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Unified study of Bs0→X(3872)π+π-(K+K-) and Bs0→ψ(2S)π+π-(K+K-) processes.

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Title: Unified study of Bs0→X(3872)π+π-(K+K-) and Bs0→ψ(2S)π+π-(K+K-) processes.
Authors: Chen, Yun-Hua1 (AUTHOR) yhchen@ustb.edu.cn
Source: European Physical Journal C -- Particles & Fields. Feb2026, Vol. 86 Issue 2, p1-9. 9p.
Subjects: Particle decays, Particle interactions, Branching ratios, Tetraquark, Charmonium
Abstract: We perform a unified description of the experimental data of the π + π - invariant mass spectra of B s 0 → ψ (2 S) π + π - , the π + π - and K + K - invariant mass spectra of B s 0 → X (3872) π + π - (K + K -) , and the ratio of branch fractions B [ B s 0 → X (3872) (K + K -) non - ϕ ] / B [ B s 0 → X (3872) π + π - ] . The strong final state interactions between the two pseudoscalars are taken into account using a parametrization fulfilling unitarity and analyticity. We find that there is universality in the coupling constants for B s 0 → ψ (2 S) π + π - and B s 0 → J / ψ π + π - processes. While the couplings of B s 0 → X (3872) π + π - are about half of magnitude smaller than the couplings of B s 0 → ψ (2 S) π + π - , which indicates that the X(3872) is different from a pure charmonium state. Furthermore, we find that the f 0 (1500) plays an important role in the B s 0 → ψ (2 S) π + π - and the B s 0 → X (3872) π + π - (K + K -) processes, though the phase space of B s 0 → X (3872) f 0 (1500) is small. Also we predict the ratio of branch fractions B [ B s 0 → ψ (2 S) (K + K -) non - ϕ ] / B [ B s 0 → ψ (2 S) π + π - ] and the K + K - invariant mass distribution of B s 0 → ψ (2 S) K + K - . [ABSTRACT FROM AUTHOR]
Copyright of European Physical Journal C -- Particles & Fields is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Unified study of Bs0→X(3872)π+π-(K+K-) and Bs0→ψ(2S)π+π-(K+K-) processes.
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  Data: <searchLink fieldCode="AR" term="%22Chen%2C+Yun-Hua%22">Chen, Yun-Hua</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> yhchen@ustb.edu.cn</i>
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  Data: <searchLink fieldCode="JN" term="%22European+Physical+Journal+C+--+Particles+%26+Fields%22">European Physical Journal C -- Particles & Fields</searchLink>. Feb2026, Vol. 86 Issue 2, p1-9. 9p.
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  Data: <searchLink fieldCode="DE" term="%22Particle+decays%22">Particle decays</searchLink><br /><searchLink fieldCode="DE" term="%22Particle+interactions%22">Particle interactions</searchLink><br /><searchLink fieldCode="DE" term="%22Branching+ratios%22">Branching ratios</searchLink><br /><searchLink fieldCode="DE" term="%22Tetraquark%22">Tetraquark</searchLink><br /><searchLink fieldCode="DE" term="%22Charmonium%22">Charmonium</searchLink>
– Name: Abstract
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  Data: We perform a unified description of the experimental data of the π + π - invariant mass spectra of B s 0 → ψ (2 S) π + π - , the π + π - and K + K - invariant mass spectra of B s 0 → X (3872) π + π - (K + K -) , and the ratio of branch fractions B [ B s 0 → X (3872) (K + K -) non - ϕ ] / B [ B s 0 → X (3872) π + π - ] . The strong final state interactions between the two pseudoscalars are taken into account using a parametrization fulfilling unitarity and analyticity. We find that there is universality in the coupling constants for B s 0 → ψ (2 S) π + π - and B s 0 → J / ψ π + π - processes. While the couplings of B s 0 → X (3872) π + π - are about half of magnitude smaller than the couplings of B s 0 → ψ (2 S) π + π - , which indicates that the X(3872) is different from a pure charmonium state. Furthermore, we find that the f 0 (1500) plays an important role in the B s 0 → ψ (2 S) π + π - and the B s 0 → X (3872) π + π - (K + K -) processes, though the phase space of B s 0 → X (3872) f 0 (1500) is small. Also we predict the ratio of branch fractions B [ B s 0 → ψ (2 S) (K + K -) non - ϕ ] / B [ B s 0 → ψ (2 S) π + π - ] and the K + K - invariant mass distribution of B s 0 → ψ (2 S) K + K - . [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of European Physical Journal C -- Particles & Fields is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1140/epjc/s10052-026-15426-4
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      – SubjectFull: Branching ratios
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      – SubjectFull: Tetraquark
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              Text: Feb2026
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