[1] Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA
[2] Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA
[3] Univ Warsaw, Fac Phys, PL-00681 Warsaw, Poland
[4] CERN, Dept Phys, CH-1211 Geneva 23, Switzerland
[5] Berea Coll, Dept Phys, Berea, KY 40404 USA