High-energy photoproduction

Abbiendi, G.

doi:10.1007/bf02880922

Cited by 6 publications

(10 citation statements)

References 181 publications

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“…Using for B 0,pP ≈ 2.4GeV −2 and for α ′ P ≈ 0.25GeV −2 , as found in [38,39], one gets for LHC energies (s = (2 × 7TeV) 2 ,s 0 = 1GeV 2 ) b 0 ≈ 1 fm, which is small compared to the nuclear radius.…”

Section: General Survey Of Peripheral Collisionssupporting

confidence: 53%

“…This is made possible by the large flux of quasi-real photons from the electron (positron) beam (for a review see [38]). The obtained γp center-of-mass energies (up to W γp ≈ 200 GeV) are an order of magnitude larger than those reached by fixed target experiments.…”

Section: γ-A Interactionsmentioning

confidence: 99%

“…From Fig. 17 of [38] or Fig. 5 of [75] one has for σ 0 ≈ 50 µb for the total hadronic cross section, 5 µb for V = ρ, 0.5 µb for V = ω, φ and 10 −3 µb for V = J/Ψ.…”

Section: γ-A Interactionsmentioning

confidence: 99%

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Photon-photon physics in very peripheral collisions of relativistic heavy ions

Baur

Hencken

Trautmann

1998

J. Phys. G: Nucl. Part. Phys.

233

356

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In central collisions at relativistic heavy ion colliders like the Relativistic Heavy Ion Collider RHIC/Brookhaven and the Large Hadron Collider LHC (in its heavy ion mode) at CERN/Geneva, one aims at detecting a new form of hadronic matter -the Quark Gluon Plasma. It is the purpose of this review to discuss a complementary aspect of these collisions, the very peripheral ones. Due to coherence, there are strong electromagnetic fields of short duration in such collisions. They give rise to photon-photon and photon-nucleus collisions with high flux up to an invariant mass region hitherto unexplored experimentally. After a general survey photon-photon luminosities in relativistic heavy ion collisions are discussed. Special care is taken to include the effects of strong interactions and nuclear size. Then photon-photon physics at various γγ-invariant mass scales is discussed. The region of several GeV, relevant for RHIC is dominated by QCD phenomena (meson and vector meson pair production). Invariant masses of up to about 100 GeV can be reached at LHC, and the potential for new physics is discussed. Photonuclear reactions and other important background effects, especially diffractive processes are also discussed. A special chapter is devoted to lepton-pair production, especially electron-positron pair production; due to the strong fields new phenomena, especially multiple e + e − pair production, will occur there.

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Section: General Survey Of Peripheral Collisionssupporting

confidence: 53%

Section: γ-A Interactionsmentioning

confidence: 99%

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Photon-photon physics in very peripheral collisions of relativistic heavy ions

Baur

Hencken

Trautmann

1998

J. Phys. G: Nucl. Part. Phys.

233

356

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“…4(d) is that the cross section for this case does not include the direct component since our calculation are performed only to leading order. It is known, however, that in next-to-leading order the direct component presents appreciable contribution for x γ > 0.75 [26].…”

Section: Diffractive Jets and Zeus Datamentioning

confidence: 96%

Analysis of the diffractive production ofW’s and dijets at the DESY HERA and Fermilab Tevatron colliders

Covolan

Soares

1999

Phys. Rev. D

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Hadronic processes in which hard diffractive production takes place have been observed and analyzed in collider experiments for several years. The experimental rates of diffractive W 's and dijets measured at the Tevatron and the cross sections of diffractively produced dijets recently obtained at the HERA experiment are the object of this analysis. We use the Pomeron structure function obtained from the HERA data by two different approaches to calculate the rates and cross sections for these processes. The comparison of theoretical predictions with the measured values reveals some discrepancies that make evident conceptual difficulties with such approaches. A new version of the Ingelman-Schlein model is proposed as an attempt to overcome such difficulties and make theory and data compatible. PACS: 12.40.Nn, 13.60.Hb, 13.85.Qk,13.87.-a * To be published in Physical Review D.

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“…Refs. [1]- [3]; a comprehensive earlier review on this subject can be found in Ref. [4]) as a unique testfield for diffraction, an interface between "soft" and "hard" physics, with three independent kinematical variables, the c.m.s energy W = √ s, the transferred momentum √ −t and the virtuality of the external particle(s) Q 2 = −q 2 involved simultaneously.…”

Section: Introductionmentioning

confidence: 99%

Photoproduction of heavy vector mesons at HERA – a test field for diffraction

Fiore¹,

Jenkovszky²,

Paccanoni³

1999

Eur. Phys. J. C

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Exclusive diffractive photoproduction of heavy vector mesons (V=φ, J/ψ and Υ) at HERA is studied in a model employing a dipole Pomeron exchange (P) with an inelastic γP V vertex. The model is fitted to the data on dσ/dt, B and σ el for Q 2 = 0 and beyond the threshold region. The elastic cross sections for both φ and J/ψ photoproduction show a moderate increase within the HERA energy region. The flattening of the slope B(s) (little or no shrinkage) for J/ψ is not correlated with the slope of the Pomeron trajectory. Estimates for Υ photoproduction at HERA are given.

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High-energy photoproduction

Cited by 6 publications

References 181 publications

Photon-photon physics in very peripheral collisions of relativistic heavy ions

Photon-photon physics in very peripheral collisions of relativistic heavy ions

Analysis of the diffractive production ofW’s and dijets at the DESY HERA and Fermilab Tevatron colliders

Photoproduction of heavy vector mesons at HERA – a test field for diffraction

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