A Direct measurement of the J / Psi leptonic branching fraction

Coffman, D.D.CoffmanMIN-ZU WANG et al.2018-09-102018-09-101991-07http://inspirehep.net/record/317838http://scholars.lib.ntu.edu.tw/handle/123456789/292953A Direct measurement of the J / Psi leptonic branching fractionjournal article10.1103/PhysRevLett.68.282