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論文

Search for a light $$CP$$-odd Higgs boson and low-mass dark matter at the Belle experiment

Seong, I. S.*; 谷田 聖; Belle Collaboration*; 他191名*

Physical Review Letters, 122(1), p.011801_1 - 011801_8, 2019/01

AA2019-0529.pdf:0.35MB

https://doi.org/10.1103/PhysRevLett.122.011801
 被引用回数：16 パーセンタイル：74.55(Physics, Multidisciplinary)

We report on the first Belle search for a light $$CP$$-odd Higgs boson, $$A^{0}$$, that decays into low mass dark matter, $$chi$$, in final states with a single photon and missing energy. We search for events produced via the dipion transition $$Upsilon(textrm{2S})rightarrowUpsilon(textrm{1S})pi^{+}pi^{-}$$, followed by the on-shell process $$Upsilon(textrm{1S})rightarrowgamma A^{0}$$ with $$A^{0} rightarrowchichi$$, or by the off-shell process $$Upsilon(textrm{1S})rightarrowgammachichi$$. Utilizing a data sample of 157.3 $$times$$ 10$$^{6}$$ $$Upsilon(textrm{2S})$$ decays, we find no evidence for a signal. We set limits on the branching fractions of such processes in the mass ranges $$M_{A^{0}} < 8.97$$ GeV/$$c^2$$ and $$M_{chi} < 4.44$$ GeV/$$c^2$$. We then use the limits on the off-shell process to set competitive limits on WIMP-nucleon scattering in the WIMP mass range below 5 GeV/$$c^2$$.

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