Charmed Hadron Production in Polarized pp Reactions as a Probe of   Polarized Gluons in the Proton
  To probe the behavior of polarized gluons in the proton, we propose the charmed hadron, such as Lambda_c and D^*, production in the forthcoming RHIC experiments. We found that the spin correlation between the target proton and the produced Lambda_c baryon might be a good signal for testing models of the polarized gluon distribution in the proton. 
Toshiyuki Morii (Kobe Univ.) and Kazumasa Ohkuma (Yokohama National   Univ.)