Search for Production of Invisible Final States in Single-Photon Decays of Upsilon(1S)
arXiv:1007.4646 · doi:10.1103/PhysRevLett.107.021804
Abstract
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.
8 pages, 5 figures; published in Phys. Rev. Lett 107, 021804 (2011)
References in corpus (6)
- Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
- Cosmological Constraints from the SDSS Luminous Red Galaxies
- First results from DAMA/LIBRA and the combined results with DAMA/NaI
- Probing NMSSM Scenarios with Minimal Fine-Tuning by Searching for Decays of the Upsilon to a Light CP-Odd Higgs Boson
- Discovering the Higgs with Low Mass Muon Pairs
- Hunting a light CP-odd non-standard Higgs boson through its tauonic decay at a (Super) B factory