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Search for Invisible Decays of a Light Scalar in Radiative Transitions Υ(3S) → γA 0 The BABAR Collaboration

By B. Aubert, J. Garra Tico, E. Grauges, L. Lopez Ab, A. Palano Ab, G. Eigen, B. Stugu, L. Sun, G. S. Abrams, M. Battaglia, D. N. Brown, R. N. Cahn, R. G. Jacobsen, L. T. Kerth, Yu. G. Kolomensky, G. Lynch, I. L. Osipenkov, M. T. Ronan, K. Tackmann, T. Tanabe, C. M. Hawkes, N. Soni, A. T. Watson, H. Koch and T. Schroeder


We search for a light scalar particle produced in single-photon decays of the Υ(3S) resonance through the process Υ(3S) → γ + A 0, A 0 → invisible. Such an object appears in Next-to-Minimal Supersymmetric extensions of the Standard Model, where a light CP-odd Higgs boson naturally couples strongly to b-quarks. If, in addition, there exists a light, stable neutralino, decays of A 0 could be preferentially to an invisible final state. We search for events with a single high-energy photon and a large missing mass, consistent with a 2-body decay of Υ(3S). We find no evidence for such processes in a sample of 122 × 10 6 Υ(3S) decays collected by the BABAR collaboration at the PEP-II B-factory, and set 90 % C.L. upper limits on the branching fraction B(Υ(3S) → γA 0) × B(A 0 → invisible) at (0.7 − 31) × 10 −6 in the mass range m A 0 ≤ 7.8 GeV. The results ar

Year: 2008
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