Diffractive photoproduction of J/ψ mesons with large momentum transfer at HERA

Aktas, A.; Andreev, V.; Anthonis, T.; Astvatsatourov, A.; Babaev, A.; Backović, S.; Bähr, J.; Baranov, P.; Barrelet, E.; Bartel, W.; Baumgartner, S.; Becker, J.; Beckingham, M.; Beglarian, A.; Behnke, O.; Behrendt, O.; Belousov, A.; Berger, Ch.; Berndt, T.; Bizot, J.C.; Böhme, J.; Boenig, M.-O.; Boudry, V.; Braciník, J.; Braunschweig, W.; Brisson, V.; Bröker, H.-B.; Brown, D.; Bruncko, D.; Büsser, F.W.; Bunyatyan, A.; Burrage, A.; Buschhorn, G.; Bystritskaya, L.; Campbell, A.; Caron, S.; Cassol-Brunner, F.; Chekelian, V.; Clarke, D.; 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.; Dubak, A.; Duprel, C.; Eckerlin, G.; Efremenko, V.; Egli, S.; Eichler, R.; Eisele, F.; Ellerbrock, M.; Elsen, E.; Erdmann, M.; Erdmann, W.; Faulkner, Peter; Favart, L.; Fedotov, A.; Felst, R.; Ferencei, J.; Ferron, S.; Fleischer, M.; Fleischmann, P.; Fleming, Y.H.; Flucke, G.; Flügge, G.; Fomenko, A.; Foresti, I.; Formánek, J.; Franke, G.; Frising, G.; Gabathuler, E.; Gabathuler, K.; Garvey, J.; Gassner, J.; Gayler, J.; Gerhards, R.; Gerlich, C.; Ghazaryan, S.; Goerlich, L.; Gogitidze, N.; Gorbounov, S.; Grab, C.; Grabski, V.; Grässler, H.; Greenshaw, T.; Grindhammer, G.; Haidt, D.; Hajduk, L.; Haller, J.; Heinemann, B.; Heinzelmann, G.; Henderson, R. C. W.; Henschel, H.; Henshaw, O.; Heremans, R.; Herrera, G.; Herynek, I.; Hildebrandt, M.; Hilgers, M.; Hiller, K. H.; Hladký, J.; Höting, P.; Hoffmann, D.; Horisberger, R.; Hovhannisyan, A.; Ibbotson, M.; Jacquet, M.; Janauschek, L.; Janssen, X.; Jemanov, V.; Jönsson, L.; Johnson, Carrie L.; Johnson, D.; Jones, M.; Jung, H.; Kant, D.; Kapichine, M.; Karlsson, Martin; Katzy, J.; Keil, Frerich J.; Keller, N.; Kennedy, J.; Kenyon, I. R.; Kiesling, C.; Klein, M.; Kleinwort, C.; Kluge, T.; Knies, G.; Koblitz, B.; Kolya, S. D.; Korbel, V.; Kostka, P.; Koutouev, R.; Koutov, A.; Kroseberg, J.; Krüger, K.; Kueckens, J.; Kuhr, T.; Landon, M. P. J.; Lange, W.; Laštovička, T.; Laycock, P.; Lebedev, A.; Leißner, B.; Lemrani, R.; Lendermann, V.; Levonian, S.; List, B.; Lobodzinska, E.; Loktionova, N.; López-Fernández, R.; Lubimov, V.; Lueders, H.; Lüders, S.; Lüke, D.; Lytkin, L.; Makankine, A.; Malden, N.; Malinovski, E.; Mangano, S.; 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.; Michine, S.; Mikocki, S.; Milstead, D.; Mohrdieck, S.; Moreau, F.; Morozov, A.; Morris, J. V.; Müller, K.; Мурін, П.; Nagovizin, V.; Naroska, B.; Naumann, J.; Naumann, T.; Newman, P. R.; Niebergall, F.; Niebuhr, C.; Nikitin, D.; Nowak, G.; Nožička, M.; Olivier, B.; Olsson, J. E.; Ozerov, D.; Panassik, V.; Pascaud, C.; Patel, G. D.; Peez, M.; Pérez, E.; Petrukhin, A.; Phillips, J. P.; Pitzl, D.; Pöschl, R.; Povh, Bogdan; Raičević, N.; Rauschenberger, J.; Reimer, P.; Reisert, B.; Risler, C.; Rizvi, E.; Robmann, P.; Roosen, R.; Rostovtsev, A.; Rusakov, S. V.; Rybicki, K.; Sankey, D. P. C.; Sauvan, E.; Schätzel, S.; Scheins, J.; Schilling, F. P.; Schleper, P.; Schmidt, D.; Schmidt, S.; Schmitt, S.; Schneider, M.; Schoeffel, L.; Schöning, A.; Schröder, V.; Schultz‐Coulon, H.‐C.; Schwanenberger, C.; Sedlák, Kamil; Sefkow, F.; 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.; Strauch, I.; Straumann, U.; Thompson, G.; Thompson, P. D.; Tomasz, F.; Traynor, D.; Truöl, P.; Tsipolitis, G.; Tsurin, I.; Turnau, J.; Turney, J.E.; Tzamariudaki, E.; Uraev, A.; Urban, M.; Usik, A.; Valkár, Š.; Valkárová, A.; Vallée, Claude; Mechelen, P. Van; Trevino, A. Vargas; Vassiliev, S.; Vazdik, Y.; Veelken, C.; Vest, A.; Vichnevski, A.; Volchinski, V.; Wacker, K.; Wagner, J.; Wallny, R.; Waugh, Benedict Martin; Weber, G.; Weber, R.; Wegener, D.; Werner, C.; Werner, N.; Wessels, M.; Wessling, B.; Winde, M.; Winter, G. G.; Wissing, C.; Woehrling, E.-E.; Wünsch, E.; Wyatt, A.; Žáček, J.; Zálešâk, J.; Zhang, Z.; Zhokin, A.; Zomer, F.; Nedden, M. zur

