Photon–jet cross sections in deep-inelastic scattering

Aurenche, P.; Fontannaz, M.

doi:10.1140/epjc/s10052-015-3296-x

Cited by 7 publications

(11 citation statements)

References 26 publications

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“…Both theories described the shapes of the single-particle cross sections well, but failed to reproduce the normalisation of the data. A later version of the original AFG calculation agreed well with the results [56], and has been used in the present study.…”

Section: Jhep01(2018)032supporting

confidence: 71%

Further studies of isolated photon production with a jet in deep inelastic scattering at HERA

Abramowicz

Abt

Adamczyk

et al. 2018

J. High Energ. Phys.

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Isolated photons with high transverse energy have been studied in deep inelastic ep scattering with the ZEUS detector at HERA, using an integrated luminosity of 326 pb −1 in the range of exchanged-photon virtuality 10-350 GeV 2 . Outgoing isolated photons with transverse energy 4 < E γ T < 15 GeV and pseudorapidity −0.7 < η γ < 0.9 were measured with accompanying jets having transverse energy and pseudorapidity 2.5 < E jet T < 35 GeV and −1.5 < η jet < 1.8, respectively. Differential cross sections are presented for the following variables: the fraction of the incoming photon energy and momentum that is transferred to the outgoing photon and the leading jet; the fraction of the incoming proton energy transferred to the photon and leading jet; the differences in azimuthal angle and pseudorapidity between the outgoing photon and the leading jet and between the outgoing photon and the scattered electron. Comparisons are made with theoretical predictions: a leading-logarithm Monte Carlo simulation, a next-to-leading-order QCD prediction, and a prediction using the k T -factorisation approach.

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Section: Jhep01(2018)032supporting

confidence: 71%

Further studies of isolated photon production with a jet in deep inelastic scattering at HERA

Abramowicz

Abt

Adamczyk

et al. 2018

J. High Energ. Phys.

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“…After the rescaling Pythia MC shows a good agreement in shape with the data. The cross sections are additionaly compared to two theory models on the whole Q 2 range: the model of Baranov et al, [15], in which unintegrated parton densities are used in a LO QCD framework, see Fig.6 and a NLO QCD calculation of Aurenche, Fontannaz and Guillet (AFG) [13,14] . The uncertainties for the AFG predictions are set to 10% arrising from the QCD scale at this…”

Section: Discussionmentioning

confidence: 99%

Combined Variables in Isolated Photon Production in Deep Inelastic Scattering at HERA

Hlushchenko¹

2017

Proceedings of XXV International Workshop on Deep-Inelastic Scattering and Related Subjects — PoS(DIS2017)

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Isolated photons with high transverse energy have been studied in ep deep inelastic scattering with the ZEUS detector at HERA, using and integrated luminosity of 326 pb −1 . The kinematic region includes photon virtualities 10 < Q 2 < 350 GeV 2 . Photons with transverse energy 4 < E T γ < 15GeV and pseudorapidity 0.7 < η γ < 0.9 were measured with accompanying jets having transverse energy and pseudorapidity 2.5 < E T jet < 35 GeV and 1.5 < η jet < 1.8. Differential cross sections are presented for several different correlated variables: the fraction of the incoming photon energy and momentum that is transferred to the photon and the jet, the fraction of proton energy taken by the parton that interacts with the photon, the azimuthal angle and the pseudorapidity difference between the prompt photon and the jet and between the prompt photon and the scattered electron. Comparisons with different theoretical calculations are made.

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“…As in Ref. [1] we adopt the ZEUS kinematics [7] with √ s = 319 GeV; the photon momentum has to lie in the ranges 4 < p γ ⊥ < 15 GeV and −0.7 < η γ < 0.9. For the jet momentum we have 2.5 < p jet ⊥ < 35 GeV and −1.5 < η jet < 1.8.…”

Section: Introductionmentioning

confidence: 99%

“…These two effects explain the weak sensitivity of dσ/dx γ to E * ⊥cut for x γ 0.7. Like- 1 The Born direct contribution corresponds to x γ = 1.…”

Section: Introductionmentioning

confidence: 99%

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Photon–jet correlations in deep-inelastic scattering

Aurenche

Fontannaz

2017

Eur. Phys. J. C

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The reaction e + p → γ + jet + X is studied in QCD at the next-to-leading order. Previous studies on inclusive distributions showed good agreement with ZEUS data. To obtain a finer understanding of the dynamics of the reaction, several correlation functions are evaluated for ZEUS kinematics.This note is the continuation of the study of the deep inelastic scattering (DIS) reaction e + p → γ + jet + X with a photon and a jet in the final state. In a preceding paper [1] we calculated the next-to-leading order (NLO) QCD cross sections describing the photoproduction of a large-p ⊥ photon ( p γ ⊥ , η γ ) accompanied by a jet. In particular, we calculated the transverse momentum and rapidity distributions of the photon with the jet constrained in a given large range as well as the jet transverse momentum spectrum in events with a detected photon. In the present note we concentrate on the distributions in the following correlation variables:p ) (in the laboratory frame E e , E p are respectively the incident energies of the electron and the proton and y is the DIS inelasticity), η = η γ − η jet and φ = φ electron −φ γ . Note thatx p , as defined above, does not correspond to x p , the fraction of momentum carried by a parton in the proton, since we are not in a collinear frame. The correlations should provide a finer understanding of the underlying production mechanism than the inclusive cross sections.Originally the NLO calculation [2,3] was performed in the γ * − p center of mass (γ * is the virtual photon) in which a large scale is provided by a large value of p * γ ⊥ , the final γ transverse momentum in that frame. Production cross sections of hadrons and jets were studied in this frame and successfully described by the NLO calculation [4][5][6]. On the other hand, in the ZEUS experiment [7] the reaction e + p → γ + jet + X is studied in the laboratory frame for a

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Photon–jet cross sections in deep-inelastic scattering

Cited by 7 publications

References 26 publications

Further studies of isolated photon production with a jet in deep inelastic scattering at HERA

Further studies of isolated photon production with a jet in deep inelastic scattering at HERA

Combined Variables in Isolated Photon Production in Deep Inelastic Scattering at HERA

Photon–jet correlations in deep-inelastic scattering

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