Kavli Affiliate: T. Higuchi
| First 5 Authors: Belle, Belle, , ,
| Summary:
We report a search for an axion-like particle $a$ in $Brightarrow K^(*) a
(rightarrowgammagamma)$ decays using data collected with the Belle detector
at the KEKB asymmetric energy electron-positron collider. The search is based
on a $711 mathrmfb^-1$ data sample collected at the $Upsilon 4S$
resonance energy, corresponding to a sample of $772times10^6$ $Upsilon 4S$
events. In this study, we search for the decay of the axion-like particle into
a pair of photons, $a rightarrow gammagamma$. We scan the two-photon
invariant mass in the range $0.16 mathrmGeV/c^2-4.50 mathrmGeV/c^2$ for
the $K$ modes and $0.16 mathrmGeV/c^2-4.20 mathrmGeV/c^2$ for the
$K^*$ modes. No significant signal is observed in any of the modes, and 90%
confidence level upper limits are established on the coupling to the $W$ boson,
$g_aW$, as a function of $a$ mass. The limits range from $3 times 10^-6
mathrmGeV^-1$ to $3 times 10^-5 mathrmGeV^-1$, improving the
current constraints on $g_aW$ by a factor of two over the most stringent
previous experimental results.
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