Journal article
Evidence of (1S) →j /ψ χc1 and search for double-charmonium production in (1S) and (2S) decays
SD Yang, CP Shen, Y Ban, A Abdesselam, I Adachi, H Aihara, S Al Said, K Arinstein, DM Asner, V Aulchenko, T Aushev, R Ayad, AM Bakich, V Bansal, P Behera, B Bhuyan, A Bobrov, A Bozek, M Bračko, TE Browder Show all
Physical Review D Particles Fields Gravitation and Cosmology | Published : 2014
Abstract
Using data samples of 102×106 (1S) and 158×106 (2S) events collected with the Belle detector, a first experimental search has been made for double-charmonium production in the exclusive decays (1S,2S)→J/ψ(ψ′)+X, where X=ηc, χcJ(J=0,1,2), ηc(2S), X(3940), and X(4160). No significant signal is observed in the spectra of the mass recoiling against the reconstructed J/ψ or ψ′ except for the evidence of χc1 production with a significance of 4.6σ for (1S)→J/ψ+χc1. The measured branching fraction B((1S)→J/ψ+χc1) is [3.90±1.21(stat)±0.23(syst)]×10-6. The 90% C.L. upper limits on the branching fractions of the other modes having a significance of less than 3σ are determined. These results are consist..
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Awarded by Austrian Science Fund
Awarded by National Natural Science Foundation of China
Awarded by Fundamental Research Funds for the Central Universities
Awarded by Ministry of Education, Youth and Sports of the Czech Republic
Awarded by National Research Foundation (NRF) of Korea
Awarded by Basic Research Lab program under NRF
Awarded by Center for Korean J-PARC Users
Awarded by Euskal Herriko Unibertsitatea (UPV/EHU) (Spain)
Awarded by Grants-in-Aid for Scientific Research
Funding Acknowledgements
We thank the KEKB group for the excellent operation of the accelerator; the KEK cryogenics group for the efficient operation of the solenoid; and the KEK computer group, the National Institute of Informatics, and the PNNL/EMSL computing group for valuable computing and SINET4 network support. We acknowledge support from the Ministry of Education, Culture, Sports, Science, and Technology (MEXT) of Japan, the Japan Society for the Promotion of Science (JSPS), and the Tau-Lepton Physics Research Center of Nagoya University; the Australian Research Council and the Australian Department of Industry, Innovation, Science and Research; Austrian Science Fund under Grants No. P 22742-N16 and No. P 26794-N20; the National Natural Science Foundation of China under Contracts No. 10575109, No. 10775142, No. 10875115, No. 11175187, and No. 11475187, the Fundamental Research Funds for the Central Universities under Contract No. YWF-14-WLXY-013 and CAS center for Excellence in Particle Physics (China); the Ministry of Education, Youth and Sports of the Czech Republic under Contract No. LG14034; the Carl Zeiss Foundation, the Deutsche Forschungsgemeinschaft and the VolkswagenStiftung; the Department of Science and Technology of India; the Istituto Nazionale di Fisica Nucleare of Italy; National Research Foundation (NRF) of Korea Grants No. 2011-0029457, No. 2012-0008143, No. 2012R1A1A2008330, No. 2013R1A1A3007772, No. 2014R1A2A2A01005286, No. 2014R1A2A2A01002734, No. 2014R1A1A2006456; the Basic Research Lab program under NRF Grants No. KRF-2011-0020333, No. KRF-2011-0021196, Center for Korean J-PARC Users, No. NRF2013K1A3A7A06056592; the Brain Korea 21-Plus program and the Global Science Experimental Data Hub Center of the Korea Institute of Science and Technology Information; the Polish Ministry of Science and Higher Education and the National Science Center; the Ministry of Education and Science of the Russian Federation and the Russian Federal Agency for Atomic Energy; the Slovenian Research Agency; the Basque Foundation for Science (IKERBASQUE) and the Euskal Herriko Unibertsitatea (UPV/EHU) under program UFI 11/55 (Spain); the Swiss National Science Foundation; the National Science Council and the Ministry of Education of Taiwan; and the U.S. Department of Energy and the National Science Foundation. This work is supported by a Grant-in-Aid from MEXT for Science Research in a Priority Area ("New Development of Flavor Physics") and from JSPS for Creative Scientific Research ("Evolution of Tau-lepton Physics").