doi:10.1016/j.physletb.2003.06.056

Cited by 71 publications

(106 citation statements)

References 37 publications

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“…It may therefore be possible to fix both α s values at 0.17 and obtain a good description of the data in both normalisation and shape. This is in comparison to the value α s = 0.18 as used for recent H1 measurements [26,25].…”

Section: Resultssupporting

confidence: 54%

Deeply Virtual Compton Scattering and Diffractive High t Photons at H1

Beckingham¹

2007

Proceedings of Diffraction 06, International Workshop on Diffraction in High-Energy Physics — PoS(DIFF2006)

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A new preliminary H1 measurement of the DVCS cross section, measured during the HERA II running period, and the preliminary H1 measurement of diffractive high t photon production are presented. The DVCS cross sections, measured in the kinematic range 6.5 < Q 2 < 80 GeV 2 , 30 < W < 80 GeV and |t| < 1 GeV 2 as a function of t, Q 2 and W , are in good agreement with the previously published H1 results and are compatible with the ZEUS measurement. Fits to the combined H1 results of the form exp(−b|t|), (1/Q 2 ) n and W δ are able to describe the t, Q 2 and W cross sections, respectively. The data are described by NLO QCD and colour dipole model predictions in both shape and normalisation. Diffractive high t photon production cross sections have been measured differentially as a function of x IP and t, in the kinematic range p t(γ) > 2 GeV, 175 < W < 247 GeV, 1×10 −4 < x IP < 7×10 −4 and y IP < 0.018. The cross sections are found to have a reasonable agreement in both normalisation and shape with a LLA BFKL prediction. In particular, the cross section is found to rise very steeply with decreasing x IP .

