Revisiting the deep Compton effect

Fontannaz, M.; Schiff, D.

doi:10.1007/bf01495035

Cited by 8 publications

(9 citation statements)

References 17 publications

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“…2͒. 4 As well as the above full NLO set, we will include two terms of order ␣ em 2 ␣ s 2 ͑formally from the NNLO set͒: the double resolved contributions 5 ͑Fig. 3͒ and the direct diagram ͑box͒ ␥g→␥g ͓24͔ ͑Fig.…”

Section: B the Cross Sectionmentioning

confidence: 99%

Photoproduction of the isolated photon at DESY HERA in next-to-leading order QCD

Zembrzuski

Krawczyk

2001

Phys. Rev. D

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The next-to-leading order ͑NLO͒ QCD calculation for the photoproduction of an isolated photon with a large p T at the ep collider DESY HERA is presented. The single resolved photon contribution and the QCD corrections of order ␣ s to the Born term are consistently included. The NNLO contributions, the box and double resolved photon subprocesses, are sizable and are taken into account in addition. The importance of the isolation cut as well as the influence of other experimental cuts on the p T and ␥ ͑the final photon rapidity͒ distributions are discussed in detail. An investigation of the renormalization scale dependence is performed in order to estimate the size of missing higher order QCD corrections. The results are compared with experimental data and with the prediction of a different NLO calculation.

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Section: B the Cross Sectionmentioning

confidence: 99%

Photoproduction of the isolated photon at DESY HERA in next-to-leading order QCD

Zembrzuski

Krawczyk

2001

Phys. Rev. D

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“…The matrix elements for these NLO corrections have been taken from the literature [21,22,23]. We also included the box contribution gγ → gγ, which is formally NNLO, but known to be sizeable [24,25]. It is well known that at NLO the attribution of certain finite terms to either of the four categories listed above is scheme dependent and therefore only the sum of all parts has a physical meaning.…”

Section: General Settingmentioning

confidence: 99%

Is a large intrinsic $k_{\mathrm{T}}$ needed to describe photon + jet photoproduction at HERA?

2001

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“…both the initial and the final photon resolved (figs. 2,3). They correspond to partonic cross sections of orders [α em α s ] (single resolved) and [α 2 s ] (double resolved).…”

Section: Discussionmentioning

confidence: 99%

“…In the present calculation we include in LL accuracy the single and double resolved photon processes as well as the box diagram in addition to the Born contribution, see also [3][4][5]9 (although this is not fully consistent with the discussion in sec. 2).…”

Section: The Comparison Of Nlo and Ll Predictionsmentioning

confidence: 92%

“…By expressing ln(Q 2 /Λ 2 QCD ) as ∼ 1/α s one treats the parton densities in photon (and parton fragmentation into the photon) as proportional to α em /α s (see e.g. [3]- [5], [8,9], [15]- [17] and [21,22] ). By applying this method to the DIC process, we see that the single resolved photon contribution to the cross section for the process γp → γX becomes of the same order as the Born term.The same is also observed for the double resolved photon contribution.…”

Section: The Nlo Calculation For γP → γX -General Discussionmentioning

confidence: 99%

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Photoproduction of isolated photons at HERA in NLO QCD

Krawczyk¹

2002

J. Phys. G: Nucl. Part. Phys.

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Abstract.The NLO QCD calculation for the photoproduction of the isolated photon with a large p T at the HERA ep collider is presented. The single resolved photon contribution and the QCD corrections of order α s to the Born term are consistently included. The sizeable NNLO contributions, the box and the double resolved photon subprocesses, are taken into account in addition. The importance of the isolation cut, as well as the influence of other experimental cuts on the p T and η γ distributions are discussed in detail. Results are compared with experimental data and with the different NLO calculations.

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Revisiting the deep Compton effect

Cited by 8 publications

References 17 publications

Photoproduction of the isolated photon at DESY HERA in next-to-leading order QCD

Photoproduction of the isolated photon at DESY HERA in next-to-leading order QCD

Is a large intrinsic $k_{\mathrm{T}}$ needed to describe photon + jet photoproduction at HERA?

Photoproduction of isolated photons at HERA in NLO QCD

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