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1. chinaXiv:201609.00764 [pdf]

Search for a light CP-odd Higgs boson in radiative decays of J/ψ

Ablikim, M.
Subjects: Physics >> Nuclear Physics

We search for a light Higgs boson?A0?in the fully reconstructed decay chain of?J/ψ→γA0,?A0→μ+μ??using(225.0±2.8)×106?J/ψ?events collected by the BESIII experiment. The?A0?is a hypothetical CP-odd light Higgs boson predicted by many extensions of the Standard Model including two spin-0 doublets plus an extra singlet. We find no evidence for?A0?production and set?90%?confidence-level upper limits on the product branching fraction?B(J/ψ→γA0)×B(A0→μ+μ?)?in the range of?(2.8?495.3)×10?8?for?0.212≤mA0≤3.0GeV/c2. The new limits are?5?times below our previous results, and the nature of the?A0?is constrained to be mostly singlet.

submitted time 2016-09-12 Hits382Downloads227 Comment 0

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