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    Aubert, B.; Karyotakis, Y.; Lees, J.P.; Poireau, V.; Prencipe, E.; Prudent, X.; Tisserand, V.; Garra Tico, J.; Grauges, E.; Martinelli, M.; Palano, A.; Pappagallo, M.; Eigen, G.; Stugu, B.; Sun, L.; Battaglia, M.; Brown, D.N.; Kerth, L.T.; Kolomensky, Yu. G.; Lynch, G.; Osipenkov, I.L.; Petigura, E.; Tackmann, K.; Tanabe, T.; Hawkes, C.M.; Soni, N.; Watson, A.T.; Koch, H.; Schroeder, T.; Asgeirsson, D.J.; Fulsom, B.G.; Hearty, C.; Mattison, T.S.; Mckenna, J.A.; Barrett, M.; Khan, A.; Randle-Conde, A.; Blinov, V.E.; Bukin, A.D.; Buzykaev, A.R.; Druzhinin, V.P.; Golubev, V.B.; Onuchin, A.P.; Serednyakov, S.I.; Skovpen, Yu. I.; Solodov, E.P.; Todyshev, K. Yu; Bondioli, M.; Curry, S.; Eschrich, I.; Kirkby, D.; Lankford, A.J.; Lund, P.; Mandelkern, M.; Martin, E.C.; Stoker, D.P.; Atmacan, H.; Gary, J.W.; Liu, F.; Long, O.; Vitug, G.M.; Yasin, Z.; Sharma, V.; Campagnari, C.; Hong, T.M.; Kovalskyi, D.; Mazur, M.A.; Richman, J.D.; Beck, T.W.; Eisner, A.M.; Heusch, C.A.; Kroseberg, J.; Lockman, W.S.; Martinez, A.J.; Schalk, T.; Schumm, B.A.; Seiden, A.; Wang, L.; Winstrom, L.O.; Cheng, C.H.; Doll, D.A.; Echenard, B.; Fang, F.; Hitlin, D.G.; Narsky, I.; Ongmongkolku, P.; Piatenko, T.; Porter, F.C.; Andreassen, R.; Mancinelli, G.; Meadows, B.T.; Mishra, K.; Sokoloff, M.D.; Bloom, P.C.; Ford, W.T.; Gaz, A.; Hirschauer, J.F.; Nagel, M.; Nauenberg, U.; Smith, J.G.

    Physical review letters, 08/2009, Letnik: 103
    Journal Article

    We search for evidence of a light scalar boson in the radiative decays of the Υ ( 2 S ) and Υ ( 3 S ) resonances: Υ ( 2 S , 3 S ) → γ A 0 , A 0 → μ + μ − . Such a particle appears in extensions of the standard model, where a light C P -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 ( 2 S ) and 122 × 10 6 Υ ( 3 S ) 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 − ) < 0.9 % at 90% confidence level.