Spin Transfer in Inclusive<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>Λ</mml:mi></mml:mrow><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>Production by Transversely Polarized Protons at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mn>2</mml:mn><mml:mn>0</mml:mn><mml:mn>0</mml:mn><mml:mspace/><mml:mi>G</mml:mi><mml:mi>e</mml:mi><mml:mi>V</mml:mi></mml:math>/<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="italic">c</mml:mi></mml:math>

Surprisingly large polarizations in hyperon production by unpolarized protons have been known for a long time. The spin dynamics of the production process can be further investigated with polarized beams. Recently, a negative asymmetry ${A}_{N}$ was found in inclusive ${\ensuremath{\Lambda}}^{0}$ production with a $200\mathrm{GeV}/c$ transversely polarized proton beam. The depolarization ${D}_{\mathrm{NN}}$ in $p\ensuremath{\uparrow}+p\ensuremath{\rightarrow}{\ensuremath{\Lambda}}^{0}+X$ has been measured with the same beam over a wide ${x}_{F}$ range and at moderate ${p}_{T}$. ${D}_{\mathrm{NN}}$ reaches positive values of about 30% at high ${x}_{F}$ and ${p}_{T}\ensuremath{\sim}1.0\mathrm{GeV}/c$. This result shows a sizable spin transfer from the incident polarized proton to the outgoing ${\ensuremath{\Lambda}}^{0}$.