Measurement of deeply virtual Compton scattering at HERA

Adloff, C.; Andreev, V.; Andrieu, Bernard; Anthonis, T.; Arkadov, V.; Astvatsatourov, A.; Babaev, A.; Bähr, J.; Baranov, P.; Barrelet, E.; Bartel, W.; Bate, Pete S.; Beglarian, A.; Behnke, O.; Beier, C.; Belousov, A.; Benisch, T.; Berger, Ch.; Berndt, T.; Bizot, J.C.; Boudry, V.; Braunschweig, W.; Brisson, V.; Bröker, H.-B.; Brown, D.; Brückner, W.; Bruncko, D.; Bürger, J.; Büsser, F.W.; Bunyatyan, A.; Burrage, A.; Buschhorn, G.; Bystritskaya, L.; Campbell, A.; Cao, Junpeng; Caron, S.; Clarke, D.; Clerbaux, B.; Collard, C.; Contreras, J. G.; Coppens, Y.R.; Coughlan, J. A.; Cousinou, M. C.; Cox, B. E.; Cozzika, G.; Cvach, J.; Dainton, J. B.; Dau, W.D.; Daum, K.; Davidsson, Marcus; Delcourt, B.; Delerue, Nicolas; Demirchyan, R.; Roeck, A. De; Wolf, E. A. De; Diaconu, C.; Dingfelder, J.; Dixon, P.; Dodonov, V.; Dowell, J. D.; Droutskoi, A.; Dubak, A.; Duprel, C.; Eckerlin, G.; Eckstein, D.; Efremenko, V.; Egli, S.; Eichler, R.; Eisele, F.; Eisenhandler, E.; Ellerbrock, M.; Elsen, E.; Erdmann, M.; Erdmann, W.; Faulkner, Peter; Favart, L.; Fedotov, A.; Felst, R.; Ferencei, J.; Ferron, S.; Fleischer, M.; Fleming, Y.H.; Flügge, G.; Fomenko, A.; Foresti, I.; Formánek, J.; Foster, J. M.; Franke, G.; Gabathuler, E.; Gabathuler, K.; Garvey, J.; Gassner, J.; Gayler, J.; Gerhards, R.; Gerlich, C.; Ghazaryan, S.; Goerlich, L.; Gogitidze, N.; Goldberg, M.; Goodwin, Christopher J.; Grab, C.; Grässler, H.; Greenshaw, T.; Grindhammer, G.; Hadig, T.; Haidt, D.; Hajduk, L.; Haynes, W.J.; Heinemann, B.; Heinzelmann, G.; Henderson, R. C. W.; Hengstmann, S.; Henschel, H.; Heremans, R.; Herrera, G.; Herynek, I.; Hildebrandt, M.; Hilgers, M.; Hiller, K. H.; Hladký, J.; Höting, P.; Hoffmann, D.; Horisberger, R.; Hurling, S.; Ibbotson, M.; İşsever, Ç.; Jacquet, M.; Jaffré, M.; Janauschek, L.; Janssen, X.; Jemanov, V.; Jönsson, L.; Johnson, D.P.; Jones, M.; Jung, H.; Kästli, H.K.; Kant, D.; Kapichine, M.; Karlsson, Martin; Karschnick, O.; Keil, Frerich J.; Keller, N.; Kennedy, J.; Kenyon, I. R.; Kermiche, S.; Kiesling, C.; Kjellberg, P.; Klein, M.; Kleinwort, C.; Kluge, T.; Knies, G.; Koblitz, B.; Kolya, S. D.; Korbel, V.; Kostka, P.; Kotelnikov, S.K.; Koutouev, R.; Koutov, A.; Krehbiel, H.; Kroseberg, J.; Krüger, K.; Küpper, A.; Kuhr, T.; Kurča, T.; Lahmann, R.; Lamb, David C.; Landon, M. P. J.; Lange, W.; Laštovička, T.; Laycock, P.; Lebailly, E.; Lebedev, A.; Leißner, B.; Lemrani, R.; Lendermann, V.; Levonian, S.; Lindstroem, M.; List, B.; Lobodzinska, E.; Łobodziński, B.; Loginov, A.; Loktionova, N.; Lubimov, V.; Lüders, S.; Lüke, D.; Lytkin, L.; Mahlke-Krüger, H.; Malden, N.; Malinovski, E.; Malinovski, I.; Maraček, R.; Marage, P.; Marks, J.; Marshall, R.; Martyn, H. U.; Martyniak, J.; Maxfield, S. J.; Meer, D.; Mehta, A.; Meier, K.; Meyer, Andreas Bernhard; Meyer, H.; Meyer, J.; Meyer, P.-O.; Mikocki, S.; Milstead, D.; Mkrtchyan, T.; Mohr, R. Casanova; Mohrdieck, S.; Mondragón, M. N.; Moreau, F.; Morozov, A.; Morris, J. V.; Müller, K.; Мурін, П.; Nagovizin, V.; Naroska, B.; Naumann, J.; Naumann, T.; Nellen, G.; Newman, P. R.; Nicholls, T. C.; Niebergall, F.; Niebuhr, C.; Nix, O.; Nowak, G.; Olsson, J. E.; Ozerov, D.; Panassik, V.; Pascaud, C.; Patel, G. D.; Peez, M.; Pérez, E.; Phillips, J. P.; Pitzl, D.; Pöschl, R.; Potachnikova, I.; Povh, Bogdan; Rabbertz, K.; Rädel, G.; Rauschenberger, J.; Reimer, P.; Reisert, B.; Reyna, D.; Risler, C.; Rizvi, E.; Robmann, P.; Roosen, R.; Rostovtsev, A.; Rusakov, S. V.; Rybicki, K.; Sankey, D. P. C.; Scheins, J.; Schilling, F.-P.; Schleper, P.; Schmidt, D.; Schmidt, S.; Schmitt, S.; Schneider, M.; Schoeffel, L.; Schöning, A.; Schörner, T.; Schröder, V.; Schultz-Coulon, Hans-Christian; Schwanenberger, C.; Sedlák, Kamil; Sefkow, F.; Shekelyan, V.; Sheviakov, I.; Shtarkov, L. N.; Sirois, Y.; Sloan, T.; Smirnov, P.; Soloviev, Y.; South, D.; Spaskov, V.; Specka, A.; Spitzer, H.; Stamen, R.; Stella, B.; Stiewe, J.; Straumann, U.; Swart, M.; Taševský, M.; Tchernyshov, V.; Tchetchelnitski, S.; Thompson, G.; Thompson, P. D.; Tobien, N.; Traynor, D.; Truöl, P.; Tsipolitis, G.; Tsurin, I.; Turnau, J.; Turney, J.E.; Tzamariudaki, E.; Udluft, Steffen; Urban, M.; Usik, A.; Valkár, Š.; Valkárová, A.; Vallée, Claude; Mechelen, P. Van; Vassiliev, S.; Vazdik, Y.; Vichnevski, A.; Wacker, K.; Wallny, R.; Waugh, Benedict Martin; Weber, G.; Weber, M.; Wegener, D.; Werner, C.; Werner, M.; Werner, N.; White, G.; Wiesand, S.; Wilksen, T.; Winde, M.; Winter, G. G.; Wissing, C.; Wobisch, M.; Wünsch, E.; Wyatt, A.; Žáček, J.; Zálešâk, J.; Zhang, Z.; Zhokin, A.; Zomer, F.; Zsembery, J.; Nedden, M. zur

