New analysis of ηπ tensor resonances measured at the COMPASS experiment

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https://doi.org/10.1016/j.physletb.2018.01.017
https://doi.org/10.1016/j.physletb.2018.01.017

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2018-04-10

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https://hdl.handle.net/2022/31611

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We present a new amplitude analysis of the ηπ D-wave in 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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Szczepaniak, Adam P., et al. "New analysis of ηπ tensor resonances measured at the COMPASS experiment." Physics Letters B, vol. 779, pp. 464-472, 2018-4-10, https://doi.org/10.1016/j.physletb.2018.01.017.

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Physics Letters B

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Faculty Open Access Articles