Coupled-Channel Analysis of the χ_{c1}(3872) Line Shape with BESIII Data.

M Ablikim, M N Achasov, P Adlarson, X C Ai, R Aliberti, A Amoroso, M R An, Q An, Y Bai, O Bakina, I Balossino, Y Ban, V Batozskaya, K Begzsuren, N Berger, M Berlowski, M Bertani, D Bettoni, F Bianchi, E Bianco, A Bortone, I Boyko,R A Briere, A Brueggemann, H Cai, X Cai, A Calcaterra,G F Cao, N Cao, S A Cetin,J F Chang, T T Chang, W L Chang, G R Che, G Chelkov,C Chen,Chao Chen, G Chen,H S Chen, M L Chen, S J Chen, S M Chen, T Chen,X R Chen,X T Chen, Y B Chen, Y Q Chen,Z J Chen,W S Cheng,S K Choi, X Chu, G Cibinetto, S C Coen, F Cossio, J J Cui,H L Dai,J P Dai, A Dbeyssi,R E de Boer, D Dedovich,Z Y Deng, A Denig, I Denysenko, M Destefanis,F De Mori, B Ding, X X Ding, Y Ding, Y Ding, J Dong,L Y Dong,M Y Dong, X Dong, M C Du,S X Du, Z H Duan, P Egorov, Y L Fan, J Fang,S S Fang, W X Fang,Y Fang, R Farinelli, L Fava, F Feldbauer, G Felici, C Q Feng,J H Feng, K Fischer, M Fritsch, C Fritzsch, C D Fu, J L Fu, Y W Fu, H Gao,Y N Gao,Yang Gao, S Garbolino, I Garzia, P T Ge, Z W Ge, C Geng, E M Gersabeck, A Gilman, K Goetzen, L Gong, W X Gong, W Gradl, S Gramigna, M Greco, M H Gu,Y T Gu, C Y Guan, Z L Guan, A Q Guo,L B Guo, M J Guo,R P Guo,Y P Guo, A Guskov, T T Han, W Y Han, X Q Hao,F A Harris,K K He,K L He, F H H Heinsius, C H Heinz,Y K Heng, C Herold, T Holtmann, P C Hong, G Y Hou, X T Hou, Y R Hou,Z L Hou,H M Hu,J F Hu, T Hu, Y Hu,G S Huang,K X Huang, L Q Huang,X T Huang,Y P Huang, T Hussain, N Hüsken, W Imoehl, M Irshad, J Jackson, S Jaeger, S Janchiv, J H Jeong, Q Ji, Q P Ji,X B Ji,X L Ji, Y Y Ji, X Q Jia, Z K Jia,H J Jiang, P C Jiang,S S Jiang,T J Jiang,X S Jiang, Y Jiang, J B Jiao, Z Jiao, S Jin, Y Jin, M Q Jing, T Johansson, X K, S Kabana, N Kalantar-Nayestanaki,X L Kang,X S Kang, R Kappert,M Kavatsyuk, B C Ke, A Khoukaz, R Kiuchi, R Kliemt, O B Kolcu, B Kopf, M Kuessner, A Kupsc, W Kühn, J J Lane, P Larin, A Lavania, L Lavezzi, T T Lei, Z H Lei, H Leithoff, M Lellmann, T Lenz,C Li,C Li,C H Li,Cheng Li, D M Li, F Li,G Li,H Li,H B Li,H J Li,H N Li,Hui Li,J R Li,J S 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Zhang,J W Zhang,J X Zhang, J Y Zhang,J Z Zhang,Jianyu Zhang,Jiawei Zhang,L M Zhang,L Q Zhang,Lei Zhang, P Zhang, Q Y Zhang,Shuihan Zhang,Shulei Zhang,X D Zhang,X M Zhang, X Y Zhang,Xuyan Zhang, Y Zhang, Y Zhang, Y T Zhang, Y H Zhang,Yan Zhang, Yao Zhang,Z H Zhang,Z L Zhang, Z Y Zhang, Z Y Zhang,G Zhao,J Zhao,J Y Zhao,J Z Zhao,Lei Zhao,Ling Zhao,M G Zhao,S J Zhao,Y B Zhao,Y X Zhao,Z G Zhao, A Zhemchugov,B Zheng,J P Zheng,W J Zheng, Y H Zheng, B Zhong, X Zhong, H Zhou, L P Zhou,X Zhou,X K Zhou,X R Zhou,X Y Zhou,Y Z Zhou,J Zhu, K Zhu,K J Zhu, L Zhu, L X Zhu, S H Zhu, S Q Zhu,T J Zhu,W J Zhu, Y C Zhu, Z A Zhu, J H Zou, J Zu,BESIII Collaboration

Physical review letters(2024)

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摘要
We perform a study of the χ_{c1}(3872) line shape using the data samples of e^{+}e^{-}→γχ_{c1}(3872), χ_{c1}(3872)→D^{0}D[over ¯]^{0}π^{0}, and π^{+}π^{-}J/ψ collected with the BESIII detector. The effects of the coupled channels and the off-shell D^{*0} are included in the parametrization of the line shape. The line shape mass parameter is obtained to be M_{X}=(3871.63±0.13_{-0.05}^{+0.06})  MeV. Two poles are found on the first and second Riemann sheets corresponding to the D^{*0}D[over ¯]^{0} branch cut. The pole location on the first sheet is much closer to the D^{*0}D[over ¯]^{0} threshold than the other, and is determined to be 7.04±0.15_{-0.08}^{+0.07}  MeV above the D^{0}D[over ¯]^{0}π^{0} threshold with an imaginary part -0.19±0.08_{-0.19}^{+0.14}  MeV.
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