Search for Dimuon Decays of a Light Scalar Boson in Radiative Transitions Upsilon ---> gamma A0
Collaboration
11 pages
Published in:
- Phys.Rev.Lett. 103 (2009) 081803
e-Print:
- 0905.4539 [hep-ex]
Report number:
- BABAR-PUB-09-015,
- SLAC-PUB-13653
Experiments:
Citations per year
Abstract: (arXiv)
We search for evidence of a light scalar boson in the radiative decays of the Upsilon(2S) and Upsilon(3S) resonances: Upsilon(2S,3S)-> gamma A0, A0 -> mu^+ mu^-. 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<= m(A0)<= 9.3 GeV in the samples of 99*10^6 Upsilon(2S) and 122*10^6 Upsilon(3S) decays collected by the BABAR detector at the 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 eta_b meson: BR(eta_b->mu^+mu^-)<0.9% at 90% confidence level.Note:
- 10 pages, 11 postscript figures, submitted to Physical Review Letters
- 14.40.Gx
- 13.20.Gd
- 14.80.Cp
- 14.80.Mz
- electron positron: annihilation
- upsilon mesons: radiative decay
- boson: scalar: leptonic decay
- final state: dimuon
- scalar particle: mass
- Higgs particle
References(27)
Figures(4)