Measurement of elastic φ photoproduction at HERA

Derrick, M.; Botje, M.; Chlebana, F.; Engelen, J.; Kamps, Marc de; Kooijman, P.; Kruse, A.; Sighem, A.I. van; Tiecke, H.; Verkerke, W.; Vossebeld, J. H.; Vreeswijk, M.; Wiggers, L.; Wolf, E. de; Woudenberg, R. van

doi:10.1016/0370-2693(96)00172-4

Cited by 94 publications

(62 citation statements)

References 43 publications

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“…The QCD-inspired version of the Pomeron exchange of Donnachie and Landshoff [5], in which the Pomeron is replaced by two non-perturbative To check whether our model provides a reasonable energy dependence we have also calculated the differential cross section at a much larger photon energy (p γ lab = 2611 GeV). The result is depicted in Fig 4 (solid line) along with a two-parameter fit of |t| ≤ 0.5 GeV 2 data from ZEUS [36]. The hatched area indicates the uncertainties in the forward cross section and the slope parameter.…”

Section: Fig 3 Shows the Diquark Model Predictions (Solid Line) Formentioning

confidence: 98%

Hard exclusive photoproduction ofΦmesons

Berger

Schweiger

2000

Phys. Rev. D

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We calculate the differential cross section and single-polarization observables for the reaction γ p → Φ p within perturbative QCD, treating the proton as a quark-diquark system. The phenomenological couplings of gauge bosons to (spatially extended) diquarks and the quark-diquark distribution amplitude of the proton are adopted from previous investigations of baryon form factors and two-photon processes. Going beyond leading order, we take into account hadron-mass effects by means of a systematic expansion in the small parameter (hadron mass/ photon energy). With the Φ-meson distribution amplitude taken from the literature our predictions for the differential cross section at |t| > ∼ 4GeV 2 seem to provide a reasonable extrapolation of the low-t data and are also comparable in magnitude with the results of a two-gluon exchange model in which the gluons are considered as a remnant of the pomeron. For momentum transfers of a few GeV hadron-mass effects appear still to be sizeable.

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Section: Fig 3 Shows the Diquark Model Predictions (Solid Line) Formentioning

confidence: 98%

Hard exclusive photoproduction ofΦmesons

Berger

Schweiger

2000

Phys. Rev. D

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“…Experimentally, most of the world data exist in the high energy diffractive region. These include results from DESY [10][11][12], Cornell [13,14], SLAC [15][16][17], Fermilab [18,19], Daresbury [20,21], and HERA [22,23]. Due to the inherently small φ cross sections, these data are generally sparse with wide energy bin-widths and limited statistical precision.…”

Section: Introductionmentioning

confidence: 99%

Data analysis techniques, differential cross sections, and spin density matrix elements for the reaction γp→ϕp

Dey¹,

Meyer²,

Bellis³

et al. 2014

Phys. Rev. C

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High-statistics measurements of differential cross sections and spin density matrix elements for the reaction γp → φp have been made using the CLAS detector at Jefferson Lab. We cover center-of-mass energies ( √ s) from 1.97 to 2.84 GeV, with an extensive coverage in the φ production angle. The high statistics of the data sample made it necessary to carefully account for the interplay between the φ natural lineshape and effects of the detector resolution, that are found to be comparable in magnitude. We study both the charged-Further, for the charged mode, we differentiate between the cases where the final K − track is directly detected or its momentum reconstructed as the total missing momentum in the event. The two charged-mode topologies and the neutral-mode have different resolutions and are calibrated against each other. Extensive usage is made of kinematic fitting to improve the reconstructed φ mass resolution. Our final results are reported in 10-and mostly 30-MeV-wide √ s bins for the charged-and the neutral-modes, respectively. Possible effects from K + * channels with pKK final states are discussed. These present results constitute the most precise and extensive φ photoproduction measurements to date and in conjunction with the ω photoproduction results recently published by CLAS, will greatly improve our understanding of low energy vector meson photoproduction.

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“…[6]; for the φ meson, we used the Donnachie-Landshoff (DL) model [34]. The description of the available data on φ photoproduction The fixed-target [35,36] and HERA [37,38] data vs. the DonnachieLandshoff (DL) model [34].…”

Section: Coherent Photoproduction Of Vector Mesons In Upcsmentioning

confidence: 99%

Coherent photoproduction of vector mesons in ultraperipheral heavy ion collisions: Update for run 2 at the CERN Large Hadron Collider

2016

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We make predictions for the cross sections of coherent photoproduction of ρ, φ, J/ψ, ψ(2S), and Υ(1S) mesons in Pb-Pb ultraperipheral collisions (UPCs) at √ sNN = 5.02 TeV in the kinematics of run 2 at the Large Hadron Collider extending the approaches successfully describing the available Pb-Pb UPC data at √ sNN = 2.76 TeV. Our results illustrate the important roles of hadronic fluctuations of the photon and inelastic nuclear shadowing in photoproduction of light vector mesons on nuclei and the large leading twist nuclear gluon shadowing in photoproduction of quarkonia on nuclei. We show that the ratio of ψ(2S) and J/ψ photoproduction cross sections in Pb-Pb UPCs is largely determined by the ratio of these cross sections on the proton. We also argue that UPCs with electromagnetic excitations of the colliding ions followed by the forward neutron emission allows one to significantly increase the range of photon energies accessed in vector meson photoproduction on nuclei.

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Measurement of elastic φ photoproduction at HERA

Cited by 94 publications

References 43 publications

Hard exclusive photoproduction ofΦmesons

Hard exclusive photoproduction ofΦmesons

Data analysis techniques, differential cross sections, and spin density matrix elements for the reaction γp→ϕp

Coherent photoproduction of vector mesons in ultraperipheral heavy ion collisions: Update for run 2 at the CERN Large Hadron Collider

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