Diffractive photoproduction of ψ(2S) mesons at HERA

Adloff, C.; Andreev, V.; Andrieu, Bernard; Anthonis, T.; Astvatsatourov, A.; Babaev, A.; Bähr, J.; Baranov, P.; Barrelet, E.; Bartel, W.; Baumgartner, S.; Becker, J.; Beckingham, M.; Beglarian, A.; Behnke, O.; Beier, C.; Belousov, A.; Berger, Ch.; Berndt, T.; Bizot, J.C.; Böhme, J.; Boudry, V.; Braunschweig, W.; Brisson, V.; Bröker, H.-B.; Brown, D.; Brückner, W.; Bruncko, D.; Büsser, F.W.; Bunyatyan, A.; Burrage, A.; Buschhorn, G.; Bystritskaya, L.; Campbell, A.; Caron, S.; Cassol-Brunner, F.; 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.; 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.; Fleischmann, P.; Fleming, Y.H.; 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.; Grab, C.; Grabski, V.; Grässler, H.; Greenshaw, T.; Grindhammer, G.; Hadig, T.; Haidt, D.; Hajduk, L.; Haller, J.; 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.; Hovhannisyan, A.; Hurling, S.; Ibbotson, M.; İşsever, Ç.; Jacquet, A.; Jaffré, M.; Janauschek, L.; Janssen, X.; Jemanov, V.; Jönsson, L.; Johnson, Carrie L.; Johnson, D.; Jones, M.; Jung, H.; 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.; Kroseberg, J.; Krüger, K.; Kuhr, T.; Kurča, T.; 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.; Malden, N.; Malinovski, E.; Malinovski, I.; Mangano, S.; 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.; 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.; Niebergall, F.; Niebuhr, C.; Nix, O.; Nowak, G.; 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.; Potachnikova, I.; Povh, Bogdan; Rädel, G.; 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.; Schätzel, S.; 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, H.‐C.; 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.; Strauch, I.; Straumann, U.; Swart, M.; Tchetchelnitski, S.; Thompson, G.; Thompson, Peter; Tomasz, F.; Traynor, D.; Truöl, P.; Tsipolitis, G.; Tsurin, I.; Turnau, J.; Turney, J.E.; Tzamariudaki, E.; Udluft, Steffen; Uraev, A.; Urban, M.; Usik, A.; Valkár, Š.; Valkárová, A.; Vallée, C.; Mechelen, P. Van; Vassiliev, S.; Vazdik, Y.; Vest, A.; Vichnevski, A.; Wacker, K.; Wagner, J.; Wallny, R.; Waugh, Benedict Martin; Weber, G.; Wegener, D.; Werner, C.; Werner, N.; Wessels, M.; White, G.; Wiesand, S.; Wilksen, T.; Winde, M.; Winter, G. G.; Wissing, C.; Wobisch, M.; Woehrling, E.-E.; Wünsch, E.; Wyatt, A.; Žáček, J.; Zálešâk, J.; Zhang, Z.; Zhokin, A.; Zomer, F.; Nedden, M. zur

doi:10.1016/s0370-2693(02)02275-x

Cited by 85 publications

(65 citation statements)

References 22 publications

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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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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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“…Before we go to the proton-proton processes let us first summarize our description of HERA data [11,35,36]. In figure 5 we show results of calculations with the IvanovNikolaev [13,37] and Kutak-Staśto [38] gluon unintegrated distributions.…”

Section: J/ψ Productionmentioning

confidence: 99%

Exclusive photoproduction of charmonia in γp → V p and pp → pV p reactions within kt-factorization approach

Cisek

Schäfer

Szczurek

2015

J. High Energ. Phys.

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Exclusive photoproduction of charmonia in γp → V p and pp → pV p reactions within k t -factorization approach The total cross section for this process is calculated for different unintegrated gluon distributions and compared with the HERA data and the data extracted recently by the LHCb collaboration. The amplitude for γp → J/ψp (γp → ψ ′ p) is used to predict the cross section for exclusive photoproduction of J/ψ (ψ ′ ) mesons in proton-proton collisions. Compared to earlier calculations we include both Dirac and Pauli electromagnetic form factors. The effect of the Pauli form factor is quantified. We discuss the role of the J/ψ and ψ ′ cc wave functions for differential distributions and corresponding ratios for ψ ′ and J/ψ. Absorption effects are taken into account and their role is discussed in detail. Different differential distributions e.g. in J/ψ (ψ ′ ) rapidity and transverse momentum are presented and compared with existing experimental data. The unintegrated gluon distribution with nonlinear effects built in and Gaussian wave functions better describe recent experimental data of the LHCb collaboration but no definite conclusion on onset of saturation can be drawn. We present our results also for the Tevatron. A good agreement with the CDF experimental data points at the midrapidity for both J/ψ and ψ ′ is achieved.

