A measurement of the transverse polarization of $\Lambda$-hyperons produced in inelastic p$N$-reactions at 450 GeV proton energy

V. Fanti - et al.

doi:doi:10.1007/s100529801045

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Particles and Fields

Eur. Phys. J. C 6, 265-269
DOI 10.1007/s100529801045

A measurement of the transverse polarization of $\Lambda$ -hyperons produced in inelastic pN-reactions at 450 GeV proton energy

V. Fanti - et al.

Dipartimento di Fisica dell'Università e Sezione dell'INFN di Cagliari, I-09100 Cagliari, Italy

Received: 21 September 1998 / Published online: 19 November 1998

Abstract
A study of the polarization of $\Lambda$ hyperons produced in inelastic pN reactions induced by the 450 GeV proton beam from the CERN SPS has been performed with the NA48 detector. The $\Lambda$ hyperons were detected at a fixed angle of 4.2 mrad in the momentum range from 50 GeV/c to 200 GeV/c. The polarization changes from $-0.053 \pm 0.034$ to $-0.298 \pm 0.074$ for a transverse momentum range of the $\Lambda$ between 0.28 GeV/c and 0.86 GeV/c. The $\overline{\Lambda}$ polarization is consistent with zero.