An NLO calculation of the electroproduction of large-E $_{\bot}$ hadrons

We analyze the order 2 s corrections to the single inclusive jet cross section in lepton-nucleon deep inelastic scattering. The full calculation is done analytically, in the small cone approximation, obtaining finite NLO partonic level cross sections for these processes. A detailed study of the different underlying partonic reactions is presented focusing in the size of the corrections they get at NLO accuracy, their relative weight, and the residual scale uncertainty they leave in the full cross section depending on the kinematical region explored. In agreement with what has already been found in forward production of 0 , we show that the dominant partonic process in very forward jet production is found to start at order 2 s , being effectively a lowest order estimate, with the consequent large factorization scale uncertainty, and the likelihood of non-negligible corrections at the subsequent order in perturbation theory.

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“…Indeed, the NLO approximation, which takes into account these contributions, reproduce nicely the data [5][6][7].…”

Section: Introductionsupporting

confidence: 57%

Order(αs2)QCD corrections to inclusive jet production in deep inelastic scattering

Daleo

Sassot

2006

Phys. Rev. D

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“…Calculations based on the modified BFKL equation clearly exceed the data in the two highest Q 2 intervals. The prediction of the NLO calculation [34] is also shown and describes the data well. Predictions of the CDM (not shown) overestimate the data at the lowest values of Q 2 and x.…”

Section: Inclusive Forward π • Cross Sectionsmentioning

confidence: 81%

“…Recently, calculations of the cross section for the production of high transverse momentum hadrons in DIS interactions have been made [34], which describe earlier measurements of forward π…”

Section: Predictions Of the πmentioning

confidence: 99%

“…For comparison with the H1 data, the renormalisation, factorisation and fragmentation scales are each set to (Q 2 + p * 2 T,π )/2, where p * T,π is the transverse momentum, in the photon-proton centre of mass system 1 , of the parton which fragments into the forward π • . In these calculations, a large part of the cross section is generated by higher order contributions which correspond to lowest order BFKL and resolved photon processes [34].…”

Section: Predictions Of the πmentioning

confidence: 99%

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Forward $\pi^\circ$ production and associated transverse energy flow in deep-inelastic scattering at HERA

2004

Eur. Phys. J. C

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Deep-inelastic positron-proton interactions at low values of Bjorken-x down to x ≈ 4 · 10 −5 which give rise to high transverse momentum π • -mesons are studied with the H1 experiment at HERA. The inclusive cross section for π • -mesons produced at small angles with respect to the proton remnant (the forward region) is presented as a function of the transverse momentum and energy of the π • and of the four-momentum transfer Q 2 and Bjorken-x. Measurements are also presented of the transverse energy flow in events containing a forward π • -meson. Hadronic final state calculations based on QCD models implementing different parton evolution schemes are confronted with the data.

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“…All the components are calculated at NLO and details can be found in Ref. [13]. We work in the MS scheme for factorisation and renormalisation with The shapes of the curves corresponding to the small domain 10 < Q 2 < 30 GeV 2 (red curves) and to 10 < Q 2 < 350 GeV 2 are similar, but the curves of the small Q 2 -domain are a factor 2-3 smaller than those of the full Q 2 range.…”

Section: Introductionmentioning

confidence: 99%

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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An NLO calculation of the electroproduction of large-E $_{\bot}$ hadrons

Cited by 26 publications

References 27 publications

Order(αs2)QCD corrections to inclusive jet production in deep inelastic scattering

Order(αs2)QCD corrections to inclusive jet production in deep inelastic scattering

Forward $\pi^\circ$ production and associated transverse energy flow in deep-inelastic scattering at HERA

Photon–jet correlations in deep-inelastic scattering

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