Abstract: 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.

Cite: 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

Dates:

Submitted:	Jun 7, 2023
Accepted:	Aug 7, 2023
Published print:	Aug 24, 2023
Published online:	Aug 24, 2023

Identifiers:

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

Citing:

DB	Citing
OpenAlex	5
Scopus	5
Web of science	5
Elibrary	5

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