Search for e⁺ e^- → γχ_bJ (J = 0, 1, 2) near √(s) = 10.746 GeV at Belle II

2025/08/22 by Belle II Collaboration, Abumusabh, M., Adachi, I. +399
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex)

paper · doi:10.48550/arxiv.2508.16036

Abstract

We search for the e⁺ e^- → γχ_bJ (J = 0, 1, 2) processes at center-of-mass energies √(s) = 10.653, 10.701, 10.746, and 10.804 GeV. These data were collected with the Belle II detector at the SuperKEKB collider and correspond to 3.5, 1.6, 9.8, and 4.7 fb^-1 of integrated luminosity, respectively. We set upper limits at the 90% confidence level on the Born cross sections for e⁺ e^- → γχ_bJ at each center-of-mass energy √(s) near 10.746 GeV. The upper limits at 90% confidence level on the Born cross sections for e⁺ e^- → γχ_b1 are significantly smaller than the corresponding measured values for e⁺e^-→ωχ_b1 and e⁺e^-→π⁺π^-Υ(2S) at √(s) = 10.746 GeV.

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