There have been great Jewish baseball players. Some wouldn’t play on Yom Kippur. None, however, wore a yarmulke under their baseball hats. Zev Roth’s new book “Short Stop : A Bar Mitzvah Boy in the Majors” is the ultimate Jewish baseball novel. It is a fascinating and funny account of a Bar Mitzvah boy named Shalom Greenberg who is called on to pitch in the majors. To make matters worse, Shalom doesn’t play baseball very well. The events in the book are carefully crafted to make something so implausible seem possible. “Short Stop : a Bar Mitzvah Boy in the Major” is the ideal book for anyone who ever harbored dreams of playing Major League Baseball.