Addendum to multiplicities of charged pions, kaons and unidentified charged hadrons on an isoscalar target measured by COMPASS Collaboration

TL;DR

This paper updates previous COMPASS measurements of charged hadron multiplicities by applying improved QED radiative corrections using DJANGOH, resulting in more accurate isoscalar multiplicity data.

Contribution

It provides an updated set of isoscalar multiplicities with enhanced radiative correction treatment, superseding earlier results.

Findings

Radiative corrections increased by up to 12% in certain kinematic regions.

Updated multiplicities ensure consistent treatment of different target data.

Results improve the precision of hadron multiplicity measurements.

Abstract

The COMPASS Collaboration has recently published an article "Multiplicities of positive and negative pions, kaons, and unidentified hadrons from deep-inelastic scattering of muons off a liquid hydrogen target", Phys. Rev. D 112 (2025) 012002. In contrast to earlier COMPASS publications on similar topics, the aforementioned article features an enhanced treatment of QED radiative corrections, employing the DJANGOH Monte Carlo generator. This methodological improvement led to corrections that are up to 12% larger in the low-x, high-z region compared to the previously applied ones. To ensure consistent treatment of COMPASS data sets obtained using both isoscalar and proton targets, this paper presents an updated set of isoscalar multiplicities based on DJANGOH-derived radiative corrections. The present results supersede those published in Phys. Lett. B 764 (2017) 1 and Phys. Lett. B 767 (2017) 133.