Journal
PHYSICAL REVIEW D
Volume 104, Issue 11, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.104.112006
Keywords
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Funding
- Ministry of Education, Culture, Sports, Science, and Technology (MEXT) of Japan
- Japan Society for the Promotion of Science (JSPS)
- Tau-Lepton Physics Research Center of Nagoya University
- Australian Research Council [DP180102629, DP170102389, DP170102204, DP150103061, FT130100303]
- Austrian Federal Ministry of Education, Science and Research (FWF)
- FWF Austrian Science Fund [P 31361-N36]
- National Natural Science Foundation of China [11435013, 11475187, 11521505, 11575017, 11675166, 11705209]
- Key Research Program of Frontier Sciences, Chinese Academy of Sciences (CAS) [QYZDJ-SSW-SLH011]
- CAS Center for Excellence in Particle Physics (CCEPP)
- Shanghai Science and Technology Committee (STCSM) [19ZR1403000]
- Ministry of Education, Youth and Sports of the Czech Republic [LTT17020]
- Horizon 2020 ERC Advanced Grant [884719]
- ERC [947006]
- Carl Zeiss Foundation
- Deutsche Forschungsgemeinschaft
- VolkswagenStiftung
- Department of Atomic Energy [RTI 4002]
- Department of Science and Technology of India
- Istituto Nazionale di Fisica Nucleare of Italy
- National Research Foundation (NRF) of Korea [2016R1D1A1B01010135, 2016R1D1A1B02012900, 2018R1A2B3003643, 2018R1A6A1A06024970, 2019K1A3A7A09033840, 2019R1I1A3A01058933, 2021R1A6A1A03043957, 2021R1F1A1060423, 2021R1F1A1064008]
- Polish Ministry of Science and Higher Education
- National Science Center
- Ministry of Science and Higher Education of the Russian Federation [14.W03.31.0026]
- HSE University Basic Research Program, Moscow
- University of Tabuk [S-1440-0321, S-0256-1438, S-0280-1439]
- Slovenian Research Agency [J1-9124, P1-0135]
- Ikerbasque, Basque Foundation for Science, Spain
- Swiss National Science Foundation
- Ministry of Education
- Ministry of Science and Technology of Taiwan
- United States Department of Energy
- National Science Foundation
- Excellence Cluster Universe
- Radiation Science Research Institute
- Foreign Large-size Research Facility Application Supporting project
- Global Science Experimental Data Hub Center of the Korea Institute of Science and Technology Information and KREONET/GLORIAD
- National Research Foundation of Korea [2021R1F1A1064008, 2021R1F1A1060423, 2021R1A6A1A03043957] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- European Research Council (ERC) [947006, 884719] Funding Source: European Research Council (ERC)
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In this study, the first observation of the processes e(+)e(-) -> Upsilon(1S, 2S)eta at a specific center-of-mass energy was reported, with measured Born cross sections and an upper limit set on another process. The results were obtained using data collected with the Belle detector at the KEKB collider.
We report the first observation of the processes e(+)e(-) -> Upsilon(1S, 2S)eta at root s = 10.866 GeV, with significance exceeding 10 sigma for both processes. The measured Born cross sections are sigma(e(+)e(-) -> Upsilon(2S)eta) = 2.07 +/- 0.21 +/- 0.19 pb, and sigma(e(+)e(-) -> Upsilon(1S)eta) = 0.42 +/- 0.08 +/- 0.04 pb. We also set the upper limit on the cross section of the process e(+)e(-) -> Upsilon(1S)eta to be sigma(e(+)e(-) -> Upsilon(1S)eta') < 0.037 pb at 90% C.L. 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 to 11.02 GeV.
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