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

Belle実験における奇$$CP$$を持つ軽いヒッグス粒子と軽い暗黒物質の探索

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

Seong, I. S.*; Tanida, Kiyoshi; Belle Collaboration*; 191 of others*

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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パーセンタイル:75

分野:Physics, Multidisciplinary

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