Observation of B* production in e + e - interactions above the b-flavor threshold
Abstract
We have observed production of monochromatic low-energy photons in e+e- interactions between 10.6 and 11.2 GeV/c2. We show that this signal is associated with the production of b-flavored meson pairs, and interpret it as due to the decay B*-->B+γ. This is the first experimental evidence for the existence of vector bū or bd¯ bound states. We determine the mass difference of the vector and pseudo- scalar states, M(B*)-M(B), to be 52+/-2+/-4 MeV.
- Publication:
-
Physical Review Letters
- Pub Date:
- July 1985
- DOI:
- 10.1103/PhysRevLett.55.36
- Bibcode:
- 1985PhRvL..55...36H
- Keywords:
-
- 13.65.+i;
- 13.40.Hq;
- 14.40.Gx;
- Electromagnetic decays;
- Mesons with S=C=B=0 mass>2.5 GeV