Dijet photoproduction at HERA and the structure of the photon

Chekanov, S.

doi:10.1007/s100520200936

Cited by 58 publications

(7 citation statements)

References 51 publications

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“…Here E i T and η i refer to the transverse energies and pseudorapidities of the jets, y is the inelasticity of the ep scattering and E e the energy of the electron beam. Figure 3 show comparisons between the ZEUS measurement [3] for the dijet photoproduction in ep collisions at HERA and the PYTHIA 8 simulation with direct-enhanced (x obs γ > 0.75) and resolvedenhanced (x obs γ < 0.75) event samples. The (sub-)leading jet were required to have E T > 14(11) GeV and the invariant mass of the photon-proton system were constrained to 134 < W γp < 277 GeV range.…”

Section: Dijet Photoproduction At Heramentioning

confidence: 99%

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Simulations of photo-nuclear dijets with PYTHIA 8 and their sensitivity to nuclear PDFs

Helenius¹

2018

Proceedings of XXVI International Workshop on Deep-Inelastic Scattering and Related Subjects — PoS(DIS2018)

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In ultra-peripheral heavy-ion collisions the nuclei pass with such a large impact parameter that no strong interaction can take place. However, a photon emitted by one nucleus can still interact either with the other nucleus or with a photon from the another nucleus. The former event type corresponds to photoproduction, earlier studied e.g. in electron-proton collisions at HERA, but now with a nuclear target. This provides an unique opportunity to study the nuclear modifications of the PDFs with the photo-nuclear processes measured in lead-lead collisions at the LHC. Here we present our recent implementation of photoproduction processes in the PYTHIA 8 generalpurpose Monte-Carlo event generator. The resulting simulations are compared to charged-hadron and dijet photoproduction data from the HERA experiments, and the theoretical uncertainties of the framework are studied. We discuss how the relevant part of the photon flux from heavy ions is obtained using the equivalent photon approximation and present predictions for photo-nuclear dijet cross section at the LHC. To estimate the potential of this data to further constrain the nuclear PDFs, the expected statistical uncertainty based on LHC luminosity is compared to uncertainties in the current nuclear PDF analyses.

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Section: Dijet Photoproduction At Heramentioning

confidence: 99%

“…Figure 3: Dijet photoproduction as a function of η jet2 for events with x obs γ < 0.75 (left) and x obs γ > 0.75 (right) with three different photon PDF set, CJKL (red) [4], GRV (green) [5] and SaSgam (orange) [6]. Data from ZEUS [3].…”

Section: Dijet Photoproduction At Heramentioning

confidence: 99%

Simulations of photo-nuclear dijets with PYTHIA 8 and their sensitivity to nuclear PDFs

Helenius¹

2018

Proceedings of XXVI International Workshop on Deep-Inelastic Scattering and Related Subjects — PoS(DIS2018)

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“…The energy and the position of the jet are next corrected for instrumental effects such as dead material and noncompensation. This jet energy scale (JES) correction is calculated using isolated jets 4 in the Monte Carlo simulation as a function of energy and pseudorapidity of the reconstructed jet. The JES correction factor ranges from about 2.1 for low-energy jets with p T ¼ 20 GeV in the central region jyj < 0:3 to less than 1.2 for high-energy jets in the most forward region 3:6 jyj < 4:4.…”

Section: Jet Reconstruction and Calibrationmentioning

confidence: 99%

“…They are an important tool for understanding the strong interaction and searching for physics beyond the standard model (see, for example, Refs. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]).…”

Section: Introductionmentioning

confidence: 99%

Measurement of inclusive jet and dijet production inppcollisions ats=7 TeVusing the ATLAS detector

Aad¹,

Abbott²,

Abdallah³

et al. 2012

Phys. Rev. D

154

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Inclusive jet and dijet cross sections have been measured in proton-proton collisions at a center-of-mass energy of 7 TeV using the ATLAS detector at the Large Hadron Collider. The cross sections were measured using jets clustered with the anti-k t algorithm with parameters R ¼ 0:4 and R ¼ 0:6. These measurements are based on the 2010 data sample, consisting of a total integrated luminosity of 37 pb À1. Inclusive jet double-differential cross sections are presented as a function of jet transverse momentum, in bins of jet rapidity. Dijet double-differential cross sections are studied as a function of the dijet invariant mass, in bins of half the rapidity separation of the two leading jets. The measurements are performed in the jet rapidity range jyj < 4:4, covering jet transverse momenta from 20 GeV to 1.5 TeV and dijet invariant masses from 70 GeV to 5 TeV. The data are compared to expectations based on next-to-leadingorder QCD calculations corrected for nonperturbative effects, as well as to next-to-leading-order Monte Carlo predictions. In addition to a test of the theory in a new kinematic regime, the data also provide sensitivity to parton distribution functions in a region where they are currently not wellconstrained.

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“…Provided that the jet transverse momenta p T are sufficiently large, this process allows one to probe the microscopic quark-gluon structure of the proton and the real photon in quantum chromodynamics (QCD) as well as the strong interaction dynamics in the regime of perturbative QCD (pQCD). The predictions of next-to-leading order (NLO) pQCD provide a good description of the dijet photoproduction cross section measured at HERA as a function of various jet observables in a wide range of p T [4,5,6,7]. This serves as an important test of the QCD factorization and universality of parton distribution functions (PDFs).…”

Section: Introductionmentioning

confidence: 99%

Inclusive and diffractive dijet photoproduction at the Electron-Ion Collider in NLO QCD

Guzey¹,

Klasen²

2023

Preprint

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In the framework of collinear factorization and next-to-leading order (NLO) perturbative QCD, we make predictions for inclusive and diffractive dijet photoproduction in electron-proton and electron-nucleus scattering in the EIC kinematics. We establish kinematic ranges in the pT , η, x obs A and x obs γ variables, quantify sensitivity to small-x nuclear PDFs, and analyze various scenarios of factorization breaking in the case of diffractive scattering.

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Dijet photoproduction at HERA and the structure of the photon

Cited by 58 publications

References 51 publications

Simulations of photo-nuclear dijets with PYTHIA 8 and their sensitivity to nuclear PDFs

Simulations of photo-nuclear dijets with PYTHIA 8 and their sensitivity to nuclear PDFs

Measurement of inclusive jet and dijet production inppcollisions ats=7 TeVusing the ATLAS detector

Inclusive and diffractive dijet photoproduction at the Electron-Ion Collider in NLO QCD

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