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Search for di-muon decays of a low-mass Higgs boson in radiative decays of the \Upsilon(1S)

By J. P. Lees, V. Poireau, V. Tisserand, D. Bernard, M. Verderi, S. Emery, G. Hamel De Monchenault, G. Vasseur, Ch. Yèche, S. Akar, E. Ben-Haim, M. Bomben, G.R. Bonneaud, H. Briand, G. Calderini, J. Chauvau, O. Hamon, Ph. Leruste, G. Marchiori, J. Ocariz, S. Sitt, N. Arnaud, M. Davier, D. Derkach, G. Grosdidier, F. Le Diberder, A. M. Lutz, B. Malaescu, P. Roudeau, M. H. Schune, A. Stocchi and G. Wormser

Abstract

9 pages, 6 postscript figures, submitted to PRD-RC - See paper for full list of authorsWe 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

Topics: [ PHYS.HEXP ] Physics [physics]/High Energy Physics - Experiment [hep-ex]
Publisher: American Physical Society
Year: 2013
DOI identifier: 10.1103/PhysRevD.87.031102
OAI identifier: oai:HAL:in2p3-00737695v1
Provided by: Hal-Diderot
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