新山　雅之
   所属   京都産業大学  理学部 物理科学科
   職種   教授
発行・発表の年月 2021/08
形態種別 その他
標題 Study of $e^+e^-\to Υ(\rm1S,2S)η$ and $e^+e^-\to Υ(\rm 1S)η^{\prime}$ at $\sqrt{s}=10.866$ GeV with the Belle detector
執筆形態 その他
著者・共著者 Belle Collaboration,E. Kovalenko,A. Garmash,P. Krokovny,I. Adachi,H. Aihara,D. M. Asner,V. Aulchenko,T. Aushev,R. Ayad,V. Babu,S. Bahinipati,P. Behera,J. Bennett,M. Bessner,T. Bilka,J. Biswal,A. Bobrov,A. Bondar,G. Bonvicini,A. Bozek,M. Bračko,T. E. Browder,M. Campajola,L. Cao,D. Červenkov,M. -C. Chang,B. G. Cheon,K. Chilikin,H. E. Cho,K. Cho,S. -J. Cho,S. -K. Choi,Y. Choi,S. Choudhury,D. Cinabro,S. Cunliffe,S. Das,G. De Nardo,F. Di Capua,Z. Doležal,T. V. Dong,S. Eidelman,D. Epifanov,T. Ferber,A
概要 We report the first observation of the processes $e^+e^-\to\Upsilon(\rm
1S,2S)\eta$ at $\sqrt{s}=10.866$~GeV with a $10.2\sigma$ and $16.5\sigma$
significance respectively. The measured Born cross sections are $\sigma(e^+e^-
\to \Upsilon(2S)\eta)=2.07 \pm 0.21 \pm 0.19$~pb, and $\sigma(e^+e^- \to
\Upsilon(\rm 1S)\eta)=0.42 \pm 0.08 \pm 0.04$~pb. We also set the upper limit
on the cross section of the process $e^+e^- \to \Upsilon(\rm 1S)\eta^{\prime}$
to be $\sigma(e^+e^- \to \Upsilon(\rm 1S)\eta^{\prime})<0.035$~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.
PermalinkURL http://arxiv.org/abs/2108.04426v1
researchmap用URL http://arxiv.org/pdf/2108.04426v1