The spin-symmetry of the quark model
P.J. O'Donnell1 - Q.P. Xu2 - H.K.K. Tung3
1 Physics Department, University of Toronto, Toronto, Ontario M5S 1A7, Canada
2 Platform Computing Corp., 3760 14th Avenue, Markham, Ontario L3R 3T7, Canada
3 Department of Applied Physics, Hong Kong Polytechnic University, Hung Hom, Hong Kong
Received: 21 January 1999 / Published online: 20 May 1999
Corrections to the exact heavy-quark symmetry results are expected to come from the inverse powers of the heavy-quark mass. We show, by an explicit calculation using the quark model, that the breaking of the spin symmetry is suppressed by other kinematic effects even when the quark masses are not heavy.