Реферат: The current situation with the recently discovered a0(1700/1800) resonance is very paradoxical: it is believed that a0(1700/1800) must be strongly coupled with two vector mesons, but there is no direct experimental confirmation of this yet. Based on the assumption that the a0(1700/1800) is a state similar to the four-quark state from the MIT bag, belonging to either the9 or the 36 q2¯ q2 multiplet, we analyze the influence of the strong a0(1700/1800) coupling to the vector channels K ¯ K, ρϕ, and ρω on its line shape in the decay channels into pseudoscalar mesons K ¯ K, πη, and πη0. This effect depends on the location of the resonance mass ma0 relative to the nominal thresholds of vector channels. For example, if ma0 ≈1700 MeV, then the influence turns out to be hidden in a fairly wide range of coupling constants. On the whole, our analysis shows that, to confirm the presence of the strong a0(1700/1800) coupling to the vector channels, utterly required is the direct detection of the decays a0(1700/1800) → K ¯ K;ρϕ;ρω. The appearance of even certain hints at the existence of these decays would make it possible to fundamentally advance in understanding the nature of the new a0 state.

Библиографическая ссылка: Achasov N. . , Shestakov G. .
Coupled-channel influence on the a0(1700/1800) line shape
Physical Review D: Particles and fields. 2023. V.108. N3. 036018 :1-9. DOI: 10.1103/PhysRevD.108.036018 WOS Scopus РИНЦ OpenAlex

Даты:

Поступила в редакцию:	7 июн. 2023 г.
Принята к публикации:	7 авг. 2023 г.
Опубликована в печати:	24 авг. 2023 г.
Опубликована online:	24 авг. 2023 г.

Идентификаторы БД:

Web of science:	WOS:001106714700003
Scopus:	2-s2.0-85170369957
РИНЦ:	63908652
OpenAlex:	W4386135371

Цитирование в БД:

БД	Цитирований
OpenAlex	6
Scopus	6
Web of science	7
РИНЦ	5

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