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Physical review letters · 2021

Triangle Singularity as the Origin of the a_{1}(1420).

СтатьяНазвание и аннотация: Перевод в очереди
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Alexeev G D, Alexeev M G, Amoroso A, Andrieux V, Anosov V, Antoshkin A, Augsten K, Augustyniak W, Azevedo C D R, Badełek B, Balestra F, Ball M, Barth J, Beck R, Bedfer Y, Berenguer Antequera J, Bernhard J, Bodlak M, Bradamante F, Bressan A, Burtsev V E, Chang W-C, Chatterjee C, Chiosso M, Chumakov A G, Chung S-U, Cicuttin A, Correia P M M, Crespo M L, D'Ago D, Dalla Torre S, Dasgupta S S, Dasgupta S, Denisenko I, Denisov O Yu, Donskov S V, Doshita N, Dreisbach Ch, Dünnweber W, Dusaev R R, Efremov A, Eversheim P D, Faccioli P, Faessler M, Finger M, Finger M, Fischer H, Franco C, Friedrich J M, Frolov V, Gautheron F, Gavrichtchouk O P, Gerassimov S, Giarra J, Gnesi I, Gorzellik M, Grasso A, Gridin A, Grosse Perdekamp M, Grube B, Guskov A, von Harrach D, Heitz R, Herrmann F, Horikawa N, d'Hose N, Hsieh C-Y, Huber S, Ishimoto S, Ivanov A, Iwata T, Jandek M, Jary V, Joosten R, Jörg P, Kabuß E, Kaspar F, Kerbizi A, Ketzer B, Khaustov G V, Khokhlov Yu A, Kisselev Yu, Klein F, Koivuniemi J H, Kolosov V N, Kondo Horikawa K, Konorov I, Konstantinov V F, Kotzinian A M, Kouznetsov O M, Koval A, Kral Z, Krinner F, Kulinich Y, Kunne F, Kurek K, Kurjata R P, Kveton A, Lavickova K, Levorato S, Lian Y-S, Lichtenstadt J, Lin P-J, Longo R, Lyubovitskij V E, Maggiora A, Magnon A, Makins N, Makke N, Mallot G K, Maltsev A, Mamon S A, Marianski B, Martin A, Marzec J, Matoušek J, Matsuda T, Mattson G, Meshcheryakov G V, Meyer M, Meyer W, Mikhailov Yu V, Mikhasenko M, Mitrofanov E, Mitrofanov N, Miyachi Y, Moretti A, Nagaytsev A, Naim C, Neyret D, Nový J, Nowak W-D, Nukazuka G, Nunes A S, Olshevsky A G, Ostrick M, Panzieri D, Parsamyan B, Paul S, Pekeler H, Peng J-C, Pešek M, Peshekhonov D V, Pešková M, Pierre N, Platchkov S, Pochodzalla J, Polyakov V A, Pretz J, Quaresma M, Quintans C, Reicherz G, Riedl C, Rudnicki T, Ryabchikov D I, Rybnikov A, Rychter A, Samoylenko V D, Sandacz A, Sarkar S, Savin I A, Sbrizzai G, Schmieden H, Selyunin A, Sinha L, Slunecka M, Smolik J, Srnka A, Steffen D, Stolarski M, Subrt O, Sulc M, Suzuki H, Sznajder P, Tessaro S, Tessarotto F, Thiel A, Tomsa J, Tosello F, Townsend A, Tskhay V, Uhl S, Vasilishin B I, Vauth A, Veit B M, Veloso J, Ventura B, Vidon A, Virius M, Wagner M, Wallner S, Zaremba K, Zavada P, Zavertyaev M, Zemko M, Zemlyanichkina E, Zhao Y, Ziembicki M

Аннотация

The COMPASS Collaboration experiment recently discovered a new isovector resonancelike signal with axial-vector quantum numbers, the a_{1}(1420), decaying to f_{0}(980)π. With a mass too close to and a width smaller than the axial-vector ground state a_{1}(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 a_{1}(1260) resonance into K^{*}(→Kπ)K[over ¯] and subsequent rescattering through a triangle singularity into the coupled f_{0}(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.

ИП Урсолов Владлен Сергеевич

ИНН 500118482352 · ОГРНИП 314500117700049

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