Photoproduction of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>ψ</mml:mi></mml:math>Particles

Camerini, U.; Learned, J. G.; Prepost, R.; Spencer, C.M.; Wiser, D. E.; Ash, W. W.; Anderson, R. L.; Ritson, D. M.; Sherden, D. J.; Sinclair, C. K.

doi:10.1103/physrevlett.35.483

Cited by 192 publications

(184 citation statements)

References 10 publications

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“…The results from the present analysis are shown together with those from earlier fixed target experiments [17,18,19,20,21]. The ratios from the fixed target experiments have been corrected using the latest decay branching ratios.…”

Section: Figurementioning

confidence: 83%

“…The J/ψ quasi-elastic (z > 0.95) photo-production cross-section at W γp = 80 GeV is (119.5 ± 11.2 ± 12.0) nb [3], yielding a ratio: Figure 4 contains a compilation of measurements from fixed target experiments of the ratio of the photon-nucleon cross-sections for the production of ψ(2S) and J/ψ mesons: three photoproduction experiments at Q 2 = 0 GeV 2 (deuterium target [17] SLAC, lithium target [18] NA14, and deuterium target [19] E401) plus muo-production experiments on an iron target [20](EMC) and more recently on tin and carbon [21](NMC). Of these the deuterium target data samples were restricted to events in which the decay products of the vector mesons were the only tracks detected; in the lithium and iron target data some contribution from the kinematic region of lower z was included.…”

Section: The Cross-section Ratio σ [ψ(2s)]/σ [J/ψ]mentioning

confidence: 99%

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Photo-production of ψ(2S) mesons at HERA

Adloff¹,

Aïd²,

Anderson³

et al. 1998

Physics Letters B

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Quasi-elastic (z > 0.95) photo-production of ψ(2S) mesons has been observed at HERA for photon-proton centre-of-mass energies in the range 40 to 160 GeV. The ψ(2S) mesons were identified through their decays to ℓ + ℓ − and to J/ψ π + π − , where the J/ψ subsequently decays to ℓ + ℓ − , the lepton ℓ being either a muon or an electron. The cross-section for quasi-elastic photoproduction was measured to be (18.0 ± 2.8(stat) ± 3.0(syst)) nb at a photon-proton centre-of-mass energy of 80 GeV. The ratio of the ψ(2S) to J/ψ quasi-elastic cross-sections is (0.150 ± 0.027(stat) ± 0.022(syst)).

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Section: Figurementioning

confidence: 83%

Section: The Cross-section Ratio σ [ψ(2s)]/σ [J/ψ]mentioning

confidence: 99%

Photo-production of ψ(2S) mesons at HERA

Adloff¹,

Aïd²,

Anderson³

et al. 1998

Physics Letters B

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“…The data show that the nucleon's gluonic transverse radius at x ∼ 10 −1 is smaller than the transverse charge (Dirac) radius and increases slowly toward small x; see [1065,1109] for details 6.11.2. J/ψ photoproduction at low energy Measurements of exclusive J/ψ photoproduction at lower energies were performed in the Fermilab broadband beam experiment [1070], which detected the recoiling proton, as well as several other experiments [1071,1072]. The few existing data suggest that the two-gluon exchange mechanism of Fig.…”

