Evidence of $h_{b}(\text{2P}) \to \Upsilon(\text{1S})\eta$ decay and search for $h_{b}(\text{1P,2P}) \to \Upsilon(\text{1S})\pi^0$ with the Belle detector
High Energy Physics - Experiment (hep-ex)
FOS: Physical sciences
DOI:
10.48550/arxiv.2407.03783
Publication Date:
2024-07-04
AUTHORS (167)
ABSTRACT
We report the first evidence for $h_{b}(\text{2P}) \to \Upsilon(\text{1S})\eta$ transition with a significance of $3.5$ standard deviations. The decay branching fraction is measured to be $\mathcal{B}[h_{b}(\text{2P}) \Upsilon(\text{1S})\eta]=(7.1 ~^{+3.7} _{-3.2}\pm 0.8)\times10^{-3}$, which noticeably smaller than expected. also set upper limits on $\pi^0$ transitions \Upsilon(\text{1S})\pi^0] < 1.8\times10^{-3}$, and $\mathcal{B}[h_{b}(\text{1P})\to at $90\%$ confidence level. These results are obtained $131.4$~fb$^{-1}$ data sample collected near $\Upsilon(\text{5S})$ resonance Belle detector KEKB asymmetric-energy $e^+e^-$ collider.
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