We present a new amplitude analysis of the ηπ D-wave in the reaction π− p → ηπ− p measured by COMPASS. Employing an analytical model based on the principles of the relativistic S-matrix, we find two resonances that can be identified with the a2(1320) and the excited a2(1700), and perform a comprehensive analysis of their pole positions. For the mass and width of the a2 we find M = (1307 ±1±6) MeV and Gamma = (112±1±8) MeV, and for the excited state a_2 we obtain M = (1720±10±60) MeV and Gamma = (280 ± 10 ± 70) MeV, respectively.
Titolo: | New analysis of ηπ tensor resonances measured at the COMPASS experiment |
Autori: | |
Data di pubblicazione: | 2018 |
Stato di pubblicazione: | Pubblicato |
Rivista: | |
Abstract: | We present a new amplitude analysis of the ηπ D-wave in the reaction π− p → ηπ− p measured by COMPASS. Employing an analytical model based on the principles of the relativistic S-matrix, we find two resonances that can be identified with the a2(1320) and the excited a2(1700), and perform a comprehensive analysis of their pole positions. For the mass and width of the a2 we find M = (1307 ±1±6) MeV and Gamma = (112±1±8) MeV, and for the excited state a_2 we obtain M = (1720±10±60) MeV and Gamma = (280 ± 10 ± 70) MeV, respectively. |
Handle: | http://hdl.handle.net/11368/2927773 |
Digital Object Identifier (DOI): | http://dx.doi.org/10.1016/j.physletb.2018.01.017 |
URL: | https://www.sciencedirect.com/science/article/pii/S037026931830025X |
Appare nelle tipologie: | 1.1 Articolo in Rivista |
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