First measurement of the masses of the $\Upsilon_1(1D)$ and $\Upsilon_3(1D)$ states and the energy dependence of the cross sections for $e^+e^-\to\Upsilon_J(1D)\eta$ and $e^+e^-\to\Upsilon_J(1D)\pi^+\pi^-$

Sumitted to PubDB: 2025-09-03

Category: Physics / performance paper

Principal Authors	Sen Jia, Chengping Shen, Zhiqing Liu, Yong Xie
Date	2026-11-05
Working group	Quarkonium
Belle II Number	BELLE2-PUB-PH-2025-051
Abstract	We study the processes $e^+e^-\to\Upsilon_J(1D)\eta$ and $\Upsilon_J(1D)\pi^+\pi^-$ ($J$ = 1, 2, 3) at center-of-mass energies $\sqrt{s}$ from 10.73 GeV to 11.02 GeV using a $142.5\,\mathrm{fb}^{-1}$ data sample collected with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider. The results for the Born cross sections at each energy point are given. The energy dependences of the $e^+e^-\to\Upsilon_J(1D)\eta$ and $e^+e^\to\Upsilon_J(1D)\pi^+\pi^-$ cross sections are determined. The branching fractions of $\Upsilon(10860)$ decaying into $\Upsilon_J(1D)\eta$ and $\Upsilon_J(1D)\pi^+\pi^-$ are obtained. We measure the masses of the $\Upsilon_J(1D)$ states.
ArXiv	https://arxiv.org/abs/2607.04369
Journal	Phys.Rev.Lett.
Preprint Number	2026-014