Inelastic and Elastic Photoproduction of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mfrac><mml:mrow><mml:mi>J</mml:mi></mml:mrow><mml:mrow><mml:mi>ψ</mml:mi></mml:mrow></mml:mfrac><mml:mn /><mml:mo>(</mml:mo><mml:mn>3097</mml:mn><mml:mo>)</mml:mo><mml:mn /></mml:math>

Denby, B.; Bharadwaj, V.; Summers, D. J.; Eisner, A. M.; Kennett, R.; Lu, A.; Morrison, R. J.; Witherell, M. S.; Yellin, S.; Estabrooks, P. G.; Pinfold, J. L.; Bartlett, D. F.; Bhadra, S.; Duncan, A. L.; Elliott, J. R.; Nauenberg, U.; Appel, J. A.; Biel, J.; Bintinger, D.; Bronstein, J.; Daum, C.; Mantsch, P.; Nash, T.; Schmidke, W. B.; Sliwa, K.; Stanfield, K.; Streetman, M. E.; Willis, S.; Losty, M. J.; Kalbfleisch, G.; Robertson, M.; Blodgett, D. E.; Bracker, S. B.; Hartner, G.F.; Kumar, B. R.; Luste, G. J.; Martin, J. F.; Shahbazian, K.; Sheperd, R. A.; Spalding, W. J.; Zorn, C.

doi:10.1103/physrevlett.52.795

Cited by 75 publications

(30 citation statements)

References 13 publications

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“…Comparison with the data of Ref. [10,11,8,12] on J/Ψ photoproduction shows that the pQCD predictions can be brought to agree with the data within the uncertainties in the gluon distribution of a nucleon. We explain also that the charmonium models differ from QCD for large Q 2 .…”

Section: Introductionsupporting

confidence: 52%

“…Only in the approximation where the mass of c quark tends to infinity, this effect would be small (∼ l 2 t (mcαs) 2 ) where l t is the transverse momentum of the exchanged gluon. One should also notice that in the fixed target experiments [10,11], the recoil proton was not detected and the corresponding cross sections could thus have been overestimated.…”

Section: Absolute Magnitude Of the J/ψ Photoproduction Cross Sectionmentioning

confidence: 99%

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Hard diffractive electroproduction of vector mesons in QCD

1996

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Hard diffractive electroproduction of longitudinally polarized vector mesons is calculated within the leading $\alpha_s\ln{Q^2\over\Lambda_{QCD}^2}$ approximation of QCD using the leading order parton densities within the nucleon. Novel QCD features of the production of excited states and of the restoration of flavor symmetry are analyzed. At the onset of the asymptotic regime, our analysis finds an important role of quark Fermi motion within the diffractively produced vector mesons, and we suggest to use this effect to measure the high momentum tail of the wave function of the vector mesons. We deduce a kinematical boundary for the region of applicability of the decomposition of the hard amplitudes over powers of $Q^2$ and/or a limit on the increase of the cross sections of hard processes at small $x$, and briefly analyze its consequences. We also estimate the nuclear attenuation of the diffractive electroproduction of vector mesons and compare with estimates of the shadowing of the longitudinal structure function.Comment: 64 pages, REVTeX, 16 figures optionally included using epsfig.sty, Revisions in regards to Charmonium photo- and electroproduction, final version to appear in Phys. Rev.

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Section: Introductionsupporting

confidence: 52%

Section: Absolute Magnitude Of the J/ψ Photoproduction Cross Sectionmentioning

confidence: 99%

Hard diffractive electroproduction of vector mesons in QCD

1996

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“…[5], [6] and [9], and the solid lines refer to the inclusion of the "hard physics" by Eq. (38). We can then use the wave functions φ V (z, b), that we constructed in the last two subsections, to calculate the correction factors of Eqs.…”

Section: Vector Meson Productionmentioning

confidence: 99%

“…(50) and (51). [34,35,36] in comparison with experimental data from E401 [37], E516 [38], E687 [39], ZEUS '93 [40], and H1 [17].…”

Section: The Ratio Of υ and J/ψ Photoproductionmentioning

confidence: 99%

Diffractive heavy quarkonium photoproduction and electroproduction in QCD

1998

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Hard diffractive photo-and electroproduction of heavy vector mesons (J/ψ and Υ) is evaluated within the leading α s ln 1 from our earlier work on that subject, also the production of transversely polarized vector mesons is calculated. Special emphasis is placed on the role of the vector meson's qq light-cone wave function. In that context, conventional non-relativistic quarkonium models and a light-front QCD bound state calculation are critically examined and confronted with QCD expectations. Our numerical analysis finds a significant high momentum tail in the latter wave functions and a deviation from the expected asymptotic behavior of φ V (z, b = 0) ∝ z(1 − z). We then design an interpolation to match the quarkonium models at large inter-quark separations with QCD expectations at small distances. We use these results to compare our predictions for the forward differential cross section of J/ψ photo-and electroproduction with recent experimental results from HERA. In addition, our earlier discussion of ρ o electroproduction is updated in light of recent experimental and theoretical enhancements.

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“…Prior to HERA, substantial data were already available on exclusive vector meson production in both DIS and photoproduction (Bauer et al, 1978;Binkley et al, 1982;Denby et al, 1984;Shambroom et al, 1982), with fixed target data continuing to emerge during and beyond the HERA era (Adams et al, 1997;Adolph et al, 2012;Airapetian et al, 2000Airapetian et al, , 2009Alexakhin et al, 2007;Arneodo et al, 1994). DVCS has also recently been studied in detail in fixed target experiments at HERA (Airapetian et al, 2007(Airapetian et al, , 2012a and Jefferson Laboratory (Camacho et al, 2006;Gavalian et al, 2009;Girod et al, 2008).…”

Section: A Introductionmentioning

confidence: 99%

The hadronic final state at HERA

Newman

Wing

2014

Rev. Mod. Phys.

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The hadronic final state in electron-proton collisions at HERA has provided a rich testing ground for development of the theory of the strong force, QCD. In this review, over 200 publications from the H1 and ZEUS Collaborations are summarised. Short distance physics, the measurement of processes at high energy scales, has provided rigorous tests of perturbative QCD and constrained the structure of the proton as well as allowing precise determinations of the strong coupling constant to be made. Non-perturbative or low energy processes have also been investigated and results on hadronisation interpreted together with those from other experiments. Searches for exotic QCD objects, such as pentaquarks, glueballs and instantons have been performed. The subject of diffraction has been re-invigorated through its precise measurement, such that it can now be described by perturbative QCD. After discussion of HERA, the H1 and ZEUS detectors and the techniques used to reconstruct differing hadronic final states, the above subject areas are elaborated. The major achievements are then condensed further in a final section summarising what has been learned.

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Inelastic and Elastic Photoproduction ofJψ(3097)

Cited by 75 publications

References 13 publications

Hard diffractive electroproduction of vector mesons in QCD

Hard diffractive electroproduction of vector mesons in QCD

Diffractive heavy quarkonium photoproduction and electroproduction in QCD

The hadronic final state at HERA

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