Single-Spin Asymmetry in Inclusive $\ddot{I}{€}^0$ Production Measured at the Protvino 70 GeV Accelerator

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 $p+p(pol)->\ddot{I}{€}^0+X$ in the central region is close to zero within the error bars. SSA in the reaction $\ddot{I}{€}^{-}+p(pol)->\ddot{I}{€}^0+X$ 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.

5 pages, 6 figures; Presented on "Advanced Studies Institute" - Symmetries and SPIN, (SPIN-Praha-2003), Prague, July 12 - July 19, 2003