Comments concerning the paper "Measurement of negatively charged pion spectra in inelastic p+p interactions at 20, 31, 40, 80 and 158 GeV/c" by the NA61 collaboration

TL;DR

This paper critically compares new NA61 data on negative pion production in p+p interactions across various energies with previous results, highlighting discrepancies in yields and distributions.

Contribution

It provides a detailed comparison revealing inconsistencies between NA61 measurements and earlier data in pion production at multiple energies.

Findings

NA61 data show discrepancies with previous results

Differences observed in total yields and rapidity distributions

Inconsistencies in double differential cross sections

Abstract

New data from the NA61 collaboration on the production of negative pions in p+p interactions at beam momenta between 20 and 158 GeV/c are critically compared to available results in the same energy range. It is concluded that the NA61 data show some discrepancies with the previous results. This concerns in particular the total yields, the $p_T$ integrated rapidity distributions and the double differential cross sections.