Measurement of the branching ratio for Υ''-->μμ
Abstract
Using the CUSB-II detector at the Cornell Electron Storage Ring, we have measured Bμμ, the branching fraction into muons, of the Υ'' meson. We find Bμμ(Υ'')=(1.53+/-0.33+/-0.21)%, from which the Υ'' total decay width is 25.5+/-5.0 keV. From this result we obtain αs=0.170+0.015-0.012, ΛMS¯=148+56-39 MeV. (MS¯ denotes the modified minimal-subtraction scheme).
- Publication:
-
Physical Review D
- Pub Date:
- April 1987
- DOI:
- 10.1103/PhysRevD.35.2265
- Bibcode:
- 1987PhRvD..35.2265K
- Keywords:
-
- 13.20.Gd;
- 14.40.Gx;
- Decays of J/psi Upsilon and other quarkonia;
- Mesons with S=C=B=0 mass>2.5 GeV