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Durham University

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Publication details for Alan Martin

Khoze, V. A., Martin, A. D. & Ryskin, M. G. (2017). Total π + p cross section extracted from the leading neutron spectra at the LHC. Physical Review D 96(3): 034018.

Author(s) from Durham


We use the very forward neutron energy spectra measured by the LHC forward experiment at 7 TeV
to extract the πþp total cross section at center-of-mass energies in the range 2.3–3.5 TeV. To do this, we
have to first isolate the π-exchange pole in forward neutron production in pp collisions, by evaluating other
possible contributions, namely, those from ρ and a2 exchange, from both eikonal and enhanced screening
effects, from migration, from neutron production by Δ-isobar decay and from diffractive nucleon
excitations. We discuss the possible theoretical uncertainties due to the fact that the data do not exactly
reach the π pole. We choose the kinematical domain where the pion contribution dominates and
demonstrate the role of the different corrections which could affect the final result.