Exclusive electroproduction of ϕ mesons at HERA

Chekanov, S.; Derrick, M.; Magill, S.; Miglioranzi, S.; Musgrave, B.; Repond, J.; Yoshida, R.; Pavel, N.; Antonioli, P.; Bari, G.; Basile, M.; Bellagamba, L.; Boscherini, D.; Bruni, A.; Bruni, G.; Romeo, G. Cara; Cifarelli, L.; Cindolo, E.; Contin, A.; Corradi, M.; Pasquale, S. De; Giusti, P.; Iacobucci, G.; Margotti, A.; Montanari, A.; Nania, R.; Palmonari, F.; Pesci, A.; Polini, A.; Rinaldi, L.; Sartorelli, G.; Zichichi, A.; Aghuzumtsyan, G.; Bartsch, D.; Brock, I.; Goers, S.; Hartmann, H.; Hilger, E.; Irrgang, P.; Jakob, H.‐P.; Kind, O. M.; Meyer, U.; Paul, E.; Rautenberg, J.; Renner, R.; Voss, K.; Wang, Meng; Wlasenko, M.; Bailey, D.; Brook, N. H.; Cole, J. E.; Heath, G. P.; Namsoo, T.; Robins, S. A.; Capua, M.; Fazio, S.; Mastroberardino, A.; Schioppa, M.; Susinno, G.; Tassi, E.; Kim, J. Y.; J., Ma K.; Helbich, M.; Ye, Ning; Ren, Z.; Schmidke, W. B.; Sciulli, F.; Chwastowski, J. J.; Eskreys, A.; Figiel, J.; Galas, A.; Olkiewicz, K.; Stopa, P.; Szuba, D.; Zawiejski, L.; Adamczyk, L.; Bołd, T.; Bold, I. Grabowska; Kisielewska, D.; Kowal, A.M.; Łukasik, J.; Przybycień, M.; Suszycki, L.; Szuba, J.; Kotański, A.; Słomiński, W.; Adler, V.; Behrens, U.; Bloch, I.; Borras, K.; Drews, G.; Fourletova, J.; Geiser, A.; Gladkov, D.; Göttlicher, P.; Gutsche, O.; Haas, T.; Hain, W.; Horn, C.; Kahle, B.; Kötz, U.; Kowalski, H.; Kramberger, G.; Lelas, D.; Lim, H.; Löhr, B.; Mankel, R.; Pellmann, I.; Nguyen, C.N.; Notz, D.; Quiroz, A E Nuncio; Raval, A.; Santamarta, R.; Schneekloth, U.; Stadie, H.; Stößlein, U.; Wolf, G.; Youngman, C.; Zeuner, Wolfram Dietrich; Schlenstedt, S.; Barbagli, G.; Gallo, E.; Genta, C.; Pelfer, P. G.; Bamberger, A.; Benen, A.; Karstens, F.; Dobur, D.; Vlasov, N.; Bussey, P.; Doyle, A. T.; Dunne, William M.; Ferrando, J.; Hamilton, J. H.; Saxon, D. H.; Skillicorn, O. H.; Gialas, I.; Carli, T.; Gosau, T.; Holm, U.; Krumnack, N.; Lohrmann, E.; Milite, M.; Salehi, H.; Schleper, P.; Sadenius, T. Schorner; Stonjek, S.; Wichmann, K.; Wick, K.; Ziegler, A.; Tooth, C. Collins; Foudas, C.; Fry, C. A.; Gonçalo, R.; Long, K.; Tapper, A.; Kataoka, M.; Nagano, K.; Tokushuku, K.; Yamada, S.; Yamazaki, Y.; Barakbaev, A. N.; Boos, E.G.; Pokrovskiy, N. S.; Zhautykov, B.O.; Son, D. C.; Favereau, J. de; Piotrzkowski, K.; Barreiro, F.; Glasman, C.; Jiménez, M.; Labarga, L.; Peso, J. Del; Terrón, J.; Zambrana, M.; Corriveau, F.; Liu, C.; Plamondon, M.; Veronneau, A. Robichaud; Walsh, R.; Zhou, C.; Tsurugai, T.; Антонов, А.; Dolgoshein, B. A.; Rubinsky, I.; Sosnovtsev, V.; Stifutkin, A.; Suchkov, S.; Dementiev, R. K.; Ermolov, P.; Gladilin, L. K.; Katkov, I.; Khein, L. A.; Korzhavina, I. A.; Kuzmin, V. A.; Levchenko, B. B.; Lukina, O. Yu.; Proskuryakov, A.S.; Shcheglova, L.M.; Zotkin, D.S.; Zotkin, S. A.; Abt, I.; Büttner, C.; Caldwell, A.; Liu, X.; Sutiak, J.; Coppola, N.; Grigorescu, G.; Keramidas, A.; Koffeman, E.; Kooijman, P.; Maddox, E.; Tiecke, H.; Vázquez, M.; Wiggers, L.; Brümmer, N.; Bylsma, B.; Durkin, L. S.; Ling, T. Y.; Allfrey, P.; Bell, M. A.; Cooper-Sarkar, A. M.; Cottrell, A.; Foster, B.; Grzelak, G.; Gwenlan, C.; Kohno, T.; Patel, Shruti; Straub, P.B.; Walczak, R.; Bellan, P.; Bertolin, A.; Brugnera, R.; Carlin, R.; Ciesielski, R.; Corso, F. Dal; Dusini, S.; Garfagnini, A.; Limentani, S.; Longhin, A.; Stančo, L.; Turcato, M.; Heaphy, E.A.; Metlica, F.; Y., Oh B.; Whitmore, J. J.; Iga, Y.; D’Agostini, G.; Marini, G.; Nigro, A.; Hart, J. C.; Abramowicz, H.; Gabareen, A. M.; Kananov, S.; Kreisel, A.; Levy, A.; Kuze, M.; Kagawa, S.; Tawara, T.; Hamatsu, R.; Kaji, Hiroshi; Kitamura, S.; Matsuzawa, K.; Ota, O.; D., Ri Y.; Costa, M.; Ferrero, M. I.; Monaco, V.; Sacchi, R.; Solano, A.; Arneodo, M.; Ruspa, M.; Fourletov, S.; Martin, J. F.; Butterworth, J. M.; Wilton, R. Hall; Jones, T. W.; Loizides, J. H.; Sutton, M. R.; Adams, C. Targett; Wing, M.; Ciborowski, J.; Kulinski, P.; Łużniak, P.; Malka, J.; Nowak, R. J.; Pawlak, J. M.; Sztuk, J.; Tymieniecka, T.; Tyszkiewicz, A.; Ukleja, A.; Ukleja, J.; Żarnecki, A. F.; Adamus, M.; Pluciński, P.; Eisenberg, Y.; Hochman, D.; Karshon, U.; Lightwood, M. S.; Brownson, E.; Danielson, T.; Everett, A.; Kçira, D.; Lammers, S.; Li, L.; Reeder, D.; Rosin, M.; Ryan, P.; Savin, A.; Smith, W. H.; Dhawan, S.; Bhadra, S.; Catterall, C. D.; Cui, Yanou; Hartner, G.; Menary, S.; Noor, U.; Soares, M. S.; Standage, J.; Whyte, J.

