The influence of direct $D$-meson production to the determination on the nucleon strangeness asymmetry via dimuon events in neutrino experiments

TL;DR

This paper investigates how direct $D$-meson production mechanisms, specifically heavy quark recombination and light quark fragmentation, significantly affect the measurement of nucleon strangeness asymmetry in neutrino deep inelastic scattering experiments.

Contribution

It quantitatively analyzes the impact of direct $D$-meson production on the determination of nucleon strangeness asymmetry, highlighting the importance of including these effects for accurate measurements.

Findings

HQR has a stronger influence than LQF-P on strangeness asymmetry measurement.

Direct $D$-meson production can substantially alter the extracted strangeness asymmetry.

The study provides quantitative estimates of these effects in neutrino DIS experiments.

Abstract

Experimentally, the production of oppositely charged dimuon events by neutrino and anti-neutrino deep inelastic scattering (DIS) is used to determine the strangeness asymmetry inside a nucleon. Here we point out that the direct production of $D$-meson in DIS may make substantial influence to the measurement of nucleon strange distributions. The direct $D$-meson production is via the heavy quark recombination (HQR) and via the light quark fragmentation from perturbative QCD (LQF-P). To see the influence precisely, we compute the direct $D$-meson productions via HQR and LQF-P quantitatively and estimate their corrections to the analysis of the strangeness asymmetry. The results show that HQR has stronger effect than LQF-P does, and the former may influence the experimental determination of the nucleon strangeness asymmetry.