Diffractive Υ production at the Tevatron and LHC

Cox, B. E.; Forshaw, Jeffrey R.; Sandapen, Ruben

doi:10.1088/1126-6708/2009/06/034

Cited by 44 publications

(53 citation statements)

References 33 publications

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“…Additional pA data would help this study by allowing cross checks between pA and pp interactions as well as between AA and pA interactions. Another possibility, for pp collisions, is to use Roman pots or other small-angle detectors to tag the outgoing protons [1001]. The proton that emitted the photon will usually have lower p T .…”

Section: Transverse Momentum Spectramentioning

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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Section: Transverse Momentum Spectramentioning

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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“…point is the following expression for the imaginary part of the vector meson photo-production scattering amplitude [25,26] mA…”

Section: The Vector Meson Photo-production Impact Factormentioning

confidence: 99%

“…For the scalar parts of the wave functions φ T,L (r, z), we follow closely [14] and employ the boosted Gaussian wave-functions with the Brodsky-Huang-Lepage prescription [27]. For the ground state vector meson (1s) the scalar function φ T,L (r, z), has the following general form [26,28],…”

Section: The Vector Meson Photo-production Impact Factormentioning

confidence: 99%

BFKL evolution and the growth with energy of exclusiveJ/Ψandϒphotoproduction cross sections

2016

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We investigate whether the Balitsky-Fadin-Kuraev-Lipatov (BFKL) low x evolution equation is capable to describe the energy dependence of the exclusive photo-production cross-section of vector mesons J/Ψ and Υ on protons. Such cross-sections have been measured by both HERA experiments H1 and ZEUS in electron-proton collisions and by LHC experiments ALICE, CMS and LHCb in ultra-peripheral proton-proton and ultraperipheral proton-lead collisions. Our approach provides a perturbative description of the rise with energy and relies only on a fit of the initial transverse momentum profile of the proton impact factor, which can be extracted from BFKL fits to inclusive HERA data. We find that BFKL evolution is capable to provide a very good description of the energy dependence of the current data set, while the available fits of the proton impact factor require an adjustment in the overall normalization.

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“…a very good description of exclusive diffractive HERA data [11,12,14]. For the ground state vector meson (1s) and its first excited state 2s, the scalar function φ T,L (r, z), has the following general form [62,63],…”

Section: Exclusive Diffractive Processes In the Colour-dipole Formentioning

confidence: 99%

Exclusive vector meson production at high energies and gluon saturation

Rezaeian

2014

Proceedings of XXII. International Workshop on Deep-Inelastic Scattering and Related Subjects — PoS(DIS2014)

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We systematically study exclusive diffractive (photo) production of vector mesons (J/ψ, ψ(2s), φ and ρ) off protons in high-energy collisions and investigate whether the production is a sensitive probe of gluon saturation. We confront saturation-based results for diffractive ψ(2s) and ρ production at HERA and J/ψ photoproduction with all available data including recent ones from HERA, ALICE and LHCb, finding good agreement. In particular, we show that the t-distribution of differential cross sections of photoproduction of vector mesons offers a unique opportunity to discriminate among saturation and non-saturation models. This is due to the emergence of a pronounced dip (or multiple dips) in the t-distribution of diffractive photoproduction of vector mesons at relatively large, but potentially accessible |t| that can be traced back to the unitarity features of colour dipole amplitude in the saturation regime. We show that in saturation models the dips in t-distribution recede towards lower |t| with decreasing mass of the vector meson, increasing energy or decreasing Bjorken-x, and decreasing virtuality Q. We provide various predictions for exclusive (photo) production of different vector mesons including the ratio of ψ(2s)/J/ψ at HERA, the LHC, and future colliders.

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Diffractive Υ production at the Tevatron and LHC

Cited by 44 publications

References 33 publications

Heavy quarkonium: progress, puzzles, and opportunities

Heavy quarkonium: progress, puzzles, and opportunities

BFKL evolution and the growth with energy of exclusiveJ/Ψandϒphotoproduction cross sections

Exclusive vector meson production at high energies and gluon saturation

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