Search for Dimuon Decays of a Light Scalar Boson in Radiative Transitions Upsilon ---> gamma A0

Collaboration
May, 2009

Citations per year

20092013201720212024051015202530
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