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Single-Spin Asymmetry in Inclusive $\pi^0$ Production Measured at the Protvino 70 GeV Accelerator

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arxiv hep-ex/0312014 v1 pith:RFQFFFQX submitted 2003-12-03 hep-ex

classification hep-ex
keywords acceleratorasymmetrymeasuredprotvinoreactionregionarisesasymmetries
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

Single Spin Asymmetries (SSA) $A_N$ measured in the two reactions at the Protvino 70 GeV accelerator are presented. $A_N$ in the reaction $p+p(pol)->\pi^0+X$ in the central region is close to zero within the error bars. SSA in the reaction $\pi^- +p(pol)->\pi^0+X$ in the polarized target fragmentation region is equal to $(-15 \pm 4)%$ at $|x_F|>0.4$. There is an indication that the asymmetry arises at the same pion energy in the center of mass system.

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