Search for Dimuon Decays of a Light Scalar Boson in Radiative Transitions Υ→γA0
Abstract
We search for evidence of a light scalar boson in the radiative decays of the Υ(2S) and Υ(3S) resonances: Υ(2S,3S)→γA0, A0→μ+μ-. Such a particle appears in extensions of the standard model, where a light CP-odd Higgs boson naturally couples strongly to b quarks. We find no evidence for such processes in the mass range 0.212≤mA0≤9.3GeV in the samples of 99×106 Υ(2S) and 122×106 Υ(3S) decays collected by the BABAR detector at the SLAC PEP-II B factory and set stringent upper limits on the effective coupling of the b quark to the A0. We also limit the dimuon branching fraction of the ηb meson: B(ηb→μ+μ-)<0.9% at 90% confidence level.
- Publication:
-
Physical Review Letters
- Pub Date:
- August 2009
- DOI:
- 10.1103/PhysRevLett.103.081803
- arXiv:
- arXiv:0905.4539
- Bibcode:
- 2009PhRvL.103h1803A
- Keywords:
-
- 14.80.Cp;
- 13.20.Gd;
- 14.40.Gx;
- 14.80.Mz;
- Non-standard-model Higgs bosons;
- Decays of J/psi Upsilon and other quarkonia;
- Mesons with S=C=B=0 mass>2.5 GeV;
- Axions and other Nambu-Goldstone bosons;
- High Energy Physics - Experiment
- E-Print:
- 10 pages, 11 postscript figures, submitted to Physical Review Letters