Study of e⁺e^-→ Υ(\rm1S,2S)η and e⁺e^-→ Υ(\rm 1S)η^′ at √(s)=10.866 GeV with the Belle detector

2021/08/10 by Belle Collaboration, Kovalenko, E., Garmash, A. +179
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex)

paper · doi:10.48550/arxiv.2108.04426

Abstract

We report the first observation of the processes e⁺e^-→Υ(\rm 1S,2S)η at √(s)=10.866~GeV with a 10.2σ and 16.5σ significance respectively. The measured Born cross sections are σ(e⁺e^- → Υ(2S)η)=2.07 ± 0.21 ± 0.19~pb, and σ(e⁺e^- → Υ(\rm 1S)η)=0.42 ± 0.08 ± 0.04~pb. We also set the upper limit on the cross section of the process e⁺e^- → Υ(\rm 1S)η^′ to be σ(e⁺e^- → Υ(\rm 1S)η^′)<0.035~pb at 90% CL. The results are obtained with the data sample collected with the Belle detector at the KEKB asymmetric-energy e⁺e^- collider in the energy range from 10.63~GeV to 11.02~GeV.

Related

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