Nuclear shadowing and ρ photoproduction

Pautz, Andreas; Shaw, Graham

doi:10.1103/physrevc.57.2648

Cited by 30 publications

(39 citation statements)

References 26 publications

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“…V ′ + A → V + A, are usually small [67], and are often neglected. The cross section is then (t is the momentum transfer from the target nucleus squared and dσ/dt = |A| 2 )…”

Section: A Exclusive Particle Productionmentioning

confidence: 99%

Physics of Ultra-Peripheral Nuclear Collisions

Bertulani

Klein

Nystrand

2005

Annu. Rev. Nucl. Part. Sci.

463

380

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Moving highly-charged ions carry strong electromagnetic fields that act as a field of photons. In collisions at large impact parameters, hadronic interactions are not possible, and the ions interact through photon-ion and photon-photon collisions known as ultra-peripheral collisions (UPC). Hadron colliders like the Relativistic Heavy Ion Collider (RHIC), the Tevatron and the LargeHadron Collider (LHC) produce photonuclear and two-photon interactions at luminosities and energies beyond that accessible elsewhere; the LHC will reach a γp energy ten times that of the Hadron-Electron Ring Accelerator (HERA). Reactions as diverse as the production of antihydrogen, photoproduction of the ρ 0 , transmutation of lead into bismuth and excitation of collective nuclear resonances have already been studied. At the LHC, UPCs can study many types of 'new physics.'

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“…V ′ + A → V + A, are usually small [67], and are often neglected. The cross section is then (t is the momentum transfer from the target nucleus squared and dσ/dt = |A| 2 )…”

Section: A Exclusive Particle Productionmentioning

confidence: 99%

Physics of Ultra-Peripheral Nuclear Collisions

Bertulani

Klein

Nystrand

2005

Annu. Rev. Nucl. Part. Sci.

463

380

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“…Unless those (i.e., γ γV s) are known for the higher ρ meson states, they cannot be incorporated in the GVMD model to describe photon induced reactions. As done by Pautz and Shaw [9], the contributions of all higher ρ meson states are approximated with that of an effective state (called ρ ′ meson) whose mass and coupling (to photon) constant can be expressed by those of the ρ meson. The calculated results due to them account very good the measured ρ meson photoproduction data in the multi-GeV region.…”

Section: Resultsmentioning

confidence: 99%

“…γ γρ [9,22]. The scattering amplitudes are related to each other as f ρ ′ N →ρ ′ N = f ρN →ρN , f ρ ′ N →ρN = f ρN →ρ ′ N = −ǫf ρN →ρN , with ǫ = 0.18 [9,22].…”

Section: Resultsmentioning

confidence: 99%

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Shadowing in low-energy photonuclear reactions

Das

2017

Phys. Rev. C

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The photonuclear reaction in the multi-GeV region occurs because of the electromagnetic and hadronic interaction. The later originates due to the hadronic fluctuation, i.e., vector meson, of the photon. The total cross section of the reaction is shadowed because of the vector meson nucleus (hadronic) interaction. To estimate it quantitatively, the cross section of the photonuclear reaction was calculated in the low energy region (∼ 1 − 3 GeV) using simple vector meson dominance (SVMD) model, i.e., the low lying vector mesons (ρ 0 , ω and φ mesons) were considered. The nuclear shadowing is reinvestigated using generalized vector meson (GVMD) model, where the higher ρ meson effective state (ρ ′ meson) is taken into account along with the low lying vector mesons. Using GVMD model, the shadowing and the total cross section of the photonuclear reaction are calculated in the above mentioned energy region. The calculated results have been compared with the measured spectra.

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“…Depending on the size of the nucleus we have used two different density distributions; for A < 16 the shell model density profile of Ref. [32] and for heavier nuclei (A > 16) the density profile from Ref. [33] has been used.…”

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confidence: 99%

Shadowing in photoabsorption: Role of in-medium hadrons

Alam

Ghosh²,

Roy³

et al. 2002

Phys. Rev. C

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We study the effects of in-medium hadronic properties on shadowing in photon-nucleus interactions in Glauber model as well as in the multiple scattering approach. A reasonable agreement with the experimental data is obtained in a scenario of downward spectral shift of the hadrons. Shadowing is found to be insensitive to the broadening of the spectral functions. An impact parameter dependent analysis of shadowing might shed more light on the role of in-medium properties of hadrons. Nos. : 25.20.Dc,25.40.Ep,24.10.Ht,12.40.Vv Theoretical studies based on various models of hadronic interaction predict a reduction in the mass of hadrons at or above nuclear matter density [1,2]. The observation of enhanced dilepton production in the low invariant mass domain in the heavy ion collision experiments [3] does seem to indicate a non-trivial modification of the properties of light vector mesons, particularly the ρ meson, in hot and/dense medium [4]. However, the complicated dynamics both in the initial as well as final states in these experiments inhibits a firm conclusion about nuclear medium effects at present. PACSOn the other hand, the experiments like photoabsorption on nuclei provide much cleaner systems for the study of in-medium properties of mesons [5]. With the availability of better photon beams, there has been a renewed interest in the photo-absorption processes.The phenomena of shadowing plays an important role in the photo-nuclear reactions. The photo-nuclear data at lower energies, for different nuclei, seem to indicate an early onset of shadowing [6,7]. In ref.[8] this feature has been interpreted as a signature for a lighter ρ-meson in the medium, where the shadowing effect was evaluated within a Glauber-Gribov multiple scattering theory [9,10,11] and generalized vector meson dominance (VMD). In contrast the authors in ref. [12] have claimed that the early onset of shadowing can be understood within simple Glauber theory [11,13,14,15] if one takes the negative real part of the ρN scattering amplitude into account which corresponds to a higher effective inmedium ρ meson mass. In a subsequent paper [16], the authors have concluded that the enhancement of shadowing at low energies occurs due to lighter ρ mesons as well as intermediate π 0 produced in non-forward scattering. In the backdrop of these different inferences, we have made an attempt to understand the role of in-medium properties of hadrons in the phenomenon of shadowing in photo-nuclear reactions. The shadowing in photonnucleus reactions can be written as,where σ γA = Aσ γN + δσ γA consists of the incoherent scattering of the photon from individual nucleons and a correction due to the coherent interaction with several nucleons.The later has been evaluated using both multiple scattering approach [10,16,17] as well as Glauber's formula along with VMD [18]. Resonance contribution to γ − A cross-section for photon energy < ∼ 1.2 GeV has been estimated by using the prescription given in [19].Let us first consider the in-medium effects on the kinematic...

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Nuclear shadowing and ρ photoproduction

Cited by 30 publications

References 26 publications

Physics of Ultra-Peripheral Nuclear Collisions

Physics of Ultra-Peripheral Nuclear Collisions

Shadowing in low-energy photonuclear reactions

Shadowing in photoabsorption: Role of in-medium hadrons

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