Target Fragmentation in $pp$, $ep$ and $γp$ Collisions at High Energies

Details Target Fragmentation in $pp$, $ep$ and $γp$ Collisions at High Energies Target Fragmentation in $pp$, $ep$ and $γp$ Collisions at High Energies

1998-06-09

arxiv.org/abs/hep-ph/9806321v3

Eur.Phys.J. A7 (2000) 109-119

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages, 11 figures (one added), references added. Absorption effects in DIS revised

Scientific paper

We calculate target fragmentation in $p p \to n X$ and $\gamma p \to n X $ reactions in the meson cloud picture of the nucleon. The $p p \to n X$ reaction is used to fix the $pn\pi^+$ form factor for three different models. We take into account the possible destruction of the residual neutron by the projectile. Using the form factor from the hadronic reaction we calculate photoproduction and small $x_{Bj}$ electroproduction of forward neutrons at HERA. Here the $q \bar q$ dipoles in the photon can rescatter on the residual neutron. In photoproduction we observe slightly less absorption than in the hadronic reaction. For deep inelastic events ($Q^2>10$ GeV$^2$) screening is weaker but still present at large $Q^2$. The signature for this absorptive rescattering is a shift of the $d\sigma/dE_n$ distribution to higher neutron energies for photofragmentation.

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