Institute of Particle and Nuclear Studies
High Energy Accelerator Research Organization(KEK)
Tsukuba, Ibaraki 305, Japan
Faculty of Engineering, Seikei University
Musashino, Tokyo 180, Japan
We calculated cross sections of a scalar charm production in the framework of an R-parity breaking SUSY model at HERA experiments. A scalar charm is produced by collision and decays into , which followed by , , and . Cross sections of an exact calculation using the GRACE system are compared with those from approximation methods with and without spin correlation.