Measurement of the Spin Structure of the Deuteron in the DIS Region

TL;DR

This paper reports a new measurement of the deuteron's spin structure functions in deep inelastic scattering, providing more precise data over a broad kinematic range to enhance understanding of nucleon spin dynamics.

Contribution

It presents the first high-precision measurement of the deuteron spin asymmetry and structure function in a wide Q^2 and x range, improving statistical accuracy over previous experiments.

Findings

Results agree with previous data

Enhanced statistical precision in low-x region

Extended kinematic coverage for spin structure functions

Abstract

We present a new measurement of the longitudinal spin asymmetry A_1^d and the spin-dependent structure function g_1^d of the deuteron in the range 1 GeV^2 < Q^2 < 100 GeV^2 and 0.004< x <0.7. The data were obtained by the COMPASS experiment at CERN using a 160 GeV polarised muon beam and a large polarised 6-LiD target. The results are in agreement with those from previous experiments and improve considerably the statistical accuracy in the region 0.004 < x < 0.03.