Global analysis of nuclear parton distribution functions and their uncertainties at next-to-next-to-leading order

Khanpour, Hamzeh; Tehrani, S. Atashbar

doi:10.1103/physrevd.93.014026

Cited by 113 publications

(134 citation statements)

References 135 publications

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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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“…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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“…It has also been recognised as a powerful tool to study the fundamental properties of quark-gluon plasma (QGP) created in these collisions [70][71][72][73][74][75][76]. Furthermore, since the nuclear parton distribution functions (nPDFs) [77][78][79][80][81][82] (especially of the gluon) cannot be well determined using the available nuclear deep inelastic scattering (DIS) and Drell-Yan experimental data compared with the PDFs of the free nucleon, the measurements of prompt photon production in heavy-ion collisions can be used to constrain the gluon distributions within nuclei [83][84][85][86]. One of the important questions in the theoretical calculation of the particle production cross sections in nuclear collisions is that whether the factorization theorem [87][88][89][90] of collinear singularities is valid or not in this case (note that it is established in the case of hadronic collisions).…”

Section: Advances In High Energy Physicsmentioning

confidence: 99%

Predictions for the Isolated Prompt Photon Production at the LHC ats= 13 TeV

Goharipour

Mehraban

2017

Advances in High Energy Physics

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The prompt photon production in hadronic collisions has a long history of providing information on the substructure of hadrons and testing the perturbative techniques of QCD. Some valuable information about the parton densities in the nucleon and nuclei, especially of the gluon, can also be achieved by analysing the measurements of the prompt photon production cross section whether inclusively or in association with heavy quarks or jets. In this work, we present predictions for the inclusive isolated prompt photon production in pp collisions at center-of-mass energy of 13 TeV using various modern PDF sets. The calculations are presented as a function of both photon transverse energy and pseudorapidity for the ATLAS kinematic coverage. We also study in detail the theoretical uncertainty in the cross sections due to the variation of the renormalization, factorization, and fragmentation scales. Moreover, we introduce and calculate the ratios of photon momenta for different rapidity regions and study the impact of various input PDFs on such quantity.

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“…Here, we use the Hessian method (or error matrix approach) [54], which is based on linear error propagation and involves the production of eigenvector PDF sets suitable for convenient use by the end user. Originally, the Hessian method was used in MRST [55] and MSTW08 [56] analyses and we also applied this approach in our previous works [57][58][59]. Therefore, hereinafter we concentrate on this method.…”

Section: Uncertainties On Input Pdfsmentioning

confidence: 99%

“…[54,56,57,[60][61][62][63]. In this method, one can work with the eigenvectors and eigenvalues of the covariance (or Hessian) matrix.…”

Section: Error Propagation From Experimental Datamentioning

confidence: 99%

QCD analysis of nucleon structure functions in deep-inelastic neutrino-nucleon scattering: Laplace transform and Jacobi polynomials approach

Nejad

Khanpour

Tehrani³

et al. 2016

Phys. Rev. C

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We present a detailed QCD analysis of nucleon structure functions xF3(x, Q 2 ), based on Laplace transforms and Jacobi polynomials approach. The analysis corresponds to the next-to-leading order and next-to-next-to-leading order approximation of perturbative QCD. The Laplace transform technique, as an exact analytical solution, is used for the solution of nonsinglet Dokshitzer-GribovLipatov-Altarelli-Parisi evolution equations at low-and large-x values. The extracted results are used as input to obtain the x and Q 2 evolution of xF3(x, Q 2 ) structure functions using the Jacobi polynomials approach. In our work, the values of the typical QCD scale Λ (n f ) MSand the strong coupling constant αs(M 2 Z ) are determined for four quark flavors (n f = 4) as well. A careful estimation of the uncertainties shall be performed using the Hessian method for the valence-quark distributions, originating from the experimental errors. We compare our valence-quark parton distribution functions sets with those of other collaborations; in particular with the BBG, CT14, MMHT14 and NNPDF sets, which are contemporary with the present analysis. The obtained results from the analysis are in good agreement with those from the literature.

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Global analysis of nuclear parton distribution functions and their uncertainties at next-to-next-to-leading order

Cited by 113 publications

References 135 publications

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

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

Predictions for the Isolated Prompt Photon Production at the LHC ats= 13 TeV

QCD analysis of nucleon structure functions in deep-inelastic neutrino-nucleon scattering: Laplace transform and Jacobi polynomials approach

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