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Search for production of invisible final states in single-photon decays of Υ(1S)
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BABAR Collaboration (Including: Gershon, T. J. and Harrison, P. F.). (2011) Search for production of invisible final states in single-photon decays of Υ(1S). Physical Review Letters, Vol.107 (No.2). Article 021804 . doi:10.1103/PhysRevLett.107.021804 ISSN 0031-9007.
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Official URL: http://dx.doi.org/10.1103/PhysRevLett.107.021804
Abstract
We search for single-photon decays of the Gamma(1S) resonance, Gamma -> gamma + invisible, where the invisible state is either a particle of definite mass, such as a light Higgs boson A(0), or a pair of dark matter particles, chi(chi) over bar. Both A(0) and chi are assumed to have zero spin. We tag Gamma(1S) decays with a dipion transition Gamma(1S) -> pi(+)pi(-)Y(1S) and look for events with a single energetic photon and significant missing energy. We find no evidence for such processes in the mass range m(A0) <= 9.2 GeV and m(chi) <= 4.5 GeV in the sample of 98 x 10(6) Gamma(2S) decays collected with the BABAR detector and set stringent limits on new physics models that contain light dark matter states.
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