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

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

doi:10.1103/physrevlett.38.263

Cited by 146 publications

(81 citation statements)

References 6 publications

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“…We express gV (0) as gV (0) = κgV (q 2 ) by using suppression factor κ. In the ψ cases, we take κ ≃ 0.4 [17,18], and in the ρ, ω cases, we take κ ≃ 1.0 [19,20]. Then the long distance contributions mediated by ψ, ρ, ω are (76) and if we calculate the form factor of K * |sγ µ (1 − γ 5 )b | B , the long distance contributions become as follows:…”

Section: A Factorizable Contributionmentioning

confidence: 99%

CPasymmetry, branching ratios, and isospin breaking effects ofB→K*γwith the perturbative QCD approach

2005

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The main contribution to the radiative B → K * γ mode is from penguin operators which are quantum corrections. Thus, this mode may be useful in the search for physics beyond the standard model. In this paper, we compute the branching ratio, direct CP asymmetry, and isospin breaking effects within the standard model in the framework of perturbative QCD, and discuss how new physics might show up in this decay.

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Section: A Factorizable Contributionmentioning

confidence: 99%

CPasymmetry, branching ratios, and isospin breaking effects ofB→K*γwith the perturbative QCD approach

2005

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“…The small coherence and formation lengths allow extraction of the J/ψ-nucleon cross sections from the A-dependence of the J/ψ photoproduction cross section with minimal corrections to the colortransparency effects. The only such experiment done at sufficiently low energies [1078] obtained 3.5 ± 0.9 mb; the signal was extracted from a single-muon transverse momentum spectrum and the background level was not well understood. A new experiment at JLab can reduce the statistical and systematic errors by a factor of three.…”

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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“…One such constraint is the J/ψ absorption cross section by a nucleon, as this process can be viewed as the absorption of J/ψ by the virtual pion and rho meson cloud of the nucleon [20,21]. From J/ψ production in photon-and proton-nucleus reactions, the extracted cross section for J/ψ absorption by a nucleon is a few mb [22].…”

Section: Nuclear Absorptionmentioning

confidence: 99%

Charmonium absorption in the meson-exchange model

Lin

Ko²

2003

Nuclear Physics A

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We review the meson-exchange model for charmonium absorption by hadrons. This includes the construction of the interaction Lagrangians, the determination of the coupling constants, the introduction of form factors, and the predicted cross sections for J/ψ absorption by both mesons and nucleons. We further discuss the effects due to anomalous parity interactions, uncertainties in form factors, constraints from chiral symmetry, and the change of charmed meson mass in medium on the cross sections for charmonium absorption in hadronic matter.

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Measurement of theADependence ofJψPhotoproduction

Cited by 146 publications

References 6 publications

CPasymmetry, branching ratios, and isospin breaking effects ofB→K*γwith the perturbative QCD approach

CPasymmetry, branching ratios, and isospin breaking effects ofB→K*γwith the perturbative QCD approach

Heavy quarkonium: progress, puzzles, and opportunities

Charmonium absorption in the meson-exchange model

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