Observation of the Radiative Decays of ψ (1S) to χc1

Authors

P. Katrenko, P.N. Lebedev Physical Institute of the Russian Academy of Sciences
I. Adachi, The Graduate University for Advanced Studies
H. Aihara, The University of Tokyo
S. Al Said, King Abdulaziz University
D. M. Asner, Brookhaven National Laboratory
T. Aushev, Moscow Institute of Physics and Technology
I. Badhrees, King Abdulaziz City for Science and Technology
S. Bahinipati, Indian Institute of Technology Bhubaneswar
P. Behera, Indian Institute of Technology Madras
C. Beleño, Universität Göttingen
J. Bennett, University of Mississippi
V. Bhardwaj, Indian Institute of Science Education and Research Mohali
B. Bhuyan, Indian Institute of Technology Guwahati
J. Biswal, Jozef Stefan Institute
A. Bobrov, Budker Institute of Nuclear Physics of the Siberian Branch of the RAS
G. Bonvicini, Wayne State University
M. Bračko, Jozef Stefan Institute
M. Campajola, Istituto Nazionale di Fisica Nucleare, Sezione di Napoli
L. Cao, Karlsruhe Institute of Technology
D. Červenkov, Charles University
V. Chekelian, Max Planck Institute for Physics (Werner Heisenberg Institute)
A. Chen, National Central University Taiwan
B. G. Cheon, Hanyang University
K. Chilikin, P.N. Lebedev Physical Institute of the Russian Academy of Sciences
H. E. Cho, Hanyang University
K. Cho, Korea Institute of Science and Technology Information
S. K. Choi, Gyeongsang National University
Y. Choi, Sungkyunkwan University
S. Choudhury, Indian Institute of Technology Hyderabad
D. Cinabro, Wayne State University
S. Cunliffe, Deutsches Elektronen-Synchrotron (DESY)
F. Di Capua, Istituto Nazionale di Fisica Nucleare, Sezione di Napoli

Document Type

Article

Publication Date

3-27-2020

Abstract

© 2020 authors. Published by the American Physical Society. We report the first observation of the radiative decay of the ψ(1S) into a charmonium state. The significance of the observed signal of ψ(1S)→γχc1 is 6.3 standard deviations including systematics. The branching fraction is calculated to be B[ψ(1S)→γχc1]=[4.7-1.8+2.4(stat)-0.5+0.4(sys)×10-5]. We also searched for ψ(1S) radiative decays into χc0,2 and ηc(1S,2S), and set upper limits on their branching fractions. These results are obtained from a 24.9 fb-1 data sample collected with the Belle detector at the KEKB asymmetric-energy e+e- collider at a center-of-mass energy equal to the ψ(2S) mass using ψ(1S) tagging by the ψ(2S)→ψ(1S)π+π- transitions.

Relational Format

journal article

Recommended Citation

Katrenko, P., Adachi, I., Aihara, H., Al Said, S., Asner, D. M., Aushev, T., Badhrees, I., Bahinipati, S., Behera, P., Beleño, C., Bennett, J., Bhardwaj, V., Bhuyan, B., Biswal, J., Bobrov, A., Bonvicini, G., Bračko, M., Campajola, M., Cao, L., … Belle Collaboration. (2020). Observation of the Radiative Decays of ϒ ( 1 S ) to χ c 1. Physical Review Letters, 124(12), 122001. https://doi.org/10.1103/PhysRevLett.124.122001