TY - JOUR

T1 - Observation of Charmonium h_{c} Radiative Decays to Multiple Light Hadrons and the Tensor State f_{2}(1270)

AU - BESIII Collaboration

AU - Achasov, M. N.

AU - Nikolaev, I. B.

AU - Su, S. S.

AU - Мучной, Николай Юрьевич

N1 - Observation of Charmonium h_{c} Radiative Decays to Multiple Light Hadrons and the Tensor State f_{2}(1270) / The BESIII Collaboration // Physical Review Letters. - 2025. - Т. 134. - № 24. - С. 241902. DOI: 10.1103/v4hf-s8x8 The BESIII Collaboration thanks the staff of BEPCII and the IHEP computing center for their strong support. This work is supported in part by National Key R&D Program of China under Contracts No. 2020YFA0406300, No. 2020YFA0406400, and No. 2023YFA1606000; National Natural Science Foundation of China (NSFC) under Contracts No. 12375070, No. 11635010, No. 11735014, No. 11935015, No. 11935016, No. 11935018, No. 12025502, No. 12035009, No. 12035013, No. 12061131003, No. 12192260, No. 12192261, No. 12192262, No. 12192263, No. 12192264, No. 12192265, No. 12221005, No. 12225509, No. 12235017, and No. 12361141819; the Chinese Academy of Sciences (CAS) Large-Scale Scientific Facility Program; the CAS Center for Excellence in Particle Physics (CCEPP); the Shanghai Leading Talent Program of Eastern Talent Plan under Contract No. JLH5913002; the Joint Large-Scale Scientific Facility Funds of the NSFC and CAS under Contracts No. U2032108 and No. U1832207; the 100 Talents Program of CAS; the Institute of Nuclear and Particle Physics (INPAC) and Shanghai Key Laboratory for Particle Physics and Cosmology; the German Research Foundation DFG under Contract No. FOR5327; Istituto Nazionale di Fisica Nucleare, Italy; the Knut and Alice Wallenberg Foundation under Contracts No. 2021.0174 and No. 2021.0299; the Ministry of Development of Turkey under Contract No. DPT2006K-120470; the National Research Foundation of Korea under Contract No. NRF2022R1A2C1092335; the National Science and Technology fund of Mongolia; the National Science Research and Innovation Fund (NSRF) via the Program Management Unit for Human Resources & Institutional Development, Research, and Innovation of Thailand under Contracts No. B16F640076, and No. B50G670107; the Polish National Science Centre under Contract No. 2019/35/O/ST2/02907; the Swedish Research Council under Contract No. 2019.04595; the Swedish Foundation for International Cooperation in Research and Higher Education under Contract No. CH2018-7756; and the U.S. Department of Energy under Contract No. DEFG02-05ER41374.

PY - 2025/6/17

Y1 - 2025/6/17

N2 - Using ψ(3686)→π^{0}h_{c} decays from a data sample of (27.12±0.14)×10^{8}  ψ(3686) events collected by the BESIII detector at the BEPCII collider, h_{c} radiative decays to multiple light hadrons below 2.8  GeV/c^{2}-γπ^{+}π^{-}, γπ^{+}π^{-}η, γ2(π^{+}π^{-}), and γpp[over ¯]-are observed for the first time, each with a significance greater than 5σ. The corresponding branching fractions are measured. Furthermore, intermediate states are investigated, leading to the first observation of the decay process of h_{c}→γf_{2}(1270)→γπ^{+}π^{-} with a significance of 5.1σ. This observation represents the first instance of h_{c} radiative decay to a tensor state.

AB - Using ψ(3686)→π^{0}h_{c} decays from a data sample of (27.12±0.14)×10^{8}  ψ(3686) events collected by the BESIII detector at the BEPCII collider, h_{c} radiative decays to multiple light hadrons below 2.8  GeV/c^{2}-γπ^{+}π^{-}, γπ^{+}π^{-}η, γ2(π^{+}π^{-}), and γpp[over ¯]-are observed for the first time, each with a significance greater than 5σ. The corresponding branching fractions are measured. Furthermore, intermediate states are investigated, leading to the first observation of the decay process of h_{c}→γf_{2}(1270)→γπ^{+}π^{-} with a significance of 5.1σ. This observation represents the first instance of h_{c} radiative decay to a tensor state.

UR - https://www.scopus.com/pages/publications/105012804844

UR - https://www.mendeley.com/catalogue/b90f350c-0c16-3044-868f-9f03ed53b942/

U2 - 10.1103/v4hf-s8x8

DO - 10.1103/v4hf-s8x8

M3 - Article

C2 - 40742926

VL - 134

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

IS - 24

M1 - 241902

ER -