Section: Charmonium Photoproduction Facilitiesmentioning

confidence: 99%

Heavy quarkonium: progress, puzzles, and opportunities

Brambilla¹,

Eidelman²,

Heltsley³

et al. 2011

Advances in the Physics of Particles and Nuclei

103

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A golden age for heavy quarkonium physics dawned a decade ago, initiated by the confluence of exciting advances in quantum chromodynamics (QCD) and an explosion of related experimental activity. The early years of this period were chronicled in the Quarkonium Working Group (QWG) CERN Yellow Report (YR) in 2004, which presented a comprehensive review of the status of the field at that time and provided specific recommendations for further progress. However, the broad spectrum of subsequent breakthroughs, surprises, and continuing puzzles could only be partially anticipated. Since the release of the YR, the BESII program concluded only to give birth to BESIII; the B-factories and CLEO-c flourished; quarkonium production and polarization measurements at HERA and the Tevatron matured; and heavy-ion collisions at RHIC have opened a window on the deconfinement regime. All these experiments leave legacies of quality, precision, and unsolved mysteries for quarkonium physics, and therefore beg for continuing investigations at BESIII, the LHC, RHIC, FAIR, the Super Flavor and/or Tau-Charm factories, JLab, the ILC, and beyond. The list of newly-found conventional states expanded to include hc(1P ), χc2(2P ), B + c , and η b (1S). In addition, the unexpected and still-fascinating X(3872) has been joined by * Editors † Section coordinators ‡ Corresponding author: bkh2@cornell.edu more than a dozen other charmonium-and bottomonium-like "XY Z" states that appear to lie outside the quark model. Many of these still need experimental confirmation. The plethora of new states unleashed a flood of theoretical investigations into new forms of matter such as quark-gluon hybrids, mesonic molecules, and tetraquarks. Measurements of the spectroscopy, decays, production, and in-medium behavior of cc, bb, and bc bound states have been shown to validate some theoretical approaches to QCD and highlight lack of quantitative success for others. Lattice QCD has grown from a tool with computational possibilities to an industrialstrength effort now dependent more on insight and innovation than pure computational power. New effective field theories for the description of quarkonium in different regimes have been developed and brought to a high degree of sophistication, thus enabling precise and solid theoretical predictions. Many expected decays and transitions have either been measured with precision or for the first time, but the confusing patterns of decays, both above and below open-flavor thresholds, endure and have deepened. The intriguing details of quarkonium suppression in heavy-ion collisions that have emerged from RHIC have elevated the importance of separating hotand cold-nuclear-matter effects in quark-gluon plasma studies. This review systematically addresses all these matters and concludes by prioritizing directions for ongoing and future efforts.

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“…Two experiments reported the t-dependence in this range. The SLAC data [17] at E γ = 19 GeV correspond to −t min = 0.087 GeV 2 . We find them in a good agreement with Eq.…”

Section: Comparison With the Datamentioning

confidence: 99%

Two-gluon form factor of the nucleon andJ/ψphotoproduction

Frankfurt¹,

Strikman²

2002

Phys. Rev. D

109

136

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We argue that the t-dependence of the two-gluon form factor of the nucleon should be given by Γ(t) = (1 − t/m 2 2g ) −2 with m 2 2g ≈ 1GeV 2 . We demonstrate that this form provides a good description of the t-dependence of the cross section of the elastic photoproduction of J/ψ-mesons between the threshold region of E γ = 11 GeV (Cornell), E γ = 19 GeV (SLAC) and E γ = 100 GeV (FNAL) including the strong energy dependence of the t-slope. It is also well matched with the recent HERA data. The same assumption explains also the t-dependence of φ-meson electroproduction near threshold at W = 2.3 GeV, Q 2 = 1.0 GeV 2 . Theoretical expectationsIt was demonstrated in [1] for the case of small x and in [2] in a general case that in the limit of large Q 2 the t-dependence of the process γ * L + N → V + N at fixed x is factorized into the convolution of a hard interaction block calculable in perturbative QCD, the short-distance qq wave function of the meson, and the generalized/skewed parton distribution (GPD) in the nucleon.In the scaling limit the t-dependence is originating solely from the GPD's since the meson wave function is highly squeezed in the direction transverse to the reaction axis. In the case of the valence quark exchanges these t-dependences are constrained by the sum rules for unpolarized [3] and polarized quarks [4] and could be also modeled in the chiral soliton models, see review in [5]. The t-dependence of GPD's provides unique information about the impact parameter distribution of the partons in nucleons. The knowledge of the transverse gluon distribution is especially important since it provides a key ingredient for the understanding of relative importance of soft and hard physics for high energy nucleonnucleon interactions at different impact parameters and has to be implemented in realistic Monte Carlo generators of nucleon-nucleon collisions at collider energies.In this paper we will first discuss theoretical expectations for the t-dependence of gluon GPD's. Next we will use the 11 ≤ E γ ≤ 100GeV data to check these expectations and hence 1

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Photoproduction of theψParticles

Abstract: The s and? dependence of incoherent #(3100) photoproduction from deuterium has been measured at the Stanford Linear Accelerator Center. #(3700) photoproduction and #(3100) photoproduction from hydrogen have also been measured.

Cited by 192 publications

References 10 publications

Photo-production of ψ(2S) mesons at HERA

Photo-production of ψ(2S) mesons at HERA

Heavy quarkonium: progress, puzzles, and opportunities

Two-gluon form factor of the nucleon andJ/ψphotoproduction

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