Polarization of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Λ</mml:mi><mml:mo>'</mml:mo><mml:mi>s</mml:mi></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mrow><mml:mover><mml:mrow><mml:mi>Λ</mml:mi></mml:mrow><mml:mrow><mml:mi>¯</mml:mi></mml:mrow></mml:mover></mml:mrow></mml:mrow><mml:mo>'</mml:mo><mml:mi>s</mml:mi></mml:math>in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>pp</mml:mi></mml:math>,<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mrow><mml:mover><mml:mrow><mml:mi>p</mml:mi></mml:mrow><mml:mrow><mml:mi>¯</mml:mi></mml:mrow></mml:mover></mml:mrow></mml:mrow><mml:mi>p</mml:mi></mml:math>, and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>K</mml:mi></mml:mrow><mml:mrow><mml:mo>−</mml:mo></mml:mrow></mml:msup></mml:mrow><mml:mi>p</mml:mi></mml:math>Interactions at 176 GeV/<i>c</i>

198649 citationsJournal Article

Authors

S.A. Gourlay · University of California, Davis

H. L. Melanson · Michigan State University

M. Abolins · Michigan State University

K. W. Edwards · Carleton University

W. R. Francis · Michigan State University

H. G. E. Kobrak · University of California, San Diego

D. Owen ·

Abstract

We have measured the polarization of $\ensuremath{\Lambda}'s$ in inclusive $\mathrm{pp}$ and ${K}^{\ensuremath{-}}p$ reactions and of $\overline{\ensuremath{\Lambda}}'s$ in $\overline{p}p$ interactions at a beam momentum of 176 GeV/c. Data were taken in the beam-fragmentation region with hyperon transverse momenta from 0.2 to 1.5 GeV/c. The $\overline{P}$ produced $\overline{\ensuremath{\Lambda}}'s$ have the same magnitude and sign of polarization as the $p$-produced $\ensuremath{\Lambda}'s$, whereas the $\ensuremath{\Lambda}'s$ from ${K}^{\ensuremath{-}}p$ interactions are more highly polarized and in the opposite direction.

Topics & Keywords

Particle physics theoretical and experimental studies Quantum Chromodynamics and Particle Interactions High-Energy Particle Collisions Research

Publication Details

Published in: Physical Review Letters

Volume 56, Issue 21, pp. 2244-2247

DOI: 10.1103/physrevlett.56.2244

Field-Weighted Citation Impact: 5.37

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Publication Details