SINGLE SPIN ASYMMETRY MEASUREMENTS FOR π0 INCLUSIVE PRODUCTIONS IN p + p↑ → π0 + X AND π− + p↑ → π0 + X REACTIONS AT 70 AND 40 GeV RESPECTIVELY
/ Authors
A. Davidenko, A. Derevschikov, V. Grishin, V. Khodyrev, Y. Matulenko, Y. Melnick, A. Meschanin, V. Mochalov, L. Nogach, S. Nurushev
and 14 more authors
P. Semenov, A. Prudkoglyad, K. Shestermanov, L. Soloviev, A. Vasiliev, A. Yakutin, N. Borisov, V. N. Matafonov, A. Neganov, Y. Plis, Y. Usov, A. Fedorov, A. Lukhanin, M. Ryskin
/ Abstract
The inclusive $\pi^0$ asymmetries were measured in reactions $p+p\uparrow \to \pi^0+X$ and $\pi^-+p\uparrow \to \pi^0+X$ at 70 and 40 GeV/c respectively. The measurements were made at the central region (for the first reaction) and asymmetry is compatible with zero in the entire measured $p_T$ region. For the second reaction the asymmetry is zero for small $x_F$ region ($-0.4<x_F<-0.1, 0.5<p_T(GeV/c) <1.5$) and increases with growth of $\mid x_F\mid$. Averaged over the interval $-0.8<x_F<-0.4, 1<p_T(GeV/c)<2$ the asymmetry was $-(13.8\pm 3.8)%$.