Hadronic aspects of photon-nucleus interactions

Weise, W.

doi:10.1016/0370-1573(74)90005-2

Cited by 59 publications

(24 citation statements)

References 45 publications

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“…We thus turn our attention to e + e − → µ + µ − . In modelling the strong interaction correction to the photon propagator, VMD assumes that the strong interaction contribution is saturated by the spectrum of vector meson resonances [12]. Therefore, in principle, we can extract information on the vector meson parameters (independently of the e + e − → π + π − fit) without having to worry about non-resonant processes.…”

Section: Introductionmentioning

confidence: 99%

New results in $\rho^0$ meson physics

Benayoun¹,

Eidelman²,

Maltman³

et al. 1998

Eur. Phys. J. C

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We compare the predictions of a range of existing models based on the Vector Meson Dominance hypothesis with data on e + e − → π + π − and e + e − → µ + µ − 1 Permanent address. 2 Present address.cross-sections and the phase and near-threshold behavior of the timelike pion form factor, with the aim of determining which (if any) of these models is capable of providing an accurate representation of the full range of experimental data. We find that, of the models considered, only that proposed by Bando et al. is able to consistently account for all information, provided one allows its parameter a to vary from the usual value of 2 to 2.4. Our fit with this model gives a point-like coupling γπ + π − of magnitude −e/6, while the common formulation of VMD excludes such a term. The resulting values for the ρ mass and π + π − and e + e − partial widths as well as the branching ratio for the decay ω → π + π − obtained within the context of this model are consistent with previous results.

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Section: Introductionmentioning

confidence: 99%

New results in $\rho^0$ meson physics

Benayoun¹,

Eidelman²,

Maltman³

et al. 1998

Eur. Phys. J. C

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“…With the assumption that the hadronic forward amplitudes f hh are dominated by their imaginary parts (see [34]), we can use the optical theorem to replace…”

Section: Glauber-gribov Multiple Scattering Theorymentioning

confidence: 99%

Phenomenology of nuclear shadowing in deep-inelastic scattering

Piller

Ratzka

Weise

1995

Z. Physik A - Hadrons and Nuclei

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101

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We investigate shadowing effects in deep-inelastic scattering from nuclei at small values x < 0.1 of the Bjorken variable. Unifying aspects of generalized vector meson dominance and color transparency we first develop a model for deep-inelastic scattering from free nucleons at small x. In application to nuclear targets we find that the coherent interaction of quark-antiquark fluctuations with nucleons in a nucleus leads to the observed shadowing at x < 0.1. We compare our results with most of the recent data for a large variety of nuclei and examine in particular the Q 2 dependence of the shadowing effect. While the coherent interaction of low mass vector mesons causes a major part of the shadowing observed in the Q 2 range of current experiments, the coherent scattering of continuum quark-antiquark pairs is also important and guarantees a very weak overall Q 2 dependence of the effect. We also discuss shadowing in deuterium and its implications for the quark flavor structure of nucleons. Finally we comment on shadowing effects in high-energy photon-nucleus reactions with real photons.To be published in Z. Phys. A.

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“…At these high energies the photon does not interact purely electromagnetically with the nucleus but also by its hadronic structure [24] resulting from vacuum fluctuation of the photon such as p~s r+sr, p, w, P, qq, qqg, etc. For an excellent report we refer to [25]. For this extrapolation purpose we utilize the proton photoabsorption cross section, which has been measured extensively for (u & 200 GeV and which recently has been extended at HERA up to u 20 TeV [14].…”

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confidence: 99%

“…For this extrapolation purpose we utilize the proton photoabsorption cross section, which has been measured extensively for (u & 200 GeV and which recently has been extended at HERA up to u 20 TeV [14]. As a first prescription w. e employ the extrapolation [25,26] The constant C is identified with the measured photoabsorption cross section for Pb at cuq --80 GeV, i.e. , C = o.…”

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confidence: 99%

Electromagnetic dissociation of Pb nuclei in peripheral ultrarelativistic heavy-ion collisions

Vidović

Greiner

Soff³

1993

Phys. Rev. C

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We calculate the total electromagnetic dissociation cross section in peripheral heavy-ion collisions Pb + Pb for the planned colliders the Brookhaven Relativistic Heavy Ion Collider, the CERN Large Hadron Collider, and the Superconducting Super Collider. The two nuclei interact via their Lorentz contracted electromagnetic fields leading to nuclear disintegration. We employ an impactparameter-dependent version of the equivalent photon method with experimental photon-nucleus dissociation cross sections. The hadronic structure of the photon at large equivalent photon energies has been taken into account. In particular, we stress unitarity conservation of the dissociation probability for small impact parameters.PACS number(s): 25.75.+r The planned heavy-ion colliders RHIC (Brookhaven Relativistic Heavy Ion Collider), LHC (Large HadronCollider) at CERN, and SSC (Superconducting Super Collider) in Texas will open exciting possibilities for fundamental physical studies. Besides the formation of a quark-gluon plasma and its investigation in central collisions, the particle production will be of interest not only for central but especially in peripheral collisions [1,2], where the two nuclei are assumed to exhibit no overlap.

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Hadronic aspects of photon-nucleus interactions

Cited by 59 publications

References 45 publications

New results in $\rho^0$ meson physics

New results in $\rho^0$ meson physics

Phenomenology of nuclear shadowing in deep-inelastic scattering

Electromagnetic dissociation of Pb nuclei in peripheral ultrarelativistic heavy-ion collisions

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