Lambda and Antilambda polarization from deep inelastic muon scattering

TL;DR

This paper presents the first measurements of Lambda and Antilambda polarization in deep inelastic polarized muon scattering, revealing opposite signs and unexpected large negative Lambda polarization at low x_F, challenging existing models.

Contribution

It provides novel experimental data on Lambda and Antilambda polarization in deep inelastic muon scattering, with interpretations of unexpected polarization patterns.

Findings

Lambda and Antilambda polarizations have opposite signs.

Large negative Lambda polarization observed at low positive x_F.

Results challenge existing theoretical models.

Abstract

We report results of the first measurements of Lambda and Antilambda polarization produced in deep inelastic polarized muon scattering on the nucleon. The results are consistent with an expected trend towards positive polarization with increasing x_F. The polarizations of Lambda and Antilambda appear to have opposite signs. A large negative polarization for Lambda at low positive x_F is observed and is not explained by existing models.A possible interpretation is presented.