Measurement of elastic ϒ photoproduction at HERA

Breitweg, J.; Derrick, M.; Krakauer, D.; Magill, S.; Mikunas, D.; Musgrave, B.; Repond, J.; Stanek, R. W.; Talaga, R. L.; Yoshida, R.; Zhang, H.; Mattingly, M.C.K.; Anselmo, F.; Antonioli, P.; Bari, G.; Basile, M.; Bellagamba, L.; Boscherini, D.; Bruni, A.; Bruni, G.; Romeo, G. Cara; Castellini, G.; Cifarelli, L.; Cindolo, F.; Contin, A.; Coppola, N.; Corradi, M.; Pasquale, S. De; Giusti, P.; Iacobucci, G.; Laurenti, G.; Levi, G.; Margotti, A.; Massam, T.; Nania, R.; Palmonari, F.; Pesci, A.; Polini, A.; Sartorelli, G.; Garcia, Y. Zamora; Zichichi, A.; Amelung, C.; Bornheim, A.; Brock, I.; Coböken, K.; Crittenden, J.; Deffner, R.; Eckert, M.; Grothe, M.; Hartmann, H.; Héinloth, K.; Heinz, L.; Hilger, E.; Jakob, H.‐P.; Kappes, A.; Katz, U.; Kerger, R.; Paul, E.; Pfeiffer, Mark; Schnurbusch, H.; Wieber, H.; Bailey, D.; Campbell-Robson, S.; Cottingham, W. N.; Foster, B.; Hall-Wilton, R.; Heath, G. P.; Heath, H. F.; McFall, J.D.; Piccioni, David; Roff, D. G.; Tapper, R. J.; Capua, M.; Iannotti, L.; Mastroberardino, A.; Schioppa, M.; Susinno, G.; Kim, J.Y.; Lee, J.H.; Lim, I. T.; Pac, M. Y.; Caldwell, A.; Cartiglia, N.; Jing, Z.; Liu, W.; Mellado, B.; Parsons, J. A.; Ritz, S.; Sampson, Scott E.; Sciulli, F.; Straub, P.B.; Zhu, Q. M.; Borzemski, P.; Chwastowski, J. J.; Eskreys, A.; Figiel, J.; Klimek, K.; Przybycień, M.; Zawiejski, L.; Adamczyk, L.; Bednarek, B.; Bukowy, M.; Czermak, A.; Jeleń, K.; Kisielewska, D.; Kowalski, T.; Przybycień, M.; Rulikowska-Zarȩbska, E.; Suszycki, L.; Zając, Józef; Duliński, Z.; Kotański, A.; Abbiendi, G.; Bauerdick, L. A. T.; Behrens, U.; Beier, H.; Bienlein, J. K.; Desler, K.; Drews, G.; Fricke, U.; Gialas, I.; Göebel, F.; Göttlicher, P.; Graciani, R.; Haas, T.; Hain, W.; Hartner, G.; Hasell, D.; Hebbel, K.; Johnson, K. F.; Kasemann, M.; Koch, W.; Kötz, U.; Kowalski, H.; Lindemann, Lars; Löhr, B.; Martínez, M. Lucio; Milewski, J.; Milite, M.; Monteiro, T.; Notz, D.; Pellegrino, A.; Pelucchi, F.; Piotrzkowski, K.; Rohde, M.; Roldán, J.; Ryan, J. J.; Saull, P. R. B.; Savin, A.A.; Schneekloth, U.; Schwarzer, O.; Selonke, F.; Stonjek, S.; Surrow, B.; Tassi, E.; Westphal, Douglas L.; Wolf, G.; Wollmer, U.; Youngman, C.; Zeuner, Wolfram Dietrich; Burow, B.D.; Coldewey, C.; Grabosch, H. J.; Meyer, Andreas Bernhard; Schlenstedt, S.; Barbagli, G.; Gallo, E.; Pelfer, P. G.; Maccarrone, G.; Votano, L.; Bamberger, A.; Eisenhardt, S.; Markun, P.; Raach, H.; Trefzger, T.; Wölfle, S.; Bromley, J. T.; Brook, N. H.; Bussey, P.; Doyle, A. T.; Lee, S.W.; Macdonald, N.; McCance, Gavin; Saxon, D. H.; Sinclair, L.E.; Skillicorn, I. O.; Strickland, E.; Waugh, R.; Bohnet, I.; Gendner, N.; Holm, U.; Meyer-Larsen, A.; Salehi, H.; Wick, K.; Garfagnini, A.; Gladilin, L. K.; Kçira, D.; Klanner, R.; Lohrmann, E.; Poelz, G.; Zetsche, Frank; Bacon, T. C.; Butterworth, I.; Cole, J. E.; Howell, G.; Lamberti, Luciano; Long, K.; Miller, D. B.; Pavel, N.; Prinias, A.; Sedgbeer, J. K.; Sideris, D.; Walker, R.; Mallik, U.; Wang, S.M.; Wu, J.; Cloth, P.; Filges, D.; Fleck, J. I.; Ishii, T.; Kuze, M.; Suzuki, I.; Tokushuku, K.; Yamada, S.; Yamauchi, K.; Yamazaki, Y.; Hong, S. J.; Lee, S.B.; Nam, S.; Park, S.K.; Lim, H.; Park, I.H.; Son, D. C.; Barreiro, F.; Fernandez, J.; Garcı́a, G.; Glasman, C.; Hernández, J. M.; Hervás, L.; Labarga, L.; Peso, J. Del; Puga, J.; Terrón, J.; Trocóniz, Jorge F de; Corriveau, F.; Hanna, D.; Hartmann, J.; Murray, W. N.; Ochs, A.; Riveline, M.; Stairs, D. G.; St-Laurent, Marie; Tsurugai, T.; Bashkirov, V.; Dolgoshein, B. A.; Stifutkin, A.; Bashindzhagyan, G. L.; Ermolov, P.; Golubkov, Yu. A.; Khein, L. A.; Korotkova, N.; Korzhavina, I. A.; Kuzmin, V. A.; Lukina, O. Yu.; Proskuryakov, A.S.; Shcheglova, L.M.; Solomin, A.; Zotkin, S. A.; Bokel, C.H.; Botje, M.; Brümmer, N.; Engelen, J.; Koffeman, E.; Kooijman, P.; Sighem, Ard van; Tiecke, H.; Tuning, N.; Verkerke, W.; Vossebeld, J. H.; Wiggers, L.; Wolf, E. de; Acosta, D.; Bylsma, B.; Durkin, L. S.; Gilmore, J.; Ginsburg, C. M.; Kim, C.L.; Ling, T. Y.; Nylander, P.; Romanowski, T. A.; Blaikley, H.E.; Cashmore, R. J.; Cooper-Sarkar, A. M.; Devenish, R.C.E.; Edmonds, J.K.; Große-Knetter, J.; Harnew, N.; Nath, C.; Noyes, V. A.; Quadt, A.; Ruske, O.; Tickner, James; Walczak, R.; Waters, D.; Bertolin, A.; Brugnera, R.; Carlin, R.; Corso, F. Dal; Dosselli, U.; Limentani, S.; Morandin, M.; Posocco, M.; Stančo, L.; Stroili, R.; Voci, C.; Oh, B.Y.; Okrasiński, J.R.; Toothacker, W. S.; Whitmore, J. J.; Iga, Y.; D’Agostini, G.; Marini, G.; Nigro, A.; Raso, M.; Hart, J. C.; McCubbin, N. A.; Shah, T.; Epperson, D.; Heusch, C. A.; Rahn, J.; Sadrozinski, H. F-W.; Seiden, A.; Wichmann, R.; Williams, D.C.; Abramowicz, H.; Briskin, G.; Dagan, S.; Kananov, S.; Levy, A.; Abe, T.; Fusayasu, T.; Inuzuka, M.; Nagano, K.; Umemori, Kensei; Yamashita, T.; Hamatsu, R.; Hirose, T.; Homma, K.; Kitamura, S.; Matsushita, T.; Nishimura, T.; Arneodo, M.; Cirio, R.; Costa, M.; Ferrero, M. I.; Maselli, S.; Monaco, V.; Peroni, C.; Petrucci, M.C.; Ruspa, M.; Sacchi, R.; Solano, A.; Staiano, A.; Dardo, M.; Bailey, D. C.; Fagerstroem, C.-P.; Galea, R.; Joo, K. K.; Levman, G.; Martin, J. F.; Orr, R. S.; Polenz, S.; Sabetfakhri, A.; Simmons, D.; Butterworth, J. M.; Catterall, C. D.; Hayes, M. E.; Heaphy, E.A.; Jones, T. W.; Lane, J.B.; Saunders, R. L.; Sutton, M. R.; Wing, M.; Ciborowski, J.; Grzelak, G.; Nowak, R. J.; Pawlak, J. M.; Pawlak, R.; Smalska, B.; Tymieniecka, T.; Wróblewski, A.; Zakrzewski, J.; Żarnecki, Aleksander Filip; Adamus, M.; Deppe, O.; Eisenberg, Y.; Hochman, D.; Karshon, U.; Badgett, W.; Chapin, D.; Cross, R.; Dasu, S.; Foudas, C.; Loveless, R.; Mattingly, S. E.K.; Reeder, D.D.; Smith, W. H.; Vaiciulis, A.; Wodarczyk, M.; Deshpande, A.; Dhawan, S.; Hughes, V. W.; Bhadra, S.; Frisken, W. R.; Khakzad, M.; Schmidke, W. B.

