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Search for Dimuon Decays of a Light Scalar Boson in Radiative Transitions Y → yA^0 (2009)

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) → γA^0, A^0 →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 ≤ m_A^0 ≤ 9.3 GeV in the samples of 99×10^6 Υ(2S) and 122×10^6 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 A^0. We also limit the dimuon branching fraction of the η_b meson: B(η_b→µ^+µ^-)

Publication details
Download http://authors.library.caltech.edu/16238/1/Aubert2009p5858Phys_Rev_Lett.pdf
http://resolver.caltech.edu/CaltechAUTHORS:20091012-103908032
Publisher American Physical Society
Repository Caltech Authors (United States)
Type Article, PeerReviewed
Relation http://resolver.caltech.edu/CaltechAUTHORS:20091012-103908032
http://authors.library.caltech.edu/16238/