<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>Q</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>dependence of the hard diffractive photoproduction of a vector meson or photon and the range of PQCD validity

Ginzburg, Ilya F.; Ivanov, D. Yu.

doi:10.1103/physrevd.54.5523

Cited by 46 publications

(62 citation statements)

References 28 publications

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“…Eq. (9). There are thus good prospects for determining the nature of the dominant t-channel exchange from experimental data.…”

Section: Discussionmentioning

confidence: 99%

“…2c is ∝ŝ 1 due to two gluon exchange in the t-channel. At even higher orders repeated gluon ladders are expected to build up hard Pomeron exchange in the BFKL approximation, as has been studied extensively for the present process [9][10][11][12]. It is worthwhile to explore at what value ofŝ/ − t the higher order diagrams begin to dominate.…”

Section: Introductionmentioning

confidence: 99%

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Semi-exclusive production of photons at HERA

2000

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We study the feasibility of measuring semi-exclusive photon production γ + p → γ + Y at HERA. The cross section of photons produced at large transverse momenta, recoiling off an inclusive system Y of limited mass, can without photon isolation cuts be simply expressed in terms of hard pQCD subprocesses and standard target parton distributions. With the help of event generators we identify the kinematic region where quark and gluon fragmentation processes can be neglected. The cross section in this semi-exclusive region is large enough to be measured with an upgraded HERA luminosity of L = 100 pb −1 .The subprocesses of lowest order in αs are suppressed at low recoil masses MY , compared to higher order gluon exchange, i.e. BFKL contributions. The distinct MY -dependence makes it possible to determine experimentally the kinematic range where the higher order processes dominate.

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“…Eq. (9). There are thus good prospects for determining the nature of the dominant t-channel exchange from experimental data.…”

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Semi-exclusive production of photons at HERA

2000

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“…We stress that our approach to photoproduction requires high energies, large momentum transfer and small values of | cos θ|. If s/ − t 1 Pomeron exchange becomes dominant, see for instance [46].…”

Section: Photoproduction Of Mesonsmentioning

confidence: 99%

Large momentum transfer electroproduction of mesons

2000

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Assuming the proton's light-cone wave function to be dominated by small parton virtualities and small intrinsic transverse momenta, we show that the electroproduction amplitudes at large momentum transfer factorize into parton-level subprocess amplitudes and form factors representing 1/xmoments of skewed parton distributions. On the basis of a wave function overlap model for the form factors we present detailed predictions for the electroproduction cross sections. We also comment on large momentum transfer photoproduction.

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“…Good agreement with the fixed-target and HERA measurements of the energy dependence of the J/ψ photoproduction cross sections was found at the level of present experimental uncertainties. [98] have discussed the hard diffractive photoproduction of light mesons and photons for both real and virtual initial-state photons in the approximation that the transverse momentum of the final-state meson or photon exceed the QCD confinement scale. They quantify the region of pQCD validity for the production of ρ 0 and φ mesons and for the hard Compton effect.…”

Section: Calculations Based On Perturbative Quantum Chromodynamicsmentioning

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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Q2dependence of the hard diffractive photoproduction of a vector meson or photon and the range of PQCD validity

Cited by 46 publications

References 28 publications

Semi-exclusive production of photons at HERA

Semi-exclusive production of photons at HERA

Large momentum transfer electroproduction of mesons

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

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