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Section: Resultssupporting

confidence: 54%

Deeply Virtual Compton Scattering and Diffractive High t Photons at H1

Beckingham¹

2007

Proceedings of Diffraction 06, International Workshop on Diffraction in High-Energy Physics — PoS(DIFF2006)

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“…In proton-dissociative processes, m Y , mass of the state Y , is less than about 2 GeV or z lies in the 0.95 z 1. Many measurements of the diffractive production of the ρ 0 , ω, φ, J/ψ, ψ(2S) and Υ states have been performed at HERA [747][748][749][750][751][752][753][754][755][756][757][758].…”

Section: Ep Collisionsmentioning

confidence: 99%

Heavy quarkonium: progress, puzzles, and opportunities

Brambilla¹,

Eidelman²,

Heltsley³

et al. 2011

Advances in the Physics of Particles and Nuclei

103

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A golden age for heavy quarkonium physics dawned a decade ago, initiated by the confluence of exciting advances in quantum chromodynamics (QCD) and an explosion of related experimental activity. The early years of this period were chronicled in the Quarkonium Working Group (QWG) CERN Yellow Report (YR) in 2004, which presented a comprehensive review of the status of the field at that time and provided specific recommendations for further progress. However, the broad spectrum of subsequent breakthroughs, surprises, and continuing puzzles could only be partially anticipated. Since the release of the YR, the BESII program concluded only to give birth to BESIII; the B-factories and CLEO-c flourished; quarkonium production and polarization measurements at HERA and the Tevatron matured; and heavy-ion collisions at RHIC have opened a window on the deconfinement regime. All these experiments leave legacies of quality, precision, and unsolved mysteries for quarkonium physics, and therefore beg for continuing investigations at BESIII, the LHC, RHIC, FAIR, the Super Flavor and/or Tau-Charm factories, JLab, the ILC, and beyond. The list of newly-found conventional states expanded to include hc(1P ), χc2(2P ), B + c , and η b (1S). In addition, the unexpected and still-fascinating X(3872) has been joined by * Editors † Section coordinators ‡ Corresponding author: bkh2@cornell.edu more than a dozen other charmonium-and bottomonium-like "XY Z" states that appear to lie outside the quark model. Many of these still need experimental confirmation. The plethora of new states unleashed a flood of theoretical investigations into new forms of matter such as quark-gluon hybrids, mesonic molecules, and tetraquarks. Measurements of the spectroscopy, decays, production, and in-medium behavior of cc, bb, and bc bound states have been shown to validate some theoretical approaches to QCD and highlight lack of quantitative success for others. Lattice QCD has grown from a tool with computational possibilities to an industrialstrength effort now dependent more on insight and innovation than pure computational power. New effective field theories for the description of quarkonium in different regimes have been developed and brought to a high degree of sophistication, thus enabling precise and solid theoretical predictions. Many expected decays and transitions have either been measured with precision or for the first time, but the confusing patterns of decays, both above and below open-flavor thresholds, endure and have deepened. The intriguing details of quarkonium suppression in heavy-ion collisions that have emerged from RHIC have elevated the importance of separating hotand cold-nuclear-matter effects in quark-gluon plasma studies. This review systematically addresses all these matters and concludes by prioritizing directions for ongoing and future efforts.

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“…The elastic and proton-dissociative J /ψ cross sections as functions of the squared four-momentum transfer t at the proton vertex show a fast fall with increasing |t| [4,5,[18][19][20][21][22][23][24][25]. For the elastic J /ψ cross section the t-dependence can be parametrised by an exponential function dσ/dt ∝ e −b el |t| as expected from diffractive scattering.…”

Section: Introductionmentioning

confidence: 99%

“…Diffractive J /ψ production has been studied previously at HERA at low values of |t| [4,5,[18][19][20][21][22][23], and also at very large values of |t| [24,25], where proton-dissociative J /ψ production dominates.…”

Section: Introductionmentioning

confidence: 99%