A combined analysis of Y(2240) in the e+e-→K+K- and e+e-→KS0KL0 processes.
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| Title: | A combined analysis of Y(2240) in the e+e-→K+K- and e+e-→KS0KL0 processes. |
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| Authors: | Chen, Dian-Yong1,2 (AUTHOR) chendy@seu.edu.cn, Liu, Jing3 (AUTHOR) liujing@hue.edu.cn, Bai, Yu1 (AUTHOR) baiy@seu.edu.cn, Liu, Chun-Hua1 (AUTHOR) liuch@seu.edu.cn, Yan, Wen-Biao4 (AUTHOR) wenbiao@ustc.edu.cn, Meng, Zhao-Xia5 (AUTHOR) sps_mengzx@ujn.edu.cn |
| Source: | European Physical Journal C -- Particles & Fields. Dec2025, Vol. 85 Issue 12, p1-10. 10p. |
| Subjects: | Electron-positron interactions, Kaons, Data analysis, Mesons, Particle physics, Vector mesons, Isobaric spin |
| Abstract: | In the present work, we perform a combined analysis of the cross sections for e + e - → K + K - and e + e - → K S 0 K L 0 by including the interference between direct coupling process and resonance intermediate process. When setting the isospin factor as a free parameter, we can well reproduce the structures in the cross sections for e + e - → K + K - and e + e - → K S 0 K L 0 , however, the isospin factor deviates with the isospin symmetry conservation predicted value of one. By fixing the isospin factor to be one, we find the cross sections for e + e - → K + K - can be accurately fitted, while the same model parameters fail to adequately reproduce the observed cross section for the process e + e - → K S 0 K L 0 , which indicate that there should be contributions from other vector meson states, such as ρ (2150) and ω (2220). The combined analysis with ϕ (2170) , ω (2220) and ρ (2150) indicate that the inclusion of ρ (2150) can improve the descriptions of the cross sections for e + e - → K + K - and e + e - → K S 0 K L 0. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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| Abstract: | In the present work, we perform a combined analysis of the cross sections for e + e - → K + K - and e + e - → K S 0 K L 0 by including the interference between direct coupling process and resonance intermediate process. When setting the isospin factor as a free parameter, we can well reproduce the structures in the cross sections for e + e - → K + K - and e + e - → K S 0 K L 0 , however, the isospin factor deviates with the isospin symmetry conservation predicted value of one. By fixing the isospin factor to be one, we find the cross sections for e + e - → K + K - can be accurately fitted, while the same model parameters fail to adequately reproduce the observed cross section for the process e + e - → K S 0 K L 0 , which indicate that there should be contributions from other vector meson states, such as ρ (2150) and ω (2220). The combined analysis with ϕ (2170) , ω (2220) and ρ (2150) indicate that the inclusion of ρ (2150) can improve the descriptions of the cross sections for e + e - → K + K - and e + e - → K S 0 K L 0. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 14346044 |
| DOI: | 10.1140/epjc/s10052-025-15109-6 |
