Photoproduction of neutral RHO mesons

Alvensleben, H.; Becker, U.; Bertram, William K.; Chen, M.; Cohen, Kenneth J.; Knasel, T.M.; Marshall, R.; Quinn, D. J.; Rohde, M.; Sanders, G. H.; Schubel, H.; Ting, Samuel C.C.

doi:10.1016/0550-3213(70)90123-9

Cited by 41 publications

(26 citation statements)

References 29 publications

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“…The hadron spectrum is obtained from quark and gluon fragmentation in the proportion of parton production given by Eq. (72). These hadrons should balance the vector meson transverse momentum.…”

Section: A Dependence Of Rapidity-gap Production In a A Collisionsmentioning

confidence: 97%

The physics of ultraperipheral collisions at the LHC

et al. 2008

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229 Pages, 121 figuresWe discuss the physics of large impact parameter interactions at the LHC: ultraperipheral collisions (UPCs). The dominant processes in UPCs are photon-nucleon (nucleus) interactions. The current LHC detector configurations can explore small $x$ hard phenomena with nuclei and nucleons at photon-nucleon center-of-mass energies above 1 TeV, extending the $x$ range of HERA by a factor of ten. In particular, it will be possible to probe diffractive and inclusive parton densities in nuclei using several processes. The interaction of small dipoles with protons and nuclei can be investigated in elastic and quasi-elastic $J/\psi$ and $\Upsilon$ production as well as in high $t$ $\rho^0$ production accompanied by a rapidity gap. Several of these phenomena provide clean signatures of the onset of the new high gluon density QCD regime. The LHC is in the kinematic range where nonlinear effects are several times larger than at HERA. Two-photon processes in UPCs are also studied. In addition, while UPCs play a role in limiting the maximum beam luminosity, they can also be used a luminosity monitor by measuring mutual electromagnetic dissociation of the beam nuclei. We also review similar studies at HERA and RHIC as well as describe the potential use of the LHC detectors for UPC measurements

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Section: A Dependence Of Rapidity-gap Production In a A Collisionsmentioning

confidence: 97%

The physics of ultraperipheral collisions at the LHC

et al. 2008

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“…To evaluate the cross-section for ρ photoproduction on heavy nuclei, we need to solve (14,15) with the initial conditions…”

Section: B Evaluation Of the Cross-sectionsmentioning

confidence: 99%

“…From (14,15), it is clear that the reduced wavefunctions only vary with z at fixed impact parameter b in regions where optical potentials (16) Fig. 3 and Fig.…”

Section: B Evaluation Of the Cross-sectionsmentioning

confidence: 99%

“…Before comparing with experiment, we comment briefly on an approximation that gives a useful check on our numerical solutions. In the SVD model, the eikonal equation (14) with f ρρ ′ = 0 can be integrated explicitly and this result is easily generalized to the coupled channel GVD case (14,15) in the high energy limit when e iq ρρ ′ z = 1 .…”

Section: A Simple Approximationmentioning

confidence: 99%

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Nuclear shadowing and ρ photoproduction

Pautz

Shaw

1998

Phys. Rev. C

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photoproduction on complex nuclei is reexamined using a generalized vector dominance model which succesfully predicts the oberved nuclear shadowing in real photoabsorption and deep inelastic scattering. This model is shown to give a good fit to photoproduction data on both nucleons and complex nuclei, in which the disagreement between the measured ␥-coupling and the ␥-coupling required by the simple vector dominance model is eliminated. The N total cross sections required are similar to those predicted by the additive quark model, and the magnitude of the correction to simple vector dominance is consistent with that inferred from the analysis of real photoabsorption and deep inelastic scattering. ͓S0556-2813͑98͒00505-6͔

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“…[ 11] the simplest nondiagonal model was considered with two states ρ and ρ ′ which have the same diagonal amplitudes of scattering off a nucleon and the fixed ratio of coupling constants: f ρ ′ /f ρ = √ 3, while the ratio of the nondiagonal and diagonal amplitudes A(ρ + N → ρ ′ + N)/A(ρ + N → ρ + N) = −ǫ, and the value σ tot ρN were found from the fit to the forward γ + A → ρ + A cross sections measured at ω γ =6.1, 6.6 and 8.8 GeV [ 13]. This model with reasonable values of σ ρN and ǫ allowed to bring the value of f ρ determined from the photoproduction of ρ-mesons off protons at assumption of approximate equality of the cross sections of ρ − N and π − N interactions into a good agreement with the value extracted from the e + e − data thus removing a long standing 20% discrepancy between two determinations.…”

Section: Vector Meson Production Off Nuclei In the General-ized Vectomentioning

confidence: 99%

Coherence effects in diffractive electroproduction from nuclei

Frankfurt¹,

Strikman²,

Zhalov³

2002

Nuclear Physics A

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We argue that study of the cross section of coherent photo(electro) production of ρ, ρ ′ , ...-mesons provides an effective method to probe onset of black body limit(BBL) in the soft and hard QCD interactions. We illustrate the expected features of the onset of BBL using generalized vector dominance model(GVDM). We show that this model describes very well ρ-meson coherent photoproduction at 6 ≤ E γ ≤ 10 GeV. The advantages of the process of coherent dijet production and hard diffractive processes in general for probing the onset of BBL and measuring the light-cone wave function of the photon in a hard scattering regime where decomposition over twists becomes inapplicable are explained. We argue also that the regime of color fluctuations manifests itself at intermediate energies in exclusive and semiexclusive photoproduction of vector mesons and that the color transparency(CT) should reveal itself in these processes at Q 2 of the order of a few GeV 2 .

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Photoproduction of neutral RHO mesons

Cited by 41 publications

References 29 publications

The physics of ultraperipheral collisions at the LHC

The physics of ultraperipheral collisions at the LHC

Nuclear shadowing and ρ photoproduction

Coherence effects in diffractive electroproduction from nuclei

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