doi:10.1016/j.nuclphysb.2005.04.009

Cited by 96 publications

(107 citation statements)

References 74 publications

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103

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“…5 the handbag results on the ρ and φ cross sections are compared to experiment. Again good agreement with the H1 [25,32] and ZEUS [24,26,34] data is to be observed in a large range of Q 2 . The leading-twist contribution to these cross sections, i.e.…”

Section: Results On Cross Sectionssupporting

confidence: 74%

See 1 more Smart Citation

The role of the quark and gluon GPDs in hard vector-meson electroproduction

2007

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Electroproduction of light vector mesons is analyzed on the basis of handbag factorization. The required generalized parton distributions are constructed from the CTEQ6 parton distributions with the help of double distributions. The partonic subprocesses are calculated within the modified perturbative approach. The present work extends our previous analysis of the longitudinal cross section to the transverse one and other observables related to both the corresponding amplitudes. Our results are compared to recent experimental findings in detail.

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Section: Results On Cross Sectionssupporting

confidence: 74%

“…A standard trajectory is adopted for the valence quark Regge pole -α val (t) = 0.48 + 0.9 GeV −2 t. The parameter of the gluon residue is fixed from a fit against the HERA data for ρ [25] and φ production [26]:…”

Section: The Double Distribution Modelmentioning

confidence: 99%

The role of the quark and gluon GPDs in hard vector-meson electroproduction

2007

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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

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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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“…At large values of the centre-of-mass energy, W , this is usually viewed as a three-step process; the virtual photon γ * fluctuates into a qq pair which interacts with the proton through a two-gluon ladder and hadronizes into a vector meson, V . The production of ground-state vector mesons, V = ρ, ω, φ, J /ψ, Υ , which are 1S triplet qq states, has been extensively studied at HERA, particularly in several recent publications [1][2][3][4][5][6][7][8][9][10]. As the virtuality, Q 2 , of the photon increases, the process becomes hard and can be calculated in perturbative Quantum Chromodynamics (pQCD).…”

Section: Introductionmentioning

confidence: 99%

Exclusive electroproduction of two pions at HERA

Abramowicz¹,

Abt²,

Adamczyk³

et al. 2012

Eur. Phys. J. C

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The exclusive electroproduction of two pions in the mass range 0.4 < M ππ < 2.5 GeV has been studied with the ZEUS detector at HERA using an integrated luminosity of 82 pb −1 . The analysis was carried out in the kinematic range of 2 < Q 2 < 80 GeV 2 , 32 < W < 180 GeV and |t| < 0.6 GeV 2 , where Q 2 is the photon virtuality, W is the photon-proton centre-of-mass energy and t is the two-pion invariant-mass distribution is interpreted in terms of the pion electromagnetic form factor, |F (M ππ )|, assuming that the studied mass range includes the contributions of the ρ, ρ and ρ vector-meson states. The masses and widths of the resonances were obtained and the Q 2 dependence of the cross-section ratios σ (ρ → ππ)/σ (ρ) and σ (ρ → ππ)/σ (ρ) was extracted. The pion form factor obtained in the present analysis is compared to that obtained in e + e − → π + π − . a

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Exclusive electroproduction of ϕ mesons at HERA

Cited by 96 publications

References 74 publications

The role of the quark and gluon GPDs in hard vector-meson electroproduction

The role of the quark and gluon GPDs in hard vector-meson electroproduction

Heavy quarkonium: progress, puzzles, and opportunities

Exclusive electroproduction of two pions at HERA

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