<span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow><mi mathvariant="italic">Λ</mi></mrow><mrow><mn>0</mn></mrow></msup></mrow></math></span> Polarization in <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mn>800</mn><mi>−</mi><mi>GeV</mi><mi>/</mi><mi mathvariant="italic">cpp</mi><mi></mi><mo>→</mo><mi></mi><mrow><msub><mrow><mi>p</mi></mrow><mrow><mi>f</mi></mrow></msub></mrow><mo>(</mo><mrow><msup><mrow><mi mathvariant="italic">Λ</mi></mrow><mrow><mn>0</mn></mrow></msup></mrow><mrow><msup><mrow><mi mathvariant="italic">K</mi></mrow><mrow><mo>+</mo></mrow></msup></mrow><mo>)</mo></math></span>

J. Félix; M. C. Berisso; D. C. Christian; A. Gara; E. E. Gottschalk; G. Gutiérrez; E. P. Hartouni; B. C. Knapp; M. N. Kreisler; S. Lee; K. Markianos; G. Moreno; M. A. Reyes; M. Sosa; M. H. L. S. Wang; A. Wehmann; D. Wesson

doi:10.1103/PhysRevLett.88.061801

$Λ^{0}$ Polarization in $800 - GeV / cpp \to p_{f} (Λ^{0} K^{+})$

J. Félix, M. C. Berisso, D. C. Christian, A. Gara, E. E. Gottschalk, G. Gutiérrez, E. P. Hartouni, B. C. Knapp, M. N. Kreisler, S. Lee, K. Markianos, G. Moreno, M. A. Reyes, M. Sosa, M. H. L. S. Wang, A. Wehmann, and D. Wesson

Phys. Rev. Lett. 88, 061801 – Published 24 January 2002

Abstract

We report results from a study of $Λ^{0}$ polarization in the exclusive reaction $pp \to p_{f} (Λ^{0} K^{+})$ at $800 - GeV / c$ . We observe a dependence of the polarization on the $Λ^{0} K^{+}$ invariant mass with large $(+ 71 %)$ positive polarization at small mass $(1.63 - GeV {/ c}^{2})$ and large $(- 43 %)$ negative polarization at large mass $(2.75 - GeV {/ c}^{2})$ . This observation confirms the result of the CERN ISR R608 experiment and extends the range over which the effect is observed. The strong dependence of the polarization on the $Λ^{0} K^{+}$ invariant mass suggests that the origin of the polarization is closely related to the production dynamics of the diffractively produced $Λ^{0} K^{+}$ system.