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Total π + p cross section extracted from the leading neutron spectra at the LHC.

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


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.

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Publisher statement:Reprinted with permission from the American Physical Society: 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 © 2017 by the American Physical Society. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modified, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society.
Date accepted:17 May 2017
Date deposited:10 October 2017
Date of first online publication:22 August 2017
Date first made open access:10 October 2017

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