# New analysis of $\eta\pi$ tensor resonances measured at the COMPASS experiment

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.
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https://hal.archives-ouvertes.fr/hal-01757858
Contributor : Inspire Hep <>
Submitted on : Wednesday, April 4, 2018 - 9:50:05 AM
Last modification on : Wednesday, November 25, 2020 - 8:48:04 AM

### Citation

A. Jackura, C. Fernández-Ramírez, A. Pilloni, V. Mathieu, J. Nys, et al.. New analysis of $\eta\pi$ tensor resonances measured at the COMPASS experiment. Phys.Lett.B, 2018, 779, pp.464-472. ⟨10.1016/j.physletb.2018.01.017⟩. ⟨hal-01757858⟩

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