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| Preprint/Report | PUBDB-2018-03260 |
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2018
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Please use a persistent id in citations: doi:10.3204/PUBDB-2018-03260
Report No.: Belle-preprint-2018-12; KEK-Preprint-2018-18; arXiv:1806.06203
Abstract: We report searches for the processes $e^+e^-\to\pi^+\pi^-\pi^0\chi_{bJ}$ and $e^+e^-\to\phi\chi_{bJ}$ (J=1,2) in the vicinity of the $\Upsilon(11020)$ resonance using energy scan data collected by the Belle experiment at the KEKB collider. We observe $e^+e^-\to \pi^+\pi^-\pi^0\chi_{b1}$ and find evidence for $e^+e^-\to \omega\chi_{b2}$ processes for data with center-of-mass energies from 10.96 to 11.05~GeV for the first time. The statistical significance for $\pi^+\pi^-\pi^0\chi_{b1}$ and $\omega\chi_{b2}$ are $6.1\sigma$ and $4.0\sigma$, respectively. We investigate energy dependence of the $e^+e^-\to\pi^+\pi^-\pi^0\chi_{bJ}$ cross section and find that it is consistent with production of $\Upsilon(10860)$ and $\Upsilon(11020)$ resonances without significant non-resonant contribution. Assuming $e^+e^-\to \pi^+\pi^-\pi^0\chi_{bJ}$ proceeds via $\Upsilon(10860)$ and $\Upsilon(11020)$, the branching fraction $\mathcal{B}(\Upsilon(11020)\to\pi^+\pi^-\pi^0\chi_{bJ})=(8.6\pm4.1\pm6.1^{+4.5}_{-2.5})\times10^{-3}$ is measured for the first time, where the first error is statistical, the second is systematic, and the third from the branching fraction of $\Upsilon(11020)\to e^+e^-$. The signals for $e^+e^-\to \phi\chi_{bJ}$ are not significant, and the upper limits of the Born cross sections at the 90\% confidence level are $0.6$ and $1.0$~pb for $e^+e^-\to \phi\chi_{b1}$ and $\phi\chi_{b2}$, respectively, for center-of-mass energies from 10.96 to 11.05~GeV.
Keyword(s): electron positron: annihilation ; electron positron: colliding beams ; error: statistical ; Upsilon(10870): electroproduction ; Upsilon(11020): electroproduction ; chi mesons: electroproduction ; Upsilon(11020): branching ratio: measured ; energy dependence ; BELLE ; KEK-B ; tree approximation ; Born approximation ; channel cross section: upper limit ; experimental results ; electron positron --> chi mesons pi+ pi- pi0 ; Upsilon(11020) --> pi+ pi- pi0 chi mesons ; Upsilon(11020) --> electron positron ; electron positron --> Phi(1020) chi mesons ; 10.96-11.02 GeV-cms
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Report/Journal Article
Observation of $e^+e^-\to\pi^+\pi^-\pi^0\chi_{b1,2}(1P)$ and search for $e^+e^-\to\phi\chi_{b1,2}(1P)$ at $\sqrt{s}$ = 10.96$-$11.05 Ge
Physical review / D 98(9), 091102 (2018) [10.1103/PhysRevD.98.091102]
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