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

Belle Collaboration

doi:10.1103/PhysRevLett.124.122001

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

Belle Collaboration

Yonsei University
RAS - P.N. Lebedev Physics Institute
Moscow Institute of Physics and Technology
The Graduate University for Advanced Studies
High Energy Accelerator Research Organization, Tsukuba
The University of Tokyo
King Abdulaziz University
University of Tabuk
Brookhaven National Laboratory
King Abdulaziz City for Science and Technology
Indian Institute of Technology Bhubaneswar
Indian Institute of Technology Madras
University of Göttingen
University of Mississippi
Indian Institute of Science Education and Research Mohali
Indian Institute of Technology Guwahati
Jožef Stefan Institute
RAS - Budker Institute of Nuclear Physics
Novosibirsk State University
Wayne State University
University of Maribor
National Institute for Nuclear Physics
University of Naples Federico II
Karlsruhe Institute of Technology
Charles University
Max Planck Institute for Physics (Werner Heisenberg Institute)
National Central University
Hanyang University
Korea Institute of Science and Technology Information
Gyeongsang National University
Sungkyunkwan University
Indian Institute of Technology Hyderabad
German Electron Synchrotron
Université Paris-Sud
Fudan University
Pacific Northwest National Laboratory
Panjab University
Virginia Polytechnic Institute and State University
University of Ljubljana
H. Niewodniczanski Institute of Nuclear Physics
University of Hawai'i at Mānoa
Niigata University

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3 Scopus citations

Abstract

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.

Original language	English
Article number	122001
Journal	Physical Review Letters
Volume	124
Issue number	12
DOIs	https://doi.org/10.1103/PhysRevLett.124.122001
State	Published - 27 Mar 2020

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10.1103/PhysRevLett.124.122001

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@article{21014f7d343c492e8757089595e209e0,

title = "Observation of the Radiative Decays of ψ (1S) to χc1",

abstract = "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.",

author = "\{Belle Collaboration\} and P. Katrenko and I. Adachi and H. Aihara and \{Al Said\}, S. and Asner, \{D. M.\} and T. Aushev and I. Badhrees and S. Bahinipati and P. Behera and C. Bele{\~n}o and J. Bennett and V. Bhardwaj and B. Bhuyan and J. Biswal and A. Bobrov and G. Bonvicini and M. Bra{\v c}ko and M. Campajola and L. Cao and D. {\v C}ervenkov and V. Chekelian and A. Chen and Cheon, \{B. G.\} and K. Chilikin and Cho, \{H. E.\} and K. Cho and Choi, \{S. K.\} and Y. Choi and S. Choudhury and D. Cinabro and S. Cunliffe and \{Di Capua\}, F. and \{Di Carlo\}, S. and Z. Dole{\v Z}al and Dong, \{T. V.\} and S. Eidelman and D. Epifanov and Fast, \{J. E.\} and Fulsom, \{B. G.\} and R. Garg and V. Gaur and N. Gabyshev and A. Garmash and A. Giri and P. Goldenzweig and B. Golob and O. Grzymkowska and O. Hartbrich and K. Hayasaka and H. Park",

note = "Publisher Copyright: {\textcopyright} 2020 authors. Published by the American Physical Society.",

year = "2020",

month = mar,

day = "27",

doi = "10.1103/PhysRevLett.124.122001",

language = "English",

volume = "124",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "12",

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TY - JOUR

T1 - Observation of the Radiative Decays of ψ (1S) to χc1

AU - Belle Collaboration

AU - Katrenko, P.

AU - Adachi, I.

AU - Aihara, H.

AU - Al Said, S.

AU - Asner, D. M.

AU - Aushev, T.

AU - Badhrees, I.

AU - Bahinipati, S.

AU - Behera, P.

AU - Beleño, C.

AU - Bennett, J.

AU - Bhardwaj, V.

AU - Bhuyan, B.

AU - Biswal, J.

AU - Bobrov, A.

AU - Bonvicini, G.

AU - Bračko, M.

AU - Campajola, M.

AU - Cao, L.

AU - Červenkov, D.

AU - Chekelian, V.

AU - Chen, A.

AU - Cheon, B. G.

AU - Chilikin, K.

AU - Cho, H. E.

AU - Cho, K.

AU - Choi, S. K.

AU - Choi, Y.

AU - Choudhury, S.

AU - Cinabro, D.

AU - Cunliffe, S.

AU - Di Capua, F.

AU - Di Carlo, S.

AU - DoleŽal, Z.

AU - Dong, T. V.

AU - Eidelman, S.

AU - Epifanov, D.

AU - Fast, J. E.

AU - Fulsom, B. G.

AU - Garg, R.

AU - Gaur, V.

AU - Gabyshev, N.

AU - Garmash, A.

AU - Giri, A.

AU - Goldenzweig, P.

AU - Golob, B.

AU - Grzymkowska, O.

AU - Hartbrich, O.

AU - Hayasaka, K.

AU - Park, H.

PY - 2020/3/27

Y1 - 2020/3/27

N2 - 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.

AB - 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.

UR - https://www.scopus.com/pages/publications/85083545972

U2 - 10.1103/PhysRevLett.124.122001

DO - 10.1103/PhysRevLett.124.122001

M3 - Article

C2 - 32281835

AN - SCOPUS:85083545972

SN - 0031-9007

VL - 124

JO - Physical Review Letters

JF - Physical Review Letters

IS - 12

M1 - 122001

ER -

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

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