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.

New analysis of ηπ tensor resonances measured at the COMPASS experiment

Birsa, R.;Bradamante, F.;Bressan, A.;Chatterjee, C.;Dalla Torre, S.;Dasgupta, S. S.;Dasgupta, S.;Kerbizi, A.;Levorato, S.;Makke, N.;Martin, A.;Matoušek, J.;Sbrizzai, G.;Schiavon, P.;Szabelski, A.;Tessaro, S.;Tessarotto, F.;
2018-01-01

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.
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https://www.sciencedirect.com/science/article/pii/S037026931830025X
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/2927773
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