Реферат: For coupled channels D0Kþ, DþK0, Dþs η, and Dþs π0, the S-wave scattering amplitudes are constructed taking into account the mixing of the isoscalar resonance D s0 ð2317Þþ with nonresonance amplitudes with isospin I ¼ 1. The phenomenological approach we use allows us to quite simply clear up the general structure of the D s0 ð2317Þþ → Dþs π0 decay amplitude violating isospin. We show that the phase of this amplitude coincides with the phase of the nonresonanct Dþs π0 scattering amplitude in agreement with the Watson theorem. Its modulus squared, as it should be, determines the width of the resonance peak in the Dþs π0 channel. Taking into account the π0 − η mixing in internal lines up to the second order inclusively ensures that the unitarity condition is fulfilled. The presented analysis complements the description of the D s0 ð2317Þþ → Dþs π0 decay based on the coupled channel unitarized chiral perturbation theory. The numerical estimates obtained by us for the D s0 ð2317Þþ → Dþs π0 decay width do not contradict those available in the literature.

Библиографическая ссылка: Achasov N.N. , Shestakov G.N.
Phenomenological description of the $D^*_{s0}(2317)\to D_s\pi^0$ decay
Physical Review D: Particles and fields. 2025. V.112. P.096004. DOI: 10.1103/jwkb-3zl9 OpenAlex

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Поступила в редакцию:	21 авг. 2025 г.
Принята к публикации:	30 сент. 2025 г.
Опубликована в печати:	4 нояб. 2025 г.
Опубликована online:	4 нояб. 2025 г.

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W4415897925

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