Measurement of the polarization of Lambda0 AntiLambda0, Sigma+ and Xi- produced in a Sigma- beam of 330 GeV/c

TL;DR

This paper reports the first measurement of polarization of various baryons produced by a hyperon beam at 330 GeV/c, revealing different polarization behaviors and providing new insights into hyperon production mechanisms.

Contribution

It presents the first measurement of baryon polarization produced by a hyperon beam at high energy, expanding understanding of hyperon production and polarization phenomena.

Findings

No polarization observed for AntiLambda0.

Lambda0 and Sigma+ show low polarization at 1 GeV/c transverse momentum.

Xi- polarization similar to Lambda0 in proton beam experiments.

Abstract

The polarization of Lambda0, AntiLambda0, Sigma+ and Xi- inclusively produced in Sigma- induced interactions at 330 GeV has been measured in the experiment WA89 at CERN. This is the first measurement of polarization of baryons produced by a hyperon beam. No polarization of AntiLambda is observed, as was also the case in proton beam data. At transverse momenta of about 1 GeV/c Lambda0 and Sigma+ show little polarization, significantly lower than in the proton beam data, while Xi- have a polarization comparable to the polarization of Lambda0 produced in proton beams.