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. |
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| 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] |
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| Database: | Engineering Source |
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| 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] |
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| ISSN: | 14346044 |
| DOI: | 10.1140/epjc/s10052-026-15426-4 |
