Accurate Measurement of F2d/F2p and Rd-Rp

TL;DR

This paper reports precise measurements of the structure function ratios F2d/F2p and the difference Rd-Rp from deep inelastic muon scattering, revealing their dependence on x and Q^2 with implications for nucleon structure.

Contribution

It provides new, accurate measurements of F2d/F2p and Rd-Rp over a broad kinematic range, with small errors, enhancing understanding of nucleon structure functions.

Findings

Rd-Rp is compatible with zero in the measured range.

F2d/F2p decreases with Q^2 for x > 0.1.

Measurements cover 0.001<x<0.8 and 0.1<Q^2<145 GeV^2.

Abstract

Results are presented for F2d/F2p and Rd-Rp from simultaneous measurements of deep inelastic muon scattering on hydrogen and deuterium targets, at 90, 120, 200 and 280 GeV. The difference Rd-Rp, determined in the range 0.002<x<0.4 at an average Q^2 of 5 GeV^2, is compatible with zero. The x and Q^2 dependence of F2d/F2p was measured in the kinematic range 0.001<x<0.8 and 0.1<Q^2<145 GeV^2 with small statistical and systematic errors. For x>0.1 the ratio decreases with Q^2.