Deep inelastic scattering events with a large rapidity gap at HERA

Ahmed, T.; Aïd, S.; Andreev, V.; Andrieu, Bernard; Appuhn, R. D.; Arpagaus, M.; Babaev, A.; Baehr, J.; Bán, J.; Baranov, P.; Barrelet, E.; Bartel, W.; Barth, M.; Bassler, U.; Beck, H. P.; Behrend, H. J.; Belousov, A.; Berger, Ch.; Bergstein, H.; Bernardi, G.; Bernet, R.; Bertrand-Coremans, G.; Besançon, M.; Biddulph, P.; Bizot, J.C.; Blobel, V.; Borras, K.; Botterweck, F.; Boudry, V.; Braemer, A.; Brasse, F.W.; Braunschweig, W.; Brisson, V.; Bruncko, D.; Brune, C. R.; Buchholz, R.; Büngener, L.; Bürger, J.; Büsser, F.W.; Buniatian, A.; Bürke, S.; Buschhorn, G.; Campbell, A. J.; Carli, T.; Charles, F.; Clarke, D.; Clegg, A.B.; Clerbaux, B.; Colombo, M.; Contreras, J. G.; Coughlan, J. A.; Courau, A.; Coutures, C.; Cozzika, G.; Criegee, L.; Cussans, D.; Cvach, J.; Dagoret, S.; Deffur, E.; Delcourt, B.; Buono, L. Del; Roeck, A. De; Wolf, E. A. De; Nezza, P. Di; Dollfus, C.; Dowell, J. D.; Dreis, H. B.; Duboc, J.; Düllmann, D.; Dünger, O.; Duhm, H.H.; Ebert, J.; Ebert, T. R.; Eckerlin, G.; Efremenko, V.; Egli, S.; Ehrlichmann, H.; Eichenberger, S.; Eichler, R.; Eisele, F.; Eisenhandler, E.; Ellison, R. J.; Elsen, E.; Erdmann, M.; Evrard, E.; Favart, L.; Fedotov, A.; Feeken, D.; Felst, R.; Feltesse, J.; Ferencei, J.; Ferrarotto, F.; Flamm, K.; Fleischer, M.; Flieser, M.; Flügge, G.; Fomenko, A.; Fominykh, B.; Forbush, M.; Formánek, J.; Foster, J. M.; Franke, G.; Fretwurst, E.; Gabathuler, E.; Gabathuler, K.; Gamerdinger, K.; Garvey, J.; Gayler, J.; Gebauer, M.; Gellrich, A.; Genzel, H.; Gerhards, R.; Goerlach, U.; Goerlich, L.; Gogitidze, N.; Goldberg, M.; Goldner, D.; González-Pineiro, B.; Goodall, A. M.; Gorelov, I.; Goritchev, P.; Grab, C.; Grässler, H.; Grässler, R.; Greenshaw, T.; Grindhammer, G.; Gruber, A.; Grüber, C.; Haack, J.; Haidt, D.; Hajduk, L.; Hamon, O.; Hampel, Matías Rolf; Hanlon, E. M.; Hapke, M.; Haynes, W.J.; Heaterington, J.; Hedberg, V.; Heinzelmann, G.; Henderson, R. C. W.; Henschel, H.; Herma, R.; Herynek, I.; Heß, M.; Hildesheim, W.; Hill, P.; Hiller, K. H.; Hilton, C.D.; Hladký, J.; Hoeger, K. C.; Höppner, M.; Horisberger, R.; Huet, Ph.; Hufnagel, H.; Ibbotson, M.; Itterbeck, H.; Jabiol, M. A.; Jachołkowska, A.; Jacobsson, C.; Jaffré, M.; Janoth, J.; Jansen, Thomas L. C.; Jönsson, L.; Johannsen, K.; Johnson, D.P.; Johnson, L.; Jung, H.; Kalmus, P. I. P.; Kant, D.; Kaschowitz, R.; Kasselmann, P.; Kathage, U.; Kaufmann, H. H.; Kazarian, Shahé