Measurement of the matrix elements for the decays η′ →ηπ+π- and η′ →ηπ0π0

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Abstract

Based on a sample of 1.31×109 J/ψ events collected with the BESIII detector, the matrix elements for the decays η′→ηπ+π- and η′→ηπ0π0 are determined using 351,016 η′→(η→γγ)π+π- and 56,249 η′→(η→γγ)π0π0 events with background levels less than 1%. Two commonly used representations are used to describe the Dalitz plot density. We find that an assumption of a linear amplitude does not describe the data well. A small deviation of the obtained matrix elements between η′→ηπ+π- and η′→ηπ0π0 is probably caused by the mass difference between charged and neutral pions or radiative corrections. No cusp structure in η′→ηπ0π0 is observed.

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Ablikim, M., Achasov, M. N., Ahmed, S., Albrecht, M., Amoroso, A., An, F. F., … Zou, J. H. (2018). Measurement of the matrix elements for the decays η′ →ηπ+π- and η′ →ηπ0π0. Physical Review D, 97(1). https://doi.org/10.1103/PhysRevD.97.012003

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