Search for production of invisible final states in single-photon decays of Υ(1S).
| Author | :
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| Abstract | :
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 A⁰, or a pair of dark matter particles, χχ. Both A⁰ and χ are assumed to have zero spin. We tag Υ(1S) decays with a dipion transition Υ(2S) → π⁺π⁻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(A⁰) ≤ 9.2 GeV and m(χ) ≤ 4.5 GeV in the sample of 98 × 10⁶ Υ(2S) decays collected with the BABAR detector and set stringent limits on new physics models that contain light dark matter states. |
| Year of Publication | :
2011
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| Journal | :
Physical review letters
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| Volume | :
107
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| Issue | :
2
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| Number of Pages | :
021804
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| Date Published | :
2011 Jul 8
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| ISSN Number | :
0031-9007
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| URL | :
http://link.aps.org/abstract/PRL/v107/p021804
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| Short Title | :
Phys Rev Lett
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