S.; Kenyon, I. R.; Kermiche, S.; Keuker, C.; Kiesling, C.; Klein, M.; Kleinwort, C.; Knies, G.; Ko, W.; Köhler, Thomas; Kolanoski, H.; Kole, F.; Kolya, S. D.; Korbel, V.; Korn, M.; Kostka, P.; Kotelnikov, S.K.; Krasny, M. W.; Krehbiel, H.; Krücker, D.; Krüger, U.; Krüner-Marquis, U.; Kubenka, J. P.; Küster, H.; Kuhlen, M.; Kurča, T.; Kurzhöfer, J.; Кузник, Б. И.; Lacour, D.; Lamarche, F.; Lander, R.; Landon, M. P. J.; Lange, W.; Lanius, P.; Laporte, J. F.; Lebedev, A.; Leverenz, C.; Levonian, S.; Ley, Ch.; Lindner, A.; Lindström, G.; Linsel, F.; Lipiński, J.; List, B.; Loch, P.; Lohmander, H.; Lopez, G. C.; Lüke, D.; Magnussen, N.; Malinovski, E.; Mani, S.; Maraček, R.; Marage, P.; Marks, J.; Marshall, R.; Martens, J.; Martin, R.; Martyn, H. U.; Martyniak, J.; Masson, S.; Mavroidis, T.; Maxfield, S. J.; McMahon, S. J.; Mehta, A.; Meier, K.; Mercer, D.; Merz, T.; Meyer, Chris; Meyer, H.; Meyer, J.; Mikocki, S.; Milstead, D.; Moreau, F.; Morris, J. V.; Müller, G.; Müller, K.; Мурін, П.; Nagovizin, V.; Nahnhauer, R.; Naroska, B.; Naumann, T.; Newman, P. R.; Newton, D.; Neyret, D.; Nguyen, H. K.; Niebergall, F.; Niebuhr, C.; Nisius, R.; Nowak, G.; Noyes, G. W.; Nyberg-Werther, M.; Oberlack, H.; Obrock, U.; Olsson, J. E.; Panaro, E.; Panitch, A.; Pascaud, C.; Patel, G. D.; Peppel, E.; Pérez, E.; Phillips, J. P.; Pichler, Ch.; Pitzl, D.; Pope, G.; Prell, S.; Prosi, R.; Rädel, G.; Raupach, F.; Reimer, P.; Reinshagen, S.; Ribarics, P.; Riech, V.; Riedlberger, J.; Rieß, S.; Rietz, M.; Robertson, S.; Robmann, P.; Roloff, H. E.; Roosen, R.; Rosenbauer, K.; Rostovtsev, A.; Rouse, F.; Royon, C.; Rüter, K.; Rusakov, S. V.; Rybicki, K.; Ryłko, R.; Sahlmann, N.; Sánchez, E.; Sankey, D. P. C.; Savitsky, M.; Schacht, P.; Schiek, S.; Schleper, P.; Schlippe, W. von; Schmidt, C.; Schmidt, D.; Schmidt, G.; Schöning, A.; Schröder, V.; Schuhmann, E.; Schwab, B.; Schwind, A.; Seehausen, U.; Sefkow, F.; Seidel, M.; Sell, Raivo; Semenov, A.; Shekelyan, V.; Sheviakov, I.; Shooshtari, H.; Shtarkov, L. N.; Siegmon, G.; Siewert, U.; Sirois, Y.; Skillicorn, I. O.; Smirnov, P.; Smith, Jack; Soloviev, Y.; Spitzer, H.; Starosta, R.; Steenbock, M.; Steffen, P.; Steinberg, R.; Stella, B.; Stephens, K.; Stier, J.; Stiewe, J.; Stößlein, U.; Strachota, J.; Straumann, U.; Struczinski, W.; Sutton, J. P.; Tapprogge, S.; Taylor, Richard E.; Tchernyshov, V.; Thiebaux, Ch; Thompson, G.; Tichomirov, I.; Truöl, P.; Turnau, J.; Tutas, J.; Uelkes, P.; Usik, A.; Valkár, Š.; Valkárová, A.; Vallée, C.; Esch, Patrick van; Mechelen, P. Van; Vartapetian, A.; Vazdik, Y.; Vecko, M.; Verrecchia, P.; Villet, G.; Wacker, K.; Wagener, Aurélie; Walker, I. W.; Walther, A.; Weber, G.; Weber, M.; Wegener, D.; Wegner, A.; Wellisch, H. P.; West, L.R.; Willard, S.; Winde, M.; Winter, G. G.; Wolff, Th.; Wright, Alison; Wünsch, E.; Wulff, N.; Yiou, T. P.; Žáček, J.; Zhang, Z.; Zimmer, M.; Zimmermann, W.; Zomer, F.; Zuber, Κ.

