Measurement of J/ψ photoproduction at large momentum transfer at HERA

Chekanov, S.; Derrick, M.; Magill, S.; Musgrave, B.; Nicholass, D.; Repond, J.; Yoshida, R.; Antonioli, P.; Bari, G.; Bellagamba, L.; Boscherini, D.; Bruni, A.; Bruni, G.; Cindolo, F.; Corradi, M.; Iacobucci, G.; Margotti, A.; Nania, R.; Polini, A.; Antonelli, S.; Basile, M.; Bindi, M.; Cifarelli, L.; Contin, A.; Pasquale, S. De; Sartorelli, G.; Zichichi, A.; Bartsch, D.; Brock, I.; Hartmann, H.; Hilger, E.; Jakob, H.‐P.; Jüingst, M.; Nuncio-Quiroz, A. E.; Paul, E.; Samson, U.; Schönberg, V.; Shehzadi, R.; Wlasenko, M.; Morris, J. D.; Kaur, M.; Kaur, P.; Singh, Inderpal; Capua, M.; Fazio, S.; Mastroberardino, A.; Schioppa, M.; Susinno, G.; Tassi, E.; Kim, J.Y.; Ibrahim, Zainol Abidin; Idris, F. Mohamad; Kamaluddin, B.; Abdullah, W. A. T. Wan; Ye, Ning; Ren, Z.; Sciulli, F.; Chwastowski, J. J.; Eskreys, A.; Figiel, J.; Galas, A.; Olkiewicz, K.; Pawlik, B.; Stopa, P.; Zawiejski, L.; Adamczyk, L.; Bołd, T.; Grabowska-Bołd, I.; Kisielewska, D.; Łukasik, J.; Przybycień, M.; Suszycki, L.; Kotański, A.; Słomiński, W.; Bachynska, O.; Behnke, O.; Behr, J.; Behrens, U.; Blohm, C.; Borras, K.; Bot, D.; Ciesielski, R.; Coppola, N.; Fang, S. S.; Geiser, A.; Göttlicher, P.; Grebenyuk, J.; Gregor, I. M.; Haas, T.; Hain, W.; Hüttmann, A.; Januschek, F.; Kahle, B.; Katkov, I.; Klein, U.; Kötz, U.; Kowalski, H.; Libov, V.; Lisovyi, M.; Lobodzinska, E.; Löhr, B.; Mankel, R.; Melzer-Pellmann, I.-A.; Miglioranzi, S.; Montanari, A.; Namsoo, T.; Notz, D.; Parenti, A.; Roloff, Philipp; Rubinsky, I.; Schneekloth, U.; Спиридонов, А.; Szuba, D.; Szuba, J.; Theedt, T.; Tomaszewska, J.; Wolf, G.; Wrona, K.; Yagües-Molina, A. G.; Youngman, C.; Zeuner, W. D.; Drugakov, V.; Lohmann, W.; Schlenstedt, S.; Barbagli, G.; Gallo, E.; Pelfer, P. G.; Bamberger, A.; Dobur, D.; Karstens, F.; Vlasov, N.; Bussey, P.; Doyle, A. T.; Forrest, M.; Saxon, D. H.; Skillicorn, I. O.; Gialas, I.; Papageorgiu, K.; Holm, U.; Klanner, R.; Lohrmann, E.; Perrey, H.; Schleper, P.; Schörner-Sadenius, T.; Sztuk, J.; Stadie, H.; Turcato, M.; Long, K.; Tapper, A.; Matsumoto, T.; Nagano, K.; Tokushuku, K.; Yamada, S.; Yamazaki, Y.; Barakbaev, A. N.; Boos, E.G.; Pokrovskiy, N. S.; Zhautykov, B.O.; Aushev, V.; Borodin, M.; Каденко, І.; Korol, Ie.; Kuprash, O.; Lontkovskyi, D.; Makarenko, I.; Onishchuk, Y.; Salii, A.; Sorokin, Iu.; Verbytskyi, A.; Viazlo, V.; Volynets, O.; Zenaiev, O.; Zolko, M.; Son, D. C.; Favereau, J. de; Piotrzkowski, K.; Barreiro, F.; Glasman, C.; Jiménez, M.; Peso, J. Del; Ron, E.; Terrón, J.; Uribe-Estrada, C.; Corriveau, F.; Schwartz, J.; Zhou, C.; Tsurugai, T.; Антонов, А.; Dolgoshein, B. A.; Gladkov, D.; Sosnovtsev, V.; Stifutkin, A.; Suchkov, S.; Dementiev, R. K.; Ermolov, P.; Gladilin, L. K.; Golubkov, Yu. A.; Khein, L. A.; Korzhavina, La.; Kuzmin, V. A.; Levchenko, B. B.; Lukina, O. Yu.; Proskuryakov, A.S.; Shcheglova, L.M.; Zotkin, D.S.; Abt, I.; Caldwell, A.; Kollár, D.; Reisert, B.; Schmidke, W. B.; Grigorescu, G.; Keramidas, A.; Koffeman, E.; Kooijman, P.; Pellegrino, A.; Tiecke, H.; Vázquez, M.; Wiggers, L.; Brümmer, N.; Bylsma, B.; Durkin, L. S.; Lee, A.; Ling, T. Y.; Cooper-Sarkar, A. M.; Devenish, R.C.E.; Ferrando, J.; Foster, B.; Gwenlan, C.; Horton, K.; Oliver, K.; Robertson, A. I.; Walczak, R.; Bertolin, A.; Corso, F. Dal; Dusini, S.; Longhin, A.; Stančo, L.; Brugnera, R.; Carlin, R.; Garfagnini, A.; Limentani, S.; Raval, A.; Whitmore, J.; Iga, Y.; D’Agostini, G.; Marini, G.; Nigro, A.; Hart, J. C.; Abramowicz, H.; Ingbir, R.; Kananov, S.; Levy, A.; Stern, A.; Ishitsuka, M.; Kanno, T.; Kuze, M.; Maeda, J.; Hori, R.; Okazaki, N.; Shimizu, S.; Hamatsu, R.; Kitamura, S.; Ota, O.; Ri, Y.D.; Costa, M.; Ferrero, M. I.; Monaco, V.; Sacchi, R.; Sola, V.; Solano, A.; Arneodo, M.; Ruspa, M.; Fourletov, S.; Martin, J. F.; Stewart, T. P.; Boutle, S.; Butterworth, J. M.; Jones, T. W.; Loizides, J. H.; Wing, M.; Brzozowska, B.; Ciborowski, J.; Grzelak, G.; Kulinski, P.; Łużniak, P.; Malka, J.; Nowak, R. J.; Pawlak, J. M.; Perlański, W.; Żarnecki, A. F.; Adamus, M.; Pluciński, P.; Tymieniecka, T.; Eisenberg, Y.; Hochman, D.; Karshon, U.; Brownson, E.; Reeder, D.D.; Savin, A.; Smith, W. H.; Wolfe, H.; Bhadra, S.; Catterall, C. D.; Hartner, G.; Noor, U.; Whyte, J.

