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First Measurement of the Transverse Spin Asymmetries of the Deuteron in Semi-Inclusive Deep Inelastic Scattering

The COMPASS Collaboration

Abstract

First measurements of the Collins and Sivers asymmetries of charged hadrons produced in deep-inelastic scattering of muons on a transversely polarized 6-LiD target are presented. The data were taken in 2002 with the COMPASS spectrometer using the muon beam of the CERN SPS at 160 GeV/c. The Collins asymmetry turns out to be compatible with zero, as does the measured Sivers asymmetry within the present statistical errors.

First Measurement of the Transverse Spin Asymmetries of the Deuteron in Semi-Inclusive Deep Inelastic Scattering

Abstract

First measurements of the Collins and Sivers asymmetries of charged hadrons produced in deep-inelastic scattering of muons on a transversely polarized 6-LiD target are presented. The data were taken in 2002 with the COMPASS spectrometer using the muon beam of the CERN SPS at 160 GeV/c. The Collins asymmetry turns out to be compatible with zero, as does the measured Sivers asymmetry within the present statistical errors.

Paper Structure

This paper contains 1 section, 8 equations, 2 figures.

Table of Contents

  1. Acknowledgements

Figures (2)

  • Figure 1: Definition of the Collins and Sivers angles.
  • Figure 2: Collins asymmetry (top) and Sivers asymmetry (bottom) against $x$, $z$ and $p_T^h$ for positive (full points) and negative hadrons (open points). Error bars are statistical only. The first column gives the asymmetries for all hadrons, the other three columns for the leading hadrons. In all the plots the points are slightly shifted horizontally with respect to the measured value.