Search for Production of Invisible Final States in Single-Photon Decays of Gamma(1S)
Author(s)
Dujmic, Denis; Sciolla, Gabriella; Zhao, M.; Cowan, Ray F![Thumbnail](/bitstream/handle/1721.1/67318/Sanchez-2011-Search%20for%20Production.pdf.jpg?sequence=6&isAllowed=y)
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We search for single-photon decays of the Υ(1S) resonance, Υ→γ+invisible, where the invisible state is either a particle of definite mass, such as a light Higgs boson A[superscript 0], or a pair of dark matter particles, χχ̅ . Both A[superscript 0] and χ are assumed to have zero spin. We tag Υ(1S) decays with a dipion transition Υ(2S)→π[superscript +]π[superscript -]Υ(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[subscript A[superscript 0]]≤9.2 GeV and m[subscript χ]≤4.5 GeV in the sample of 98×10[superscript 6] Υ(2S) decays collected with the BABAR detector and set stringent limits on new physics models that contain light dark matter states.
Date issued
2011-07Department
Massachusetts Institute of Technology. Laboratory for Nuclear ScienceJournal
Physical Review Letters
Publisher
American Physical Society
Citation
del Amo Sanchez, P. et al. “Search for Production of Invisible Final States in Single-Photon Decays of Υ(1S).” Physical Review Letters 107 (2011): n. pag. Web. 30 Nov. 2011. © 2011 American Physical Society
Version: Final published version
ISSN
0031-9007