Understand
We search for a light scalar particle produced in single-photon decays of the Upsilon(3S) resonance through the process Upsilon(3S) -> gamma A0, A0 -> invisible.
- Such an object appears in Next-to-Minimal Supersymmetric extensions of the Standard Model, where a light CP-odd Higgs boson naturally couples strongly to b-quarks.
- If, in addition, there exists a light, stable neutralino, decays of A0 could be preferentially to an invisible final state.
- We search for events with a single high-energy photon and a large missing mass, consistent with a 2-body decay of Upsilon(3S).
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