Elsevier

Physics Letters B

Volume 185, Issues 1–2, 12 February 1987, Pages 209-212
Physics Letters B

Λ0 polarization in proton-proton interactions from √s = 31 to 62 GeV

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Abstract

We report Λ0-hyperon polarization measurements at the CERN intersecting storage rings from √s of 31 to 62 GeV. PΛ0 changes insignificantly, +(0.8±1.7)%, over this range of √s. However, PΛ0 is observed to grow with Feynman-xF and with transverse momentum. At an average pt of 1.1 GeV/c, PΛ0 depends linearly on xF and approaches −40% at xF=0.8.

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We remain grateful to the ISR Operations and Experimental Support Groups for their invaluable efforts, and to the CERN administration for their support. We thank L. Pondrom for providing us with the FNAL hydrogen-target results [12] used in fig. 3.

3

Supported in part by US National Science Foundation grants PHY79-24766 and PHY85-09175.

1

Present address: University of Birmingham, Birmingham B15 2TT, UK.

2

Present address: Istituto di Cosmogeofisica del CNR, Turin, Italy.

4

Present address: Weizmann Institute, 76 100 Rehovot, Israel.

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