doi:10.1016/s0370-2693(98)01081-8

Cited by 109 publications

(94 citation statements)

References 34 publications

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“…The good agreement with the NLO prediction seen in figure 4a is reproduced. The LHCb measurements probe a new kinematic region complementary to that studied at HERA [4,5,7], as seen in figure 4b, and discriminate between LO and NLO predictions. In figure 4b, the LHCb data are also compared to the predictions given in ref.…”

Section: Cross-sectionmentioning

confidence: 85%

Measurement of the exclusive Υ production cross-section in pp collisions at s = 7 $$ \sqrt{s}=7 $$ TeV and 8 TeV

collaboration

Aaij²,

Adeva

et al. 2015

J. High Energ. Phys.

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A study is presented of central exclusive production of Υ(nS) states, where the Υ(nS) resonances decay to the µ + µ − final state, using pp collision data recorded by the LHCb experiment. The cross-section is measured in the rapidity range 2 < y(Υ) < 4.5 where the muons are reconstructed in the pseudorapidity range 2 < η(µ ± ) < 4.5. The data sample corresponds to an integrated luminosity of 2.9 fb −1 and was collected at centreof-mass energies of 7 TeV and 8 TeV. The measured Υ(1S) and Υ(2S) production crosssections are σ(pp → pΥ(1S)p) = 9.0 ± 2.1 ± 1.7 pb and σ(pp → pΥ(2S)p) = 1.3 ± 0.8 ± 0.3 pb, where the first uncertainties are statistical and the second are systematic. The Υ(1S) crosssection is also measured as a function of rapidity and is found to be in good agreement with Standard Model predictions. An upper limit is set at 3.4 pb at the 95% confidence level for the exclusive Υ(3S) production cross-section, including possible contamination from χ b (3P ) → Υ(3S)γ decays. The LHCb collaboration 15 IntroductionCentral exclusive production (CEP) of Υ(nS) (n = 1, 2, 3) resonances in pp collisions is thought to occur by photoproduction through the exchange of a photon and a pomeron (a colour-singlet system) between two protons, as illustrated in figure 1. Since the protons do not dissociate, typically only a small component of momentum transverse to the beam direction (p T ) is exchanged in the interaction. The photoproduction of Υ resonances at LHCb can be computed using perturbative quantum chromodynamics (QCD), given the high photon-proton centre-of-mass energy, W , and the cross-section depends on the square of the gluon parton-density function, g(x), where Bjorken-x is the fraction of the proton's momentum carried by the gluon [1]. Measurements of the production cross-sections for the Υ(nS) resonances in the forward region covered by the LHCb detector are sensitive to g(x) in the region of small x down to approximately 1.5 × 10 −5 , where the knowledge of g(x) is limited. Furthermore, predictions for the Υ(nS) cross-sections at leading order (LO) and next-to-leading order (NLO) in the strong-interaction coupling differ greatly for the values of W probed in Υ(nS) resonance production, and there are significant variations depending on the models used to describe the Υ wave function and the t-channel exchange [1][2][3]. Quarkonia photoproduction has been studied in exclusive production at HERA [4-9], the Tevatron [10] and the LHC [11][12][13]. At LHCb, exclusive production is associated with the absence of significant detector activity apart from that associated with the exclusive candidate. The background from proton dissociation occurring outside the detector acceptance is characterised as having a value of Υ candidate p T which is larger than that for exclusive production.-1 -

