Triangle Singularity as the Origin of the a1(1420)

Triangle Singularity as the Origin of the a1(1420)

Dettagli Bibliografici
Parent link:	Physical Review Letters Vol. 127, iss. 8.— 2021.— [082501, 7 p.]
Enti autori:	Национальный исследовательский Томский политехнический университет Исследовательская школа физики высокоэнергетических процессов, Национальный исследовательский Томский политехнический университет Школа базовой инженерной подготовки Отделение математики и информатики
Altri autori:	Alekseev G. D. Georgy Dmitrievich, Alekseev M. G. Maksim, Donskov S. V. Sergey Vasiljevich, Burtsev V. E. Vitaly Evgenjevich, Chumakov A. G. Aleksandr Grigorjevich, Dusaev R. R. Renat Ramilyevich, Lyubovitskiy (Lyubovitskij) V. E. Valery Efimovich, Mamon S. A. Sergey Aleksandrovich, Vasilishin B. I. Bogdan Ivanovich
Riassunto:	Title screen The COMPASS Collaboration experiment recently discovered a new isovector resonancelike signal with axial-vector quantum numbers, the a1(1420), decaying to f0(980)π. With a mass too close to and a width smaller than the axial-vector ground state a1(1260), it was immediately interpreted as a new light exotic meson, similar to the X, Y, Z states in the hidden-charm sector. We show that a resonancelike signal fully matching the experimental data is produced by the decay of the a1(1260) resonance into K∗(→Kπ)¯K and subsequent rescattering through a triangle singularity into the coupled f0(980)π channel. The amplitude for this process is calculated using a new approach based on dispersion relations. The triangle-singularity model is fitted to the partial-wave data of the COMPASS experiment. Despite having fewer parameters, this fit shows a slightly better quality than the one using a resonance hypothesis and thus eliminates the need for an additional resonance in order to describe the data. We thereby demonstrate for the first time in the light-meson sector that a resonancelike structure in the experimental data can be described by rescattering through a triangle singularity, providing evidence for a genuine three-body effect.
Lingua:	inglese
Pubblicazione:	2021
Soggetti:	электронный ресурс труды учёных ТПУ
Accesso online:	https://doi.org/10.1103/PhysRevLett.127.082501
Natura:	Elettronico Capitolo di libro
KOHA link:	https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=668069

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