doi:10.1016/s0370-2693(01)00939-x

Cited by 184 publications

(142 citation statements)

References 31 publications

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“…[10] in section VII. We will now define various DVCS observables, in terms of a list of asymmetries in the azimuthal angle φ:…”

Section: B Dvcs Observables: Differential Cross Section and Asymmetriesmentioning

confidence: 99%

“…H1 recently published their data [10] on the measured DVCS cross section on both the lepton level and the photon level. They use the equivalent photon approach, which relates the pure DVCS cross section on the lepton level (with the interference neglected 21 and the pure BH term subtracted) to the virtual-photon proton cross section:…”

Section: Comparison With Experiments and Other Calculationsmentioning

confidence: 99%

“…The hard scale required for a perturbative analysis is either provided by the spacelike virtuality, Q 2 = −q 2 Λ 2 QCD , of the exchanged photon, a heavy quark mass, or by a large momentum transfer to the hadron in the t-channel, t 0. Deeply virtual Compton scattering (DVCS) [1][2][3][4][5][6][7][8][9][10][11][12][13], γ * (q) + p(P ) → γ(q ) + p(P ), is the most promising 1 of these processes. One reason for this is that on the lepton level it interferes with a competing QED process, known as the Bethe-Heitler (BH) process, in which the final state photon is radiated from either the initial or final state lepton.…”

Section: Introductionmentioning

confidence: 99%

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A detailed next-to-leading order QCD analysis of deeply virtual Compton scattering observables

2002

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We present a detailed next-to-leading order (NLO) leading twist QCD analysis of deeply virtual Compton scattering (DVCS) observables, for several different input scenarios, in the MS scheme. We discuss the size of the NLO effects and the behavior of the observables in skewedness ζ, momentum transfer, t, and photon virtuality, q 2 = −Q 2 . We present results on the amplitude level for unpolarized and longitudinally polarized lepton probes, and unpolarized and longitudinally polarized proton targets. We make predictions for various asymmetries and for the DVCS cross section and compare with the available data.

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“…[10] in section VII. We will now define various DVCS observables, in terms of a list of asymmetries in the azimuthal angle φ:…”

Section: B Dvcs Observables: Differential Cross Section and Asymmetriesmentioning

confidence: 99%

Section: Comparison With Experiments and Other Calculationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A detailed next-to-leading order QCD analysis of deeply virtual Compton scattering observables

2002

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“…II (from H1 Coll. paper [3]) one compares their prediction with the existing measurement from H1 and ZEUS Collaborations [1][2][3]. The color dipole prediction from Donnachie-Dosh [11] is also presented for the sake of comparison.…”

Section: Cross Section Comparison To Datamentioning

confidence: 99%

“…In these cases, the difference with the inclusive case is the longitudinal components of the incoming and outgoing proton momentum, which depend on the photon virtuality Q 2 and the γ * p center of mass energy W . The recent data from DESY ep collider HERA on exclusive diffractive virtual Compton process [1][2][3] at large Q 2 becomes an important source to study the partons, in particular gluon, inside the proton for non-forward kinematics and its relation with the forward one (see Fig. I).…”

Section: Introductionmentioning

confidence: 99%

Deeply virtual compton scattering in color dipole formalism

Machado¹

2007

Braz. J. Phys.

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In this contribution we summarize recent investigations on the deeply virtual Compton Scattering (DVCS) within the color dipole approach. The color dipole cross section is implemented through the phenomenological saturation model. The role played by its QCD evolution and skewedness effects in the DVCS cross section are discussed. The results are compared with the recent H1 and ZEUS Collaborations data. The skewing factor, defined as the ratio of the imaginary parts of the amplitudes Im A(γ * p → γ * p)/Im A(γ * p → γ p) can be extracted from the data using recent DVCS and the inclusive inelastic cross section measurements at DESY-HERA. We report on this experimental extraction and compare the results to the theoretical predictions for NLO QCD and the color dipole approach.

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