show abstract

Section: Cross-sectionmentioning

confidence: 85%

Measurement of the exclusive Υ production cross-section in pp collisions at s = 7 $$ \sqrt{s}=7 $$ TeV and 8 TeV

collaboration

Aaij²,

Adeva

et al. 2015

J. High Energ. Phys.

Self Cite

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“…The correction factor ζ V is estimated by constraining the calculated cross sections for elastic vector meson photoproduction on protons, σ γp→V p (W γp ), to reasonably reproduce the photoproduction data from HERA: [33] for J/Ψ and [33][34][35] for Υ(1s). Further details can be found in [14].…”

Section: B Exclusive Production Of Vector Mesonsmentioning

confidence: 99%

Constraining gluon shadowing using photoproduction in ultraperipheralpAandAAcollisions

Adeluyi

Bertulani

2012

Phys. Rev. C

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Photoproduction of heavy quarks and exclusive production of vector mesons in ultraperipheral proton-nucleus and nucleus-nucleus collisions depend significantly on nuclear gluon distributions. In the present study we investigate quantitatively the extent of the applicability of these processes at the Large Hadron Collider (LHC) in constraining the shadowing component of nuclear gluon modifications.

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“…3 and 4. The ϒ photoproduction data (triangles) from ZEUS [30] and H1 [31] at about W=100 GeV are compared to the theoretical calculation at this energy [2].…”

Section: Experimental Datamentioning

confidence: 99%

Roles of wave functions in the electroproduction of vector mesons

Ferreira¹,

Baltar²

2007

Braz. J. Phys.

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Elastic vector meson electroproduction is calculated through integrals of the overlap product of photon and vector meson wave functions, multiplied by the amplitude for the scattering of qq dipole pairs off the proton. In this nonperturbative QCD calculation, for sizes of the overlap functions that are smaller than the typical ranges of the interaction of the dipoles with the proton, the amplitudes factorize, with overlap strengths (integration extended over the light front coordinates describing the qq dipoles) containing all Q 2 dependence of the observables. This factorization is important in the description of the experimental data for all S-wave vector mesons.

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Measurement of elastic ϒ photoproduction at HERA

Cited by 109 publications

References 34 publications

Measurement of the exclusive Υ production cross-section in pp collisions at s = 7 $$ \sqrt{s}=7 $$ TeV and 8 TeV

Measurement of the exclusive Υ production cross-section in pp collisions at s = 7 $$ \sqrt{s}=7 $$ TeV and 8 TeV

Constraining gluon shadowing using photoproduction in ultraperipheralpAandAAcollisions

Roles of wave functions in the electroproduction of vector mesons

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