Search for Production of Invisible Final States in Single-Photon Decays of Upsilon(1S)

Details Search for Production of Invisible Final States in Single-Photon Decays of Upsilon(1S) Search for Production of Invisible Final States in Single-Photon Decays of Upsilon(1S)

2010-07-27

arxiv.org/abs/1007.4646v2

Phys.Rev.Lett.107:021804,2011

Physics

High Energy Physics

High Energy Physics - Experiment

8 pages, 5 figures; published in Phys. Rev. Lett 107, 021804 (2011)

Scientific paper

10.1103/PhysRevLett.107.021804

We search for single-photon decays of the Upsilon(1S) resonance, Upsilon->gamma+invisible, where the invisible state is either a particle of definite mass, such as a light Higgs boson A0, or a pair of dark matter particles, chi chi-bar. Both A0 and chi are assumed to have zero spin. We tag Upsilon(1S) decays with a dipion transition Upsilon(2S)->pi+pi-Upsilon(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 98e6 Upsilon(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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