Photon-proton and photon-photon scattering from nucleon-nucleon forward amplitudes

Block, M. M.; Gregores, E. M.; Halzen, F.; Pancheri, G.

doi:10.1103/physrevd.60.054024

Cited by 114 publications

(213 citation statements)

References 28 publications

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“…(A7) gives an excellent fit to the more complicated and restricted form for σ gg derived in [10] at higher energies where this term is important, and contributes less than 1% of the total eikonal function at b = 0 at the low-energy matching point W = W 0 = 4 GeV in agreement with the results there. Our fit to the pp andpp scattering cross sections, the ratios ρ of the real to the imaginary part of the forward elastic scattering amplitudes, and the logarithmic derivatives B of the forward differential cross sections dσ/dt used the six coefficients C 0 , C 1 , C 2 , C 3 , C 4 , C 5 and the parameters α 1 , α 2 , and β.…”

Section: Discussionsupporting

confidence: 79%

“…We simply follow the parametrizations used in [10] allowing, however, the powers in the Regge-like low-energy terms to vary from the 1/ √ s = 1/W behavior assumed there. …”

Section: Discussionmentioning

confidence: 99%

“…The model used here in fitting the pp and pp cross sections is a modification of the "Aspen model" of Block et al [9,10]. That model was based the structure of the eikonal function found in QCD minijet models for the scattering in which the interactions between hadrons are described in terms of the interactions of their constituent quarks and gluons with allowance for "soft" interactions at low momentum transfers.…”

Section: Appendix A: the Modified Aspen Modelmentioning

confidence: 99%

“…That model was based the structure of the eikonal function found in QCD minijet models for the scattering in which the interactions between hadrons are described in terms of the interactions of their constituent quarks and gluons with allowance for "soft" interactions at low momentum transfers. While we will follow the notation used in [10], the identification of the terms made there as describing quark-quark (qq), quark-gluon (qg), or gluon-gluon (gg) interactions becomes blurred in the general setting, especially for the qq and qg terms.…”

Section: Appendix A: the Modified Aspen Modelmentioning

confidence: 99%

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Eikonal fit toppandp¯pscattering and the edge in the scattering amplitude

Block

Durand

et al. 2015

Phys. Rev. D

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We make a detailed eikonal fit to current data on the total and elastic scattering cross sections, the ratios ρ of the real to the imaginary parts of the forward elastic scattering amplitudes, and the logarithmic slopes B of the differential cross sections dσ/dt at t = 0, for proton-proton and antiproton-proton scattering at center-of-mass energies W from 5 GeV to 57 TeV. The fit allows us to investigate the structure of the eikonal amplitudes in detail, including the impact-parameter structure of the energy-independent edge in the scattering amplitude shown to exist by Block et al.[1]. We show that the edge region has an essentially fixed shape with a peak at approximately the "black disk" radius Rtot = σtot/2π of the scattering amplitude, a constant width t edge ≈ 1 fm, and migrates to larger impact parameters with increasing energy proportionally to Rtot. We comment on possible physical mechanisms which could lead to the edge. We show that the eikonal results for the cross sections and ρ values are described to high accuracy by analytic expressions of the forms used in earlier analyses by Block and Halzen, and extend the result to the elastic-scattering slope parameter B. These expressions provide simple extrapolations of the results to much higher energies where the cross sections approach the black disk limit with σ elas , σ inel → σtot/2 and B → σtot/8π. Finally, we calculate the survival probabilities for large rapidity gaps in the scattering.

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Section: Discussionsupporting

confidence: 79%

“…We simply follow the parametrizations used in [10] allowing, however, the powers in the Regge-like low-energy terms to vary from the 1/ √ s = 1/W behavior assumed there. …”

Section: Discussionmentioning

confidence: 99%

Section: Appendix A: the Modified Aspen Modelmentioning

confidence: 99%

Section: Appendix A: the Modified Aspen Modelmentioning

confidence: 99%

See 2 more Smart Citations

Eikonal fit toppandp¯pscattering and the edge in the scattering amplitude

Block

Durand

et al. 2015

Phys. Rev. D

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show abstract

“…That is the case in the formalisms by Margolis et al [25,26,27] and the more recent version sometimes referred to as Aspen model, by Block et al [28,29]. However, despite its efficiency in the description of the forward quantities in the elastic channel, as well as differential cross sections at small values of the momentum transfer a serious drawback with the Aspen model concerns the absence of the expected connections with nonperturbative QCD.…”

Section: Eikonalized Approachmentioning

confidence: 91%

Aspects of a dynamical gluon mass approach to elastic hadron scattering at LHC

Fagundes¹,

Luna²,

Menon³

et al. 2012

Nuclear Physics A

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We discuss how the main features of the recent LHC data on elastic scattering can be described by a QCD-inspired formalism with a dynamical infrared mass scale. For this purpose new developments on a dynamical gluon mass approach are reported, with emphasis on a method to estimate uncertainty bounds in the predictions for the high-energy scattering observables. We investigate the effects due to the correlations among the fixed and free parameters involved and show that the band of predictions are consistent with the recent data from the TOTEM experiment, including the forward quantities and the differential cross section up to the dip position.

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Heavy Majorana neutrinos from Wγ fusion at hadron colliders

Alva

Han

Ruiz

2015

J. High Energ. Phys.

149

202

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Vector boson fusion processes become increasingly more important at higher collider energies and for probing larger mass scales due to collinear logarithmic enhancements of the cross section. In this context, we revisit the production of a hypothetic heavy Majorana neutrino (N ) at hadron colliders. Particular attention is paid to the fusion process W γ → N ℓ ± . We systematically categorize the contributions from a photon initial state in the elastic, inelastic, and deeply inelastic channels. Comparing with the leading channel via the Drell-Yan production qq ′ → W * → N ℓ ± at NNLO in QCD, we find that the W γ fusion process becomes relatively more important at higher scales, surpassing the DY mechanism at m N ∼ 1 TeV (770 GeV), at the 14 TeV LHC (100 TeV VLHC). We investigate the inclusive heavy Majorana neutrino signal, including QCD corrections, and quantify the Standard Model backgrounds at future hadron colliders. We conclude that, with the currently allowed mixing |V µN | 2 < 6 × 10 −3 , a 5σ discovery can be made via the same-sign dimuon channel for m N = 530 (1070) GeV at the 14 TeV LHC (100 TeV VLHC) after 1 ab −1 . Reversely, for m N = 500 GeV and the same integrated luminosity, a mixing |V µN | 2 of the order 1.1 × 10 −3 (2.5 × 10 −4 ) may be probed.

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Photon-proton and photon-photon scattering from nucleon-nucleon forward amplitudes

Cited by 114 publications

References 28 publications

Eikonal fit toppandp¯pscattering and the edge in the scattering amplitude

Eikonal fit toppandp¯pscattering and the edge in the scattering amplitude

Aspects of a dynamical gluon mass approach to elastic hadron scattering at LHC

Heavy Majorana neutrinos from Wγ fusion at hadron colliders

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