, and that both are well approximated by simple poles [1]. Their fit to HERA data then leads to the conclusion that the soft pomeron is a higher-twist contribution. It was further suggested [2] that the DGLAP evolution has to be performed in a non-trivial manner : as it is of perturbative origin, the singularity that it introduces at J = 1 should be considered only if one is far away from it, as otherwise perturbation theory breaks down. Applying this philosophy to the evolution leads to a prediction of the Q 2 dependence of the hard pomeron from DGLAP evolution, and to a successful description of F 2 and F L [3,4], provided that the gluon distribution is associated with the hard pomeron contribution. The obtained fit can then be extended to higher x [3]. This leads to the conclusion that the data at large Q 2 and t = 0 contain a sizable contribution from a hard pomeron with intercept α h (t = 0) ≈ 1.4.Furthermore, the same idea can be used to describe F c 2 [5] as well as vector-meson photoproduction [6]. In this case, the main characteristic of the data is a modification of the energy dependence of the cross section as the vector-meson mass increases, and a flattening of the t dependence at high t. Both effects can be interpreted as a signature of the contribution of a hard pomeron, provided it has a rather flat trajectory:The question remained however to understand why such a hard pomeron had not been seen before, and what happened to it at t = Q 2 = 0. The first remark is that it is

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Regge models of the proton structure function with and without hard pomeron: A comparative analysis

Cited by 25 publications

References 25 publications

Nuclear exclusive vector meson photoproduction

Nuclear exclusive vector meson photoproduction

A universal Regge pole model for all vector meson exclusive photoproduction by real and virtual photons

A review of the hard pomeron in soft diffraction

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