doi:10.1007/jhep05(2010)085

Cited by 24 publications

(25 citation statements)

References 52 publications

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“…Here K 1 is the modified Bessel function, and the dimensional parameter m ∼ Λ QCD will be constrained later. The replacement (9) introduces an exponential suppression at large distances, leaving the short-distance part unmodified. We will also consider the running coupling effects in our analysis.…”

Section: High Energy Evolution From the Jimwlk Equationmentioning

confidence: 99%

“…These measurements make it possible to constrain the total parton densities inside the proton to a very good precision. In addition, measurements of diffractive vector meson production [5][6][7][8][9][10][11][12][13] provide information on the spatial extent of the gluon distribution and in case of incoherent diffraction, even its fluctuations [14][15][16]. In the future, if an electron-ion collider is realized [17][18][19], DIS with a variety of nuclear targets will allow unprecedented detailed studies of proton and nuclear structure (see for example [20][21][22][23]).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Confronting the impact parameter dependent JIMWLK evolution with HERA data

2018

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The small-x evolution of protons is determined from numerical solutions of the JIMWLK equations, starting from an initial condition at moderate x for a finite size proton. The resulting dipole amplitude is used to calculate the total reduced cross section σ r and charm reduced cross section σ rc , as well as diffractive vector meson production. We compare results to experimental data from HERA and discuss fundamental problems arising from the regime sensitive to nonperturbative physics. We emphasize that information on the gluonic content of the proton, gluon spatial distributions and correlations over wide ranges in x, which can in principle be constrained by our study, are essential ingredients for describing the initial state in proton-proton and proton-ion collisions. Future electron nucleus collisions at an electron-ion collider will provide important additional insight for heavier nuclei. We further demonstrate that it is not possible to rigorously probe the saturation regime of the color glass condensate framework in electronproton collisions at HERA energies and that electron-heavy ion collisions will be essential to access its regime of validity.

