Photoproduction of Narrow Resonances

Knapp, B. C.; Lee, W.; Leung, PingSun; Smith, S. D.; Wijangco, A.; Knauer, J. P.; Yount, D.; Nease, D.; Bronstein, J.; Coleman, R.; Cormell, L.; Gladding, G. E.; Gormley, M.; Messner, R.; O’Halloran, T.; Sarracino, John; Wattenberg, A.; Wheeler, David; Binkley, M.; Orr, R. S.; Peoples, J.; Read, Leonard

doi:10.1103/physrevlett.34.1040

Cited by 134 publications

(19 citation statements)

References 10 publications

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“…The dashed line shows the prediction of a soft pomeron model [29] in which δ ≈ 0.22. (b) The results of this analysis (solid circles) are compared to data from H1, ZEUS and the results of lower energy measurements [9,10]. The result of a pQCD calculation [34] in which the MRS-A ′ [35] parton distributions have been used is shown as the solid line.…”

Section: Muon Chamber Efficiencymentioning

confidence: 99%

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Measurement of elastic $J/\psi$ photoproduction at HERA

Breitweg

Bokel

Botje

et al. 1997

Zeitschrift f�r Physik C Particles and Fields

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The reaction γ p → J/ψ p has been studied in ep interactions using the ZEUS detector at HERA. The cross section for elastic J/ψ photoproduction has been measured as a function of the photon-proton centre of mass energy W in the range 40 < W < 140 GeV at a median photon virtuality Q 2 of 5 × 10 −5 GeV 2 . The photoproduction cross section, σ γp→J/ψp , is observed to rise steeply with W . A fit to the data presented in this paper to determine the parameter δ in the form σ γp→J/ψp ∝ W δ yields the value δ = 0.92 ± 0.14 ± 0.10. The differential cross section dσ/d|t| is presented over the range |t| < 1.0 GeV 2 where t is the square of the fourmomentum exchanged at the proton vertex. dσ/d|t| falls exponentially with a slope parameter of 4.6 ± 0.4 +0.4 −0.6 GeV −2 . The measured decay angular distributions are consistent with s-channel helicity conservation.

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Section: Muon Chamber Efficiencymentioning

confidence: 99%

“…J/ψ photoproduction has been measured as a function of W from threshold to W ≈ 20 GeV in fixed target experiments [9,10,11] and extended to W ≈ 140 GeV at HERA [4,12,13]. A review of the low energy experimental results can be found in reference [14].…”

Section: Introductionmentioning

confidence: 99%

Measurement of elastic $J/\psi$ photoproduction at HERA

Breitweg

Bokel

Botje

et al. 1997

Zeitschrift f�r Physik C Particles and Fields

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“…Diffractive ρ 0 production has also been investigated in bubble chamber studies of neutrino and antineutrino interactions with protons [60]. Soon after their discovery, the J/ψ and ψ(2S) mesons were observed in photoproduction at Cornell [61], FNAL [62], and SLAC [63], the FNAL measurements extending the photon energy range to 100 GeV. Photoproduction of charm states prior to 1985 is covered in the review by Holmes et al [64].…”

Section: Photoproductionmentioning

confidence: 99%

Exclusive Production of Neutral Vector Mesons at the Electron-Proton Collider HERA

Crittenden¹

1997

Springer Tracts in Modern Physics

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The first five years of operation of the multi-purpose experiments ZEUS and H1 at the electron-proton storage ring facility HERA have opened a new era in the study of vector-meson production in high-energy photon-proton interactions. The high center-ofmass energy available at this unique accelerator complex allows investigations in hitherto unexplored kinematic regions, providing answers to long-standing questions concerning the energy-dependence of the ρ 0 , ω, φ, and J/ψ production cross sections. The excellent angular acceptance of these detectors, combined with that of specialized tagging detectors at small production angles, has permitted measurements of elastic and inelastic production processes for both quasi-real photons and those of virtuality exceeding the squared mass of the vector meson. This report provides a quantitative picture of the present status of these studies, comparing them to the extensive measurements in this field at lower energies and summarizing topical developments in theoretical work motivated by the new data.

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“…The precise dependence of W(q2, q-P, q-f, Mz) on its arguments is obtained by assuming the same tensorial structure of (2) for calculating p" photoproduction. 2 Requiring that the t and Mx dependence be as described above yields W- (4) where s = (q + P)~, and the factor (1 -q2/M,$2 is the empirical dependence on q2 deduced from electroproduction data for small q2, consistent with vector meson dominant e. For simplicity we shall suppose that (4) holds for all q2. We set b = 3 GeVw2 from I/ -photoproduction4.…”

Section: I/ -2-mentioning

confidence: 99%