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 Γ=(112±1±8) MeV, and for the excited state a2′ we obtain M=(1720±10±60) MeV and Γ=(280±10±70) MeV, respectively.

New analysis of eta-pi tensor resonances measured at the COMPASS experiment / Jackura, A., Fernández-Ramírez, C., Mikhasenko, M., Pilloni, A., Mathieu, V., Nys, J., Pauk, V., Szczepaniak, A.P., Fox, G., Aghasyan, M., Akhunzyanov, R., Alexeev, M.G., Alexeev, G.D., Amoroso, A., Andrieux, V., Anfimov, N.V., Anosov, V., Antoshkin, A., Augsten, K., Augustyniak, W., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 779:(2018), pp. 464-472. [10.1016/j.physletb.2018.01.017]

New analysis of eta-pi tensor resonances measured at the COMPASS experiment

Pilloni, A.;
2018

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 Γ=(112±1±8) MeV, and for the excited state a2′ we obtain M=(1720±10±60) MeV and Γ=(280±10±70) MeV, respectively.
2018
Nuclear and high energy physics; peripheral photoproduction; physics
01 Pubblicazione su rivista::01a Articolo in rivista
New analysis of eta-pi tensor resonances measured at the COMPASS experiment / Jackura, A., Fernández-Ramírez, C., Mikhasenko, M., Pilloni, A., Mathieu, V., Nys, J., Pauk, V., Szczepaniak, A.P., Fox, G., Aghasyan, M., Akhunzyanov, R., Alexeev, M.G., Alexeev, G.D., Amoroso, A., Andrieux, V., Anfimov, N.V., Anosov, V., Antoshkin, A., Augsten, K., Augustyniak, W., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 779:(2018), pp. 464-472. [10.1016/j.physletb.2018.01.017]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1079229
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