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| Preprint/Report | PUBDB-2018-05224 |
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2018
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Please use a persistent id in citations: doi:10.3204/PUBDB-2018-05224
Report No.: Belle Preprint-2018-22; KEK Preprint-2018-55; arXiv:1810.10291
Abstract: Using data samples of 89.5~fb$^{-1}$, 711.0~fb$^{-1}$, and 121.4~fb$^{-1}$ collected with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider at center-of-mass energies 10.52 GeV, 10.58 GeV, and 10.867 GeV, respectively, we study the exclusive reactions $e^+e^-\to\gamma\chi_{cJ}$ ($J = 0,~1,~2$) and $e^+e^-\to\gamma\eta_c$. A significant $\gamma \chi_{c1}$ signal is observed for the first time at $\sqrt{s}=10.58$ GeV with a significance of $5.1\sigma$ including systematic uncertainties. No significant excesses for $\gamma \chi_{c0}$, $\gamma \chi_{c2}$, and $\gamma \eta_c$ final states are found, and we set 90\% credibility level upper limits on the Born cross sections ($\sigma_{\rm B}$) at 10.52 GeV, 10.58 GeV, and 10.867~GeV. Together with cross sections measured by BESIII at lower center-of-mass energies, the energy dependency of $\sigma_{\rm B}(e^+e^-\to\gamma\chi_{c1})$ is obtained.
Keyword(s): electron positron: annihilation ; electron positron: colliding beams ; channel cross section: measured ; energy dependence ; chi/c0(3415) ; chi/c1(3510) ; chi/c2(3555) ; photon: spectrum ; BELLE ; exclusive reaction ; KEK-B ; BES ; channel cross section: upper limit ; Born approximation ; tree approximation ; experimental results ; electron positron --> photon chi/c0(3415) ; electron positron --> photon chi/c1(3510) ; electron positron --> photon chi/c2(3555) ; 10.58 GeV-cms
; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; IF < 5 ; Published
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Report/Journal Article
Observation of $e ^+ e ^− → γ χ_{ c 1}$ and search for $e ^+ e^ − → γ χ_ {c 0} , γ χ_{ c 2}$ , and $γ η_ c$ at $\sqrt{s}$ near 10.6 GeV at Belle
Physical review / D 98(9), 092015 (2018) [10.1103/PhysRevD.98.092015]
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