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“…A deviation from such a trend in the measured cross section as x decreases, or equivalently, as W γp increases, could indicate a change in the evolution of the gluon density function, as expected at the onset of saturation. Both ZEUS [8] and H1 [6,7], fitted their data using a power law σ≈ W γp δ , and obtained δ = 0.69 ± 0.02 (stat) ± 0.03 (syst) and δ = 0.67 ± 0.03 (stat+syst), respectively. A fit to ALICE data alone gives δ = 0.68 ± 0.06 (stat+syst).…”

Section: J/ψ Photoproduction In P-pb Collisionsmentioning

confidence: 99%

“…On the other a e-mail: daniele.de.gruttola@cern.ch hand, p-Pb collisions allow the study of the evolution with energy of the gluon distribution in the proton, and provide a powerful tool to investigate gluon saturation. ALICE can extend the measurement done at HERA [6,7] and ZEUS [8] to higher γp center of mass energy. …”

mentioning

confidence: 99%

Charmonium photoproduction in ultra-peripheral p-Pb and Pb-Pb collisions with ALICE at the LHC

Gruttola

2015

EPJ Web of Conferences

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Abstract. The photoproduction of vector mesons in Ultra-Peripheral Collisions (UPC) is a powerful tool to probe the nuclear gluon distribution (Pb-Pb collisions) and the gluon structure function in the proton (p-Pb collisions). The first measurements of coherent photoproduced J/ψ and ψ(2S) in Pb-Pb collisions at √ s NN = 2.76 TeV, performed with the ALICE detector, are described and compared to STARLIGHT and QCD based models, in order to investigate nuclear gluon shadowing. The results of the measurement of exclusive J/ψ photoproduction off protons in p-Pb collisions at √ s NN = 5.02 TeV are also presented. Ultra-peripheral collisionsUltra-peripheral collisions may occur when two accelerated nuclei are separated by impact parameters larger than the sum of their radii: hadronic interactions are strongly suppressed so that both pure electromagnetic and photonuclear processes can be studied. These interactions can be measured in Pb-Pb collisions at the LHC, where the available centre of mass energy per nucleon pair is 2.76 TeV, allowing γγ interactions at ≈80 GeV and γp at ≈480 GeV center of mass energy, to be compared with 10 and 30 GeV respectively, reached at RHIC. An accelerated charge can be considered as a source of quasi-real photons with virtuality Q 2 depending on the radius of the Pb nucleus and being ∼30 MeV 2 , according to Fermi [1] and to relativistic approach by Weizsäcker [2] and Williams [3]. One of these quasi-real photons may interact either with the opposite ion or with one of its quasi-real photons. The cross section for photon induced reactions is large because the strong electromagnetic field of the nucleus enhances the intensity of the virtual photon flux, which grows as Z 2 , where Z is the charge of the nucleus. UPCs are characterized by the photoproduction of vector mesons (ρ 0 , J/ψ, ψ', Υ,...) and by pure QED processes giving rise to a di-lepton continuum. The physics of ultra-peripheral collisions is reviewed in [4,5]. Physics motivationsExclusive photoproduction of vector mesons, where a vector meson is produced in an event with no other final state particles, is of particular interest. In Pb-Pb collisions these measurements probe nuclear gluon shadowing in the low Bjorken-x region, where it is poorly known. On the other a e-mail: daniele.de.gruttola@cern.ch hand, p-Pb collisions allow the study of the evolution with energy of the gluon distribution in the proton, and provide a powerful tool to investigate gluon saturation. ALICE can extend the measurement done at HERA [6,7] and ZEUS [8] to higher γp center of mass energy. Pb-Pb collisionsExclusive photoproduction of vector mesons is expected to probe the nuclear gluon distribution [9], for which there is considerable uncertainty in the low-x region, as it can be seen in Fig.1, showing the ratio of their parton distribution functions for bounded and free protons [10,11]. Exclusive photoproduction can be either coherent, if the photon couples coherently to all nucleons, or incoherent, if the photon couples to a single nucleon. Coheren...

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Diffractive photoproduction of ψ(2S) mesons at HERA

Cited by 85 publications

References 22 publications

Heavy quarkonium: progress, puzzles, and opportunities

Heavy quarkonium: progress, puzzles, and opportunities

Exclusive photoproduction of charmonia in γp → V p and pp → pV p reactions within kt-factorization approach

Charmonium photoproduction in ultra-peripheral p-Pb and Pb-Pb collisions with ALICE at the LHC

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