Speaker
Dr
Simon Eidelman
(Lebedev Physical Institute and Budker Institute)
Description
We report a new measurement of the $e^+e^-\to \Upsilon(nS)\pi^+\pi^-$ ($n=1,2,3$) cross sections at energies from 10.52 to 11.02 GeV,
where we observe a new structure in the energy dependence of the cross sections and
find evidence for the $\Upsilon(1S)\pi^+\pi^-$ production below the $B\bar{B}$ threshold.
Along with this we also present observation of $e^+e^- \to \gamma \chi_{c1}$ and search for $e^+e^- \to
\gamma \chi_{c0}$, $\gamma \chi_{c2}$ and $\gamma \eta_c$ at Belle.
The results are based on the data sample collected by the Belle detector at
the asymmetric energy $e^+e^-$ collider KEKB.
Primary author
Dr
Simon Eidelman
(Lebedev Physical Institute and Budker Institute)