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Section: High Energy Evolution From the Jimwlk Equationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Confronting the impact parameter dependent JIMWLK evolution with HERA data

2018

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“…[10] within framework of the QCD factorization theorem has demonstrated that the experimental data can be described if the energy dependence of two body pQCD scattering amplitude would be significantly slower at large −t, than at t = 0. Recently, a new experimental data on the photoproduction process γp → J/ψ + rapidity gap + X was reported [3]. This data also indicate a rather dramatic slowing down of the dependence of the cross section of this process on the energy with increase of −t.…”

Section: Introductionmentioning

confidence: 86%

“…(Such processes can be dubbed hard inelastic diffractive (HID) processes, in order to distinguish them from the diffractive processes, when the final particle remain a proton: X = p). These processes with V = J/ψ were extensively studied experimentally at HERA [1][2][3] due to a reasonably large cross section and a clean final state -production of an isolated charmonium state with large transverse momentum which is separated from the proton remnants by a large rapidity gap. Theoretically this process is advantageous, since the large charmonium mass m 2 V makes it possible to evaluate cross section of the process in perturbative QCD, for different values of transverse momentum transfer −t and virtuality of the photon Q 2 [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

The energy dependence of the hard exclusive diffractive processes in pQCD as the function of momentum transfer

2010

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We predict the dependence on energy of photo(electro) production processes: γ(γ * )+ p → V + X with large rapidity gap at small x and large momentum −t transferred to V in pQCD. Here V is a heavy quarkonium (J/ψ, Υ) or longitudinally polarized light vector meson (in the electroproduction processes), etc. In the kinematics of HERA we calculate the dependence on energy of cross sections of these processes as the function of momentum transfer t, photon virtuality Q 2 and/or quarkonium mass. In the kinematical region Q 2 0 ≤ −t ≪ Q 2 + M 2 V the nontrivial energy dependence of the cross section for the vector meson production due to the photon scattering off a parton follows within QCD from the summing of the double logarithmic terms. In the second regime −t ≥ Q 2 +M 2 V within DGLAP approximation in all orders of perturbation theory the qq − parton elastic cross section is energy independent. We show that the correct account of the double logarithmic terms and of the gluon radiation including kinematical constraints removes the disagreement between pQCD calculations and recent HERA experimental data. The explicit formula for the dependence of the differential cross section d 2 σ dtdx J of these processes on s γ * N is obtained. We show that perturbative Pomeron type behavior may reveal itself only at energies significantly larger than those available at HERA. In addition we evaluate the energy dependence of DVCS processes.Within the DGLAP approximation [12][13][14] the function f DL is obtained by summing large α s (N c /2π) ln(x J /x) ln(Q 2 + M 2 V )/(Q 2 0 − t) terms, that arise in the integration over parton transverse momenta in the domain where α s ≪ 1. Here x J = −t/M 2 X is the fraction of the proton momentum carried by the parton involved in the large t elastic scattering. Variables x i are the fractions of the proton momentum carried by gluons exchanged in t channel which are attached to a parton of the proton (For the explicit definition of x 1 , x 2 see section 2.). Since at large t transverse momenta of exchanged gluons are large, x i are not vastly different.

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“…Hence also the BFKL Pomeron may carry non-zero transverse momentum, and the corresponding amplitude is governed by the non-forward BFKL Pomeron. This formalism was applied [5,6,[33][34][35] some time ago to the data from HERA on J/ψ, ρ and φ diffractive mesons photoproduction [1,2,36] with large transverse momentum p T and was shown to describe the data well. In this paper we revisit the diffractive J/ψ photoproduction at HERA and use the established description of this process to estimate the BFKL Pomeron loop contribution to inclusive vector meson hadroproduction.…”

Section: Contentsmentioning

confidence: 99%

BFKL Pomeron loop contribution in diffractive photoproduction and inclusive hadroproduction of J/ψ and ϒ

Kotko

Motyka

Sadzikowski

et al. 2019

J. High Energ. Phys.

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We analyze contributions to the heavy vector meson production with large transverse momentum in proton-proton and diffractive photon-proton scattering driven by an exchange of two Balitsky-Fadin-Kuraev-Lipatov Pomerons in the squared amplitudes. The Pomerons couple to a single parton and form a Pomeron loop closed by the vector meson impact factors. For the photon-proton case the diffractive cut of the Pomeron loop contributes, and for the inclusive hadroproduction one finds the loop with two cut Pomerons. We compute both of these Pomeron loop contributions and study in detail their properties. The results are then used to calculate the cross sections for diffractive J/ψ photoproduction with large transverse momentum at HERA and the correlated two Pomeron contribution for inclusive J/ψ and Υ production cross sections at the LHC. Within a unified approach a good description of the photoproduction data is found, but correlated two Pomeron mechanism gives only a small contribution to hadroproduction of the vector mesons at the LHC.

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Measurement of J/ψ photoproduction at large momentum transfer at HERA

Cited by 24 publications

References 52 publications

Confronting the impact parameter dependent JIMWLK evolution with HERA data

Confronting the impact parameter dependent JIMWLK evolution with HERA data

The energy dependence of the hard exclusive diffractive processes in pQCD as the function of momentum transfer

BFKL Pomeron loop contribution in diffractive photoproduction and inclusive hadroproduction of J/ψ and ϒ

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