The GPD H̃ and spin correlations in wide-angle Compton scattering

Kroll, P.

doi:10.1140/epja/i2017-12326-2

Cited by 13 publications

(17 citation statements)

References 40 publications

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“…holds as is the case for wide-angle Compton scattering [20,39]. Thus, the helicity correlations may provide a characteristic signal for the dominance of twist-3 contribution in photoproduction of pseudoscalar mesons.…”

Section: B Spin Effectsmentioning

confidence: 85%

“…Data at larger −t are to be expected from the upcoming Fermilab MINERvA experiment. From data on the helicity correlations A LL and/or K LL in wide-angle Compton scattering we may also learn about the large −t behavior of the GPDH [20]. Measurements of these helicity correlations are planned at Jefferson Lab.…”

Section: Gpds and Form Factors At Large-tmentioning

confidence: 99%

“…Measurements of these helicity correlations are planned at Jefferson Lab. On the basis of the parametrization (13) and (14) (with the unpolarized parton densities replaced by the polarized ones) and the results onH given in [3] several examples of the large −t behavior ofH are discussed in [20]. For the numerical estimates of observables for wide-angle photoproduction of pseudoscalar mesons to be presented in Sec.…”

Section: Gpds and Form Factors At Large-tmentioning

confidence: 99%

“…For the numerical estimates of observables for wide-angle photoproduction of pseudoscalar mesons to be presented in Sec. V below we will use example 1 quoted in [20].…”

Section: Gpds and Form Factors At Large-tmentioning

confidence: 99%

“…As for wide-angle Compton scattering [20,39] the most interesting spin-dependent observables are the correlations of the helicities of the incoming photon and the incoming, A LL , or outgoing proton, K LL :…”

Section: B Spin Effectsmentioning

confidence: 99%

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Twist-3 contributions to wide-angle photoproduction of pions

Kroll

Passek‐Kumerički

2018

Phys. Rev. D

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We investigate wide-angle π 0 photoproduction within the handbag approach to twist-3 accuracy. In contrast to earlier work both the 2-particle as well as the 3-particle twist-3 contributions are taken into account. It is shown that both are needed for consistent results that respect gauge invariance and crossing properties. The numerical studies reveal the dominance of the twist-3 contribution. With it fair agreement with the recent CLAS measurement of the π 0 cross section is obtained. We briefly comment also on wide-angle photoproduction of other pseudoscalar mesons.

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Section: B Spin Effectsmentioning

confidence: 85%

Section: Gpds and Form Factors At Large-tmentioning

confidence: 99%

Section: Gpds and Form Factors At Large-tmentioning

confidence: 99%

“…For the numerical estimates of observables for wide-angle photoproduction of pseudoscalar mesons to be presented in Sec. V below we will use example 1 quoted in [20].…”

Section: Gpds and Form Factors At Large-tmentioning

confidence: 99%

Section: B Spin Effectsmentioning

confidence: 99%

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Twist-3 contributions to wide-angle photoproduction of pions

Kroll

Passek‐Kumerički

2018

Phys. Rev. D

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Exclusive photoproduction of π0 up to large values of Mandelstam variables s,t, and u with CLAS

Kunkel¹,

Amaryan²,

Strakovsky³

et al. 2018

Phys. Rev. C

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Exclusive photoproduction cross sections have been measured for the process γp → pπ 0 [e + e − (γ )] with the Dalitz decay final state using tagged photon energies in the range of E γ = 1.275-5.425 GeV. The complete angular distribution of the final state π 0 , for the entire photon energy range up to large values of t and u, has been measured for the first time. The data obtained show that the cross section dσ/dt, at mid to large angles, decreases with energy as s −6.89±0.26 . This is in agreement with the perturbative QCD quark counting rule prediction of s −7 . Paradoxically, the size of angular distribution of measured cross sections is greatly underestimated by the QCD-based generalized parton distribution mechanism at highest available invariant energy s = 11 GeV 2 . At the same time, the Regge-exchange-based models for π 0 photoproduction are more consistent with experimental data.

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Nucleon axial form factor from generalized parton distributions

2019

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It is well established that the nucleon form factors can be related to Generalized Parton Distributions (GPDs) through sum-rules. On the other hand, GPDs can be expressed in terms of Parton Distribution Functions (PDFs) according to Diehl's model. In this work, we use this model to calculate polarized GPDs for quarks ( Hq) using the available polarized PDFs obtained from the experimental data, and then study the axial form factor of nucleon. We determine parameters of the model using standard χ 2 analysis of experimental data. It is shown that some parameters should be readjusted, as compared to some previously reported values, to obtain better consistency between the theoretical predictions and experimental data. Moreover, we study in details the uncertainty of nucleon axial form factor due to various sources.

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The GPD H̃ and spin correlations in wide-angle Compton scattering

Cited by 13 publications

References 40 publications

Twist-3 contributions to wide-angle photoproduction of pions

Twist-3 contributions to wide-angle photoproduction of pions

Exclusive photoproduction of π0 up to large values of Mandelstam variables s,t, and u with CLAS

Nucleon axial form factor from generalized parton distributions

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