Triangle Singularity as the Origin of the a1(1420); Physical Review Letters; Vol. 127, iss. 8
| Parent link: | Physical Review Letters Vol. 127, iss. 8.— 2021.— [082501, 7 p.] |
|---|---|
| Corporate Authors: | , |
| Other Authors: | , , , , , , , , |
| Summary: | 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. |
| Language: | English |
| Published: |
2021
|
| Subjects: | |
| Online Access: | https://doi.org/10.1103/PhysRevLett.127.082501 |
| Format: | Electronic Book Chapter |
| KOHA link: | https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=668069 |
MARC
| LEADER | 00000naa0a2200000 4500 | ||
|---|---|---|---|
| 001 | 668069 | ||
| 005 | 20251106122842.0 | ||
| 035 | |a (RuTPU)RU\TPU\network\39293 | ||
| 035 | |a RU\TPU\network\39291 | ||
| 090 | |a 668069 | ||
| 100 | |a 20220603d2021 k||y0rusy50 ba | ||
| 101 | 0 | |a eng | |
| 102 | |a US | ||
| 135 | |a drcn ---uucaa | ||
| 181 | 0 | |a i | |
| 182 | 0 | |a b | |
| 200 | 1 | |a Triangle Singularity as the Origin of the a1(1420) |f G. D. Alekseev, M. G. Alekseev, S. V. Donskov [et al.] | |
| 203 | |a Text |c electronic | ||
| 300 | |a Title screen | ||
| 320 | |a [References: 52 tit.] | ||
| 330 | |a 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. | ||
| 461 | |t Physical Review Letters | ||
| 463 | |t Vol. 127, iss. 8 |v [082501, 7 p.] |d 2021 | ||
| 610 | 1 | |a электронный ресурс | |
| 610 | 1 | |a труды учёных ТПУ | |
| 701 | 1 | |a Alekseev |b G. D. |g Georgy Dmitrievich | |
| 701 | 1 | |a Alekseev |b M. G. |g Maksim | |
| 701 | 1 | |a Donskov |b S. V. |g Sergey Vasiljevich | |
| 701 | 1 | |a Burtsev |b V. E. |c mathematician |c Senior Lecturer of Tomsk Polytechnic University |f 1991- |g Vitaly Evgenjevich |3 (RuTPU)RU\TPU\pers\38282 | |
| 701 | 1 | |a Chumakov |b A. G. |c physicist |c laboratory assistant-researcher of Tomsk Polytechnic University |f 1992- |g Aleksandr Grigorjevich |3 (RuTPU)RU\TPU\pers\41079 | |
| 701 | 1 | |a Dusaev |b R. R. |c specialist in the field of nuclear physics |c Engineer of Tomsk Polytechnic University |f 1988- |g Renat Ramilyevich |3 (RuTPU)RU\TPU\pers\30972 |9 15210 | |
| 701 | 1 | |a Lyubovitskiy (Lyubovitskij) |b V. E. |c physicist |c Professor of Tomsk Polytechnic University, Doctor of physical and mathematical sciences, Professor of the University of Tubingen (Germany) |f 1963- |g Valery Efimovich |3 (RuTPU)RU\TPU\pers\33385 |9 17080 | |
| 701 | 1 | |a Mamon |b S. A. |c physicist |c laboratory assistant-researcher of Tomsk Polytechnic University |f 1989- |g Sergey Aleksandrovich |3 (RuTPU)RU\TPU\pers\43559 | |
| 701 | 1 | |a Vasilishin |b B. I. |c engineer-physicist |c laboratory researcher at Tomsk Polytechnic University |f 1990- |g Bogdan Ivanovich |3 (RuTPU)RU\TPU\pers\37572 |9 20428 | |
| 712 | 0 | 2 | |a Национальный исследовательский Томский политехнический университет |b Исследовательская школа физики высокоэнергетических процессов |c (2017- ) |3 (RuTPU)RU\TPU\col\23551 |
| 712 | 0 | 2 | |a Национальный исследовательский Томский политехнический университет |b Школа базовой инженерной подготовки |b Отделение математики и информатики |3 (RuTPU)RU\TPU\col\23555 |
| 801 | 0 | |a RU |b 63413507 |c 20220603 |g RCR | |
| 856 | 4 | |u https://doi.org/10.1103/PhysRevLett.127.082501 | |
| 942 | |c CF | ||