Damping of forward neutrons in pp collisions

Abstract

We calculate absorptive corrections to single pion exchange in the production of leading neutrons in pp collisions. Contrary to the usual procedure of convolving the survival probability with the cross section, we apply corrections to the spin amplitudes. The non-flip amplitude turns out to be much more suppressed by absorption than the spin-flip one. We identify the projectile proton Fock state responsible for the absorptive corrections as a color octet-octet 5-quarks configuration. Calculations within two very different models, color-dipole light-cone description, and in hadronic representation, lead to rather similar absorptive corrections. We found a much stronger damping of leading neutrons than in some of previous estimates. Correspondingly, the cross section is considerably smaller than was measured at ISR. However, comparison with recent measurements by the ZEUS collaboration of neutron production in deep-inelastic scattering provides a strong motivation for challenging the normalization of the ISR data. This conjecture is also supported by preliminary data from the NA49 experiment for neutron production in pp collisions at SPS.

14 pages, 15 figures. Data from the NA49 experiment and comments are added. Fig. 15 is modified

References in corpus (17)

• The Cosmological Parameters 2006
• Big-Bang nucleosynthesis (Particle Data Group mini-review)
• Saturation Effects in Deep Inelastic Scattering at low $Q^2$ and its Implications on Diffraction
• Soft diffraction and the elastic slope at Tevatron and LHC energies: a multi-Pomeron approach
• Nonperturbative Effects in Gluon Radiation and Photoproduction of Quark Pairs
• Coulomb Corrections to Elastic Electron-Proton Scattering and the Proton Charge Radius
• Nuclear Antishadowing in Neutrino Deep Inelastic Scattering
• Do the E866 Drell Yan data change our picture of the chiral structure of the nucleon ?
• Transparent Nuclei and Deuteron-Gold Collisions at RHIC
• Nonperturbative Gluon Radiation and Energy Dependence of Elastic Scattering
• Azimuthal anisotropy of direct photons
• Soft QCD Dynamics of Elastic Scattering in Impact Parameter Representation
• Leading neutron spectra
• Evidences for two scales in hadrons
• Large Rapidity Gap Processes in Proton-Nucleus Collisions
• Inelastic $J/\Psi$ Photoproduction off Nuclei: Gluon Enhancement or Double Color Exchange?
• The soft and the hard pomerons in hadron elastic scattering at small t

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