Nucleon spin structure functions at NNLO in the presence of target mass corrections and higher twist effects

Khanpour, Hamzeh; Monfared, S. Taheri; Tehrani, S. Atashbar

doi:10.1103/physrevd.95.074006

Cited by 44 publications

(88 citation statements)

References 153 publications

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“…Since that time, along with the studies of unpolarized parton distribution functions (PDFs), many experimental, theoretical and phenomenological investigations have been performed to understand the constituents of the proton's spin and also determine their distributions. In this regard, the determination of polarized PDFs (PPDFs), which describe the structure of a nucleon in a helicity eigenstate, by performing a global analysis of available experimental data has also been of great interest [2][3][4][5][6][7][8][9][10][11][12][13]. On the other hand, the structure of nucleon both in unpolarized and polarized cases can be investigated in more detail using generalized parton distributions (GPDs) [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28] which comprise important concepts of Quantum Chromodynamics (QCD).…”

Section: Introductionmentioning

confidence: 99%

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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Section: Introductionmentioning

confidence: 99%

Nucleon axial form factor from generalized parton distributions

2019

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“…Parton distribution functions (PDFs) extracted from global QCD fits of deep inelastic electron proton (ep) scattering at HERA as well as proton-(anti)proton (pp) collision at hadron colliders such as LHC, are a fundamental input into hadron collider physics and has been very important in the investigation of the partonic structure of the nucleon, (see [1][2][3][4] for a recent review and [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] for recent determination of different types of PDFs). Much effort also have been made by theoretical and experimental particle physics communities to improve our understanding on the partonic structure of the nucleon and nuclei [2,[22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41].…”

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confidence: 99%

First QCD analysis of charged hadron fragmentation functions and their uncertainties at next-to-next-to-leading order

2018

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In this paper, we present SGK18 FFs, a first global QCD analysis of parton-to-unidentified charged hadrons fragmentation functions (FFs) at next-to-next-to-leading order (NNLO) accuracy in perturbative QCD. This analysis is based on single-inclusive charged hadron production in electronpositron (e − e + ) annihilation. The uncertainties in the extraction of SGK18 FFs as well as the corresponding observables are estimated using the "Hessian" technique. We study the quality of the SGK18 FFs determined in this analysis by comparing with the recent results in literature. We also show how SGK18 FFs results describe the available data for single-inclusive unidentified charged hadron production in e − e + annihilation. We demonstrate that the theoretical uncertainties due to the variation of the renormalization and factorization scales improve when NNLO QCD corrections are considered. We find that the resulting SGK18 FFs are in good agreement with all data analyzed and the inclusion of NNLO corrections tends to improve the data description with somewhat smaller uncertainty.

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“…The uncertainties of nucleon FFs as well as the leadingnucleon structure functions have been obtained using the Hessian method [21,22,23,24,25,26,27,28].…”

Section: Total Data Points 694mentioning

confidence: 99%

Global analysis on determination of fracture functions considering sea quark asymmetries in the nucleon

Mohsenabadi¹,

Taghavi-Shahri²,

Javidan³

2018

Proceedings of XVII International Conference on Hadron Spectroscopy and Structure — PoS(Hadron2017)

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Several experiments at the electron-proton (ep) collider HERA have collected high precision data on the spectrum of leading-proton and leading-neutron carrying a large fraction of the proton's energy. In this paper, we have analyzed recent experimental data on the production of leadingnucleon in deep inelastic scattering (DIS) processes at HERA in the framework of a perturbative QCD (pQCD). An approach based on the fractures functions framework has been used, and the nucleon fracture functions (nucleon FFs) M (n/p) 2 (x, Q 2 , x L ) have been extracted from global QCD analysis of DIS data measured by ZEUS collaboration at HERA. We show that the approach of fracture functions formalisem allows us phenomenologically parametrize the nucleon FFs at the input scale, Q 2 0 . Considering leading-nucleon production data in the DIS processes, we present the results for the separate parton distributions for all parton species. The extracted results from the t-integrated leading-baryon fracture functions, F LB(3) 2 (x, Q 2 , x L ) are in good agreement with all DIS data analyzed, for a wide range of longitudinal momentum fraction x L as well as scaled fractional momentum variable x. XVII INTERNATIONAL CONFERENCE ON HADRON SPECTROSCOPY AND STRUCTURE

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Nucleon spin structure functions at NNLO in the presence of target mass corrections and higher twist effects

Cited by 44 publications

References 153 publications

Nucleon axial form factor from generalized parton distributions

Nucleon axial form factor from generalized parton distributions

First QCD analysis of charged hadron fragmentation functions and their uncertainties at next-to-next-to-leading order

Global analysis on determination of fracture functions considering sea quark asymmetries in the nucleon

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