English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

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 singlephoton and missing energy. We search for events produced via the dipiontransition$\Upsilon(\textrm{2S})\rightarrow\Upsilon(\textrm{1S})\pi^{+}\pi^{-}$, followedby the on-shell process $\Upsilon(\textrm{1S})\rightarrow\gamma A^{0}$ with$A^{0} \rightarrow\chi\chi$, or by the off-shell process$\Upsilon(\textrm{1S})\rightarrow\gamma\chi\chi$. Utilizing a data sample of157.3 $\times$ 10$^{6}$ $\Upsilon(\textrm{2S})$ decays, we find no evidence fora signal. We set limits on the branching fractions of such processes in themass ranges $M_{A^{0}} <$ 8.97 $\textrm{GeV/}\textit{c}^{2}$ and $M_{\chi} <$4.44 $\textrm{GeV/}\textit{c}^{2}$. We then use the limits on the off-shellprocess to set competitive limits on WIMP-nucleon scattering in the WIMP massrange below 5 $\textrm{GeV/}\textit{c}^{2}$.

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