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Physical Review D 87 (2013) 031102
Search for di-muon decays of a low-mass Higgs boson in radiative decays of the \Upsilon(1S)
J. P. Lees1, V. Poireau1, V. Tisserand1, D. Bernard2, M. Verderi2, S. Emery3, G. Hamel de Monchenault3, G. Vasseur3, Ch. Yèche3, S. Akar4, E. Ben-Haim4, M. Bomben4, G.R. Bonneaud4, H. Briand4, G. Calderini4, J. Chauvau4, O. Hamon4, Ph. Leruste4, G. Marchiori4, J. Ocariz4, S. Sitt4, N. Arnaud5, M. Davier5, D. Derkach5, G. Grosdidier5, F. Le Diberder5, A. M. Lutz5, B. Malaescu5, P. Roudeau5, M. H. Schune5, A. Stocchi5, G. Wormser5
For the BABAR collaboration(s)
(2013)

We search for di-muon decays of a low-mass Higgs boson (A^0) produced in radiative \Upsilon(1S) decays. The \Upsilon(1S) sample is selected by tagging the pion pair in the \Upsilon(2S, 3S) \to \pi^+ \pi^- \Upsilon(1S) transitions, using a data sample of 92.8 \times 10^6 \Upsilon(2S) and 116.8 \times 10^6 \Upsilon(3S) events collected by the \babar\ detector. We find no evidence for A^0 production and set 90% confidence level upper limits on the product branching fraction \mathcal{B} (\Upsilon(1S) \to \gamma A^0) \times \mathcal{B} (A^0 \to \mumu) in the range of (0.28 - 9.7) \times 10^{-6} for 0.212 \le m_{A^0} \le 9.20 GeV/c^2. The results are combined with our previous measurements of \Upsilon(2S,3S) \to \gamma A^0, A^0 \to \mumu to set limits on the effective coupling of the \b-quark to the A^0.
1:  LAPP - Laboratoire d'Annecy le Vieux de Physique des Particules
2:  LLR - Laboratoire Leprince-Ringuet
3:  IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers (ex DAPNIA)
4:  LPNHE - Laboratoire de Physique Nucléaire et de Hautes Énergies
5:  LAL - Laboratoire de l'Accélérateur Linéaire
Physics/High Energy Physics - Experiment
Fulltext link: 
http://fr.arXiv.org/abs/1210.0287