Diffraction scattering and the parton structure of hadrons

Miettinen, H.I.; Pumplin, Jon

doi:10.1103/physrevd.18.1696

Cited by 194 publications

(239 citation statements)

References 24 publications

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“…Since a hadron can be excited, it cannot be an eigenstate of the interaction, and can be expanded over the complete set of eigen states |α [7][8][9]:…”

Section: Quantum Mechanics Of Diffractionmentioning

confidence: 99%

Diffraction in QCD

Kopeliovich¹,

Potashnikova²,

Schmidt³

2007

Braz. J. Phys.

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This lecture presents a short review of the main features of diffractive processes and QCD inspired models. It includes the following topics: (1) Quantum mechanics of diffraction: general properties; (2) Color dipole description of diffraction; (3) Color transparency; (4) Soft diffraction in hard reactions: DIS, Drell-Yan, Higgs production; (5) Why Pomerons interact weakly; (6) Small gluonic spots in the proton; (7) Diffraction near the unitarity bound: the Goulianos-Schlein "puzzle"; (8) Diffraction on nuclei: diffractive Color Glass; (9) CGC and gluon shadowing.

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“…Since a hadron can be excited, it cannot be an eigenstate of the interaction, and can be expanded over the complete set of eigen states |α [7][8][9]:…”

Section: Quantum Mechanics Of Diffractionmentioning

confidence: 99%

Diffraction in QCD

Kopeliovich¹,

Potashnikova²,

Schmidt³

2007

Braz. J. Phys.

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“…As a result, the cross section of diffraction is zero at t = 0. At the same time, the diffractive cross section (dp → pnp) is not suppressed for |t| ≥ 1/R 2 d , illustrating that diffraction cannot be described within the logic of the eigenstate scattering formalism [50,51] …”

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confidence: 99%

Generalized parton distributions and rapidity gap survival in exclusive diffractiveppscattering

et al. 2007

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We propose a new approach to the problem of rapidity gap survival (RGS) in the production of high-mass systems (H = dijet, heavy quarkonium, Higgs boson) in double-gap exclusive diffractive pp scattering, pp → p + (gap) + H + (gap) + p. It is based on the idea that hard and soft interactions proceed over widely different time-and distance scales and are thus approximately independent. The high-mass system is produced in a hard scattering process with exchange of two gluons between the protons. Its amplitude is calculable in terms of the gluon generalized parton distributions (GPDs) in the protons, which can be measured in J/ψ production in exclusive ep scattering. The hard scattering process is modified by soft spectator interactions, which we calculate in a model-independent way in terms of the pp elastic scattering amplitude. Contributions from inelastic intermediate states are suppressed. A simple geometric picture of the interplay of hard and soft interactions in diffraction is obtained. The onset of the black-disk limit in pp scattering at TeV energies strongly suppresses diffraction at small impact parameters and is the main factor in determining the RGS probability. Correlations between hard and soft interactions (e.g. due to scattering from the long-range pion field of the proton, or due to possible short-range transverse correlations between partons) further decrease the RGS probability. We also investigate the dependence of the diffractive cross section on the transverse momenta of the final-state protons ("diffraction pattern"). By measuring this dependence one can perform detailed tests of the interplay of hard and soft interactions, and even extract information about the gluon GPD in the proton. Such studies appear to be feasible with the planned forward detectors at the LHC.

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“…In the standard version of the Good-Walker description (with g i ≡ 1) the coherent contribution to inelastic diffraction does not appear at all. Thus in [7] the forward…”

Section: Diffractive Limit Versus "Diffractive" Eigenstatesmentioning

confidence: 99%

The Structure of Forward Peak in Elastic and Inclusive Inelastic Diffraction

Małecki¹

2007

Proceedings of Diffraction 06, International Workshop on Diffraction in High-Energy Physics — PoS(DIFF2006)

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Elastic scattering and inclusive inelastic diffraction of high energy hadrons at small momentum transfers are considered. A general expression for the elastic scattering amplitude in terms of even moments of the probability distribution is presented. We also show that the shape of the forward inclusive inelastic diffraction is determined by elastic scattering in the transition region between the forward peak and diffraction minimum.

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Diffraction scattering and the parton structure of hadrons

Cited by 194 publications

References 24 publications

Diffraction in QCD

Diffraction in QCD

Generalized parton distributions and rapidity gap survival in exclusive diffractiveppscattering

The Structure of Forward Peak in Elastic and Inclusive Inelastic Diffraction

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