doi:10.1016/0550-3213(94)90151-1

Cited by 166 publications

(39 citation statements)

References 30 publications

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“…Such correlations are odd under time reversal, and thus they can arise in a time-reversal invariant theory only when there is a phase difference between different spin amplitudes. Specifically, a nonzero correlation of the proton spin normal to a production plane measures the phase difference between two amplitudes coupling the proton target with J The observation that ≃ 10% of the positron-proton deep inelastic cross section at HERA is diffractive [77,78] points to the importance of final-state gauge interactions as well as a new perspective to the nature of the hard pomeron. The same interactions are responsible for nuclear shadowing and Sivers-type single-spin asymmetries in semiinclusive deep inelastic scattering and in Drell-Yan reactions.…”

Section: Complications From Final-state Interactionsmentioning

confidence: 99%

New Results in Light-Front Phenomenology

Brodsky¹

2004

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The light-front quantization of gauge theories in light-cone gauge provides a frameindependent wavefunction representation of relativistic bound states, simple forms for current matrix elements, explicit unitarity, and a trivial vacuum. In this talk I review the theoretical methods and constraints which can be used to determine these central elements of QCD phenomenology. The freedom to choose the light-like quantization four-vector provides an explicitly covariant formulation of light-front quantization and can be used to determine the analytic structure of light-front wave functions and define a kinematical definition of angular momentum. The AdS/CFT correspondence of large N C supergravity theory in higher-dimensional anti-de Sitter space with supersymmetric QCD in 4-dimensional space-time has interesting implications for hadron phenomenology in the conformal limit, including an all-orders demonstration of counting rules for exclusive processes. String/gauge duality also predicts the QCD power-law behavior of light-front Fock-state hadronic wavefunctions with arbitrary orbital angular momentum at high momentum transfer. The form of these nearconformal wavefunctions can be used as an initial ansatz for a variational treatment of the light-front QCD Hamiltonian. The light-front Fock-state wavefunctions encode the bound state properties of hadrons in terms of their quark and gluon degrees of freedom at the amplitude level. The nonperturbative Fock state wavefunctions contain intrinsic gluons, and sea quarks at any scale Q with asymmetries such as s(x) =s(x),ū(x) =d(x). Intrinsic charm and bottom quarks appear at large x in the light-front wavefunctions since this minimizes the invariant mass and off-shellness of the higher Fock state. In the case of nuclei, the Fock state expansion contains "hidden color" states which cannot be classified in terms of nucleonic degrees of freedom. I also briefly review recent analyses which shows that some leading-twist phenomena such as the diffractive component of deep inelastic scattering, single-spin asymmetries, nuclear shadowing and antishadowing cannot be computed from the LFWFs of hadrons in isolation.2

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Section: Complications From Final-state Interactionsmentioning

confidence: 99%

New Results in Light-Front Phenomenology

Brodsky¹

2004

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“…where P Y is the 4-momentum of system Y , W 2 = (q + P ) 2 is the squared centre of mass energy of the virtual photonproton system and m P is the proton mass. The variable x P is the fractional momentum loss of the incident proton.…”

Section: Diffractive Dis Kinematics Variables and Observablesmentioning

confidence: 99%

“…At HERA a substantial fraction of up to 10 % of ep interactions proceed via the diffractive scattering process initiated by a highly virtual photon [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. In contrast to the standard deep inelastic scattering (DIS) process ep → eX (Fig.…”

Section: Introductionmentioning

confidence: 99%

Inclusive measurement of diffractive deep-inelastic scattering at HERA

Aaron¹,

Alexa²,

Andreev³

et al. 2012

Eur. Phys. J. C

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The diffractive process ep → eXY , where Y denotes a proton or its low mass excitation with M Y < 1.6 GeV, is studied with the H1 experiment at HERA. The analysis is restricted to the phase space region of the photon virtuality 3 ≤ Q 2 ≤ 1600 GeV 2 , the square of the fourmomentum transfer at the proton vertex |t| < 1. Triple differential cross sections are measured as a function of x P , Q 2 and β = x/x P where x is the Bjorken scaling variable. These measurements are made after selecting diffractive events by demanding a large empty rapidity interval separating the final state hadronic systems X and Y . large rapidity gap selection method. The combined data represent a factor between three and thirty increase in statistics with respect to the previously published results. The measurements are compared with predictions from NLO QCD calculations based on diffractive parton densities and from a dipole model. The proton vertex factorisation hypothesis is tested.

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“…Diffractive production of hadrons in deep inelastic scattering has been observed in experiments at HERA [2,3]. The gluonic content of the Pomeron is poorly known.…”

Section: Introductionmentioning

confidence: 99%

Charm production in deep inelastic and diffractive scattering

1998

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We consider the production of charm by real and virtual photons. Special attention is paid to diffractive charm production, which provides information on the gluonic content of the Pomeron. Our calculations are based on the gluon distributions of the CKMT-model, which is shown to lead to agreement with the data on open charm production in deep inelastic scattering. We compare predictions for diffractive charm production of different models for the distribution of gluons in the Pomeron. Experiments at HERA should be able to discriminate between them. Predictions for beauty production in diffractive and non-diffractive interactions of photons are also given.

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Deep inelastic scattering events with a large rapidity gap at HERA

Cited by 166 publications

References 30 publications

New Results in Light-Front Phenomenology

New Results in Light-Front Phenomenology

Inclusive measurement of diffractive deep-inelastic scattering at HERA

Charm production in deep inelastic and diffractive scattering

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