TY - JOUR
T1 - Three-body final state interaction in η →3π
AU - Guo, Peng
AU - Danilkin, Igor V.
AU - Schott, Diane
AU - Fernández-Ramírez, C.
AU - Mathieu, V.
AU - Szczepaniak, Adam P.
N1 - Publisher Copyright:
© 2015 American Physical Society.
PY - 2015/9/11
Y1 - 2015/9/11
N2 - We present a unitary dispersive model for the η→3π decay process based upon the Khuri-Treiman equations which are solved by means of the Pasquier inversion method. The description of the hadronic final-state interactions for the η→3π decay is essential to reproduce the available data and to understand the existing discrepancies between Dalitz plot parameters from experiment and chiral perturbation theory. Our approach incorporates substraction constants that are fixed by fitting the recent high-statistics WASA-at-COSY data for η→π+π-π0. Based on the parameters obtained, we predict the slope parameter for the neutral channel to be α=-0.022±0.004. Through matching to next-to-leading-order chiral perturbation theory, we estimate the quark mass double ratio to be Q=21.4±0.4.
AB - We present a unitary dispersive model for the η→3π decay process based upon the Khuri-Treiman equations which are solved by means of the Pasquier inversion method. The description of the hadronic final-state interactions for the η→3π decay is essential to reproduce the available data and to understand the existing discrepancies between Dalitz plot parameters from experiment and chiral perturbation theory. Our approach incorporates substraction constants that are fixed by fitting the recent high-statistics WASA-at-COSY data for η→π+π-π0. Based on the parameters obtained, we predict the slope parameter for the neutral channel to be α=-0.022±0.004. Through matching to next-to-leading-order chiral perturbation theory, we estimate the quark mass double ratio to be Q=21.4±0.4.
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U2 - 10.1103/PhysRevD.92.054016
DO - 10.1103/PhysRevD.92.054016
M3 - Article
AN - SCOPUS:84943778835
SN - 1550-7998
VL - 92
JO - Physical Review D - Particles, Fields, Gravitation and Cosmology
JF - Physical Review D - Particles, Fields, Gravitation and Cosmology
IS - 5
M1 - 054016
ER -