Leading order analysis of neutrino induced dimuon events in the CHORUS experiment

TL;DR

This paper presents a leading order QCD analysis of neutrino-induced dimuon events in the CHORUS experiment, determining the charm quark mass and strange sea ratio with improved precision.

Contribution

It provides the first leading order QCD analysis of a large neutrino dimuon dataset from CHORUS, refining measurements of charm mass and strange sea content.

Findings

Charm quark mass $ ext{m}_c = 1.26 ext{ GeV}/c^2$ with uncertainties

Strange to non-strange sea ratio $ ext{kappa} = 0.33$ with uncertainties

Improved precision over previous experiments

Abstract

We present a leading order QCD analysis of a sample of neutrino induced charged-current events with two muons in the final state originating in the lead-scintillating fibre calorimeter of the CHORUS detector. The results are based on a sample of 8910 neutrino and 430 antineutrino induced opposite-sign dimuon events collected during the exposure of the detector to the CERN Wide Band Neutrino Beam between 1995 and 1998. % with $E_{\mu 1},E_{\mu 2} > 5$ GeV and $Q^2 > 3$ GeV$^2$ collected %between 1995 and 1998. The analysis yields a value of the charm quark mass of $\mc = (1.26\pm 0.16 \pm 0.09) \GeVcc $ and a value of the ratio of the strange to non-strange sea in the nucleon of $\kappa = 0.33 \pm 0.05 \pm 0.05$, improving the results obtained in similar analyses by previous experiments.