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- W2968