Exclusive production of pions and the pion distribution amplitude

Fagundes, D. A.; Luna, E. G. S.; Natale, A. A.; Peláez, Marcela

doi:10.1088/1361-6471/ab6947

Cited by 4 publications

(3 citation statements)

References 102 publications

(186 reference statements)

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“…However, these processes are potentially divergent at low transferred momenta, and for this reason they must be regularized by means of some cutoff procedure. In a nonperturbative QCD context, one natural regulator was introduced by Cornwall some time ago [33], and since then has become an important feature in eikonalized models [34][35][36][37][38]. This regularization process is based on the increasing evidence that the gluon may develop a momentum-dependent mass, which introduces a natural scale able to separate the perturbative from the nonperturbative QCD region.…”

Section: Introductionmentioning

confidence: 99%

Forward elastic scattering: dynamical gluon mass and semihard interactions

et al. 2019

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In the context of a QCD-based model with even-under-crossing amplitude dominance at highenergies, it is shown that the pp andpp elastic scattering data on σtot and ρ above 10 GeV are quite well described, especially the recent TOTEM data at 13 TeV. Specifically, we investigate the role of low-x parton dynamics in dictating the high-energy behavior of forward scattering observables at LHC energies, by using a nonpertubative cutoff linked to the dynamical generation of a gluon mass. Unexpected features of the data, such as the rather small ρ value at 13 TeV recently reported by the TOTEM Collaboration, are addressed using an eikonalized elastic amplitude, where unitarity and analyticity properties are readily build in. The model provides an accurate global description of σtot and ρ with pre-and post-LHC fine-tuned parton distributions, CTEQ6L and CT14, even if data at 8 and 13 TeV are not included in the dataset analyzed. These findings suggest that the low-x parton dynamics, as well as the nonperturbative dynamics of QCD, play a major role in the driving mechanism behind the pre-asymptotic ρ decrease at LHC energies.

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Section: Introductionmentioning

confidence: 99%

Forward elastic scattering: dynamical gluon mass and semihard interactions

et al. 2019

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“…Similar to the proton DAs introduced in the previous sections, the pion DA can also be expressed as the series in the the eigenfunctions of the leading order evolution equation (e.g. [95]):…”

Section: A Pionmentioning

confidence: 99%

Perturbative Calculations of Gravitational Form Factors at Large Momentum Transfer

Tong¹,

Ma²,

Feng³

2022

Preprint

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We perform a perturbative QCD analysis of the gravitational form factors (GFFs) of nucleon at large momentum transfer. We derive the explicit factorization formula of the GFFs in terms of twist-3 and twist-4 light-cone distribution amplitudes of nucleon. Power behaviors for these GFFs are obtained from the leading order calculations. Numeric results of the quark and gluon contributions to various GFFs are presented with model assumptions for the distribution amplitudes in the literature. We also present the perturbative calculations of the scalar form factor P |F 2 |P for pion and proton at large momentum transfer.

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“…Here, we will use the value m G = 400 MeV that is consistent with the usual values in Refs. [43][44][45]. Moreover, the gluon PDF probed in the low scale µ 2 = m 2 G = 0.16 GeV 2 will be given by a prediction from the parton saturation physics,…”

Section: A Asymptotic Modelmentioning

confidence: 99%

Soft diffraction within the QCD color dipole picture

et al. 2020

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In this work we consider the QCD parton saturation models to describe soft interactions at the high energy limit. The total and elastic cross sections as well as the elastic slope parameter are obtained for proton-proton and pion-proton collisions and compared to recent experimental results. The analyses are done within the color dipole formalism taking into account saturation models which have been tested against DIS data. The main point is that the match between soft and hard interaction occurs in the saturation region which can be described by high density QCD approaches. Discussion is performed on the main theoretical uncertainties associated with calculations.

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Exclusive production of pions and the pion distribution amplitude

Cited by 4 publications

References 102 publications

Forward elastic scattering: dynamical gluon mass and semihard interactions

Forward elastic scattering: dynamical gluon mass and semihard interactions

Perturbative Calculations of Gravitational Form Factors at Large Momentum Transfer

Soft diffraction within the QCD color dipole picture

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