arxiv: 1704.08033 · v3 · ★pith:3QIVRL3Gnew · submitted 2017-04-26 · ✦ hep-ex
Observation of e⁺e⁻ to η h_{c} at center-of-mass energies from 4.085 to 4.600 GeV
BESIII collaboration: M.Ablikim
,
M.N.Achasov
,
S. Ahmed
,
X.C.Ai
,
O.Albayrak
,
M.Albrecht
,
D.J.Ambrose
,
A.Amoroso
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center-of-masscrosssectionbornenergiesobservedsqrtbesiii
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We observe for the first time the process $e^{+}e^{-} \rightarrow \eta h_c$ with data collected by the BESIII experiment. Significant signals are observed at the center-of-mass energy $\sqrt{s}=4.226$ GeV, and the Born cross section is measured to be $(9.5^{+2.2}_{-2.0} \pm 2.7)$ pb. Evidence for $\eta h_c$ is observed at $\sqrt{s}=4.358$ GeV with a Born cross section of $(10.0^{+3.1}_{-2.7} \pm 2.6)$ pb, and upper limits on the production cross section at other center-of-mass energies between 4.085 and 4.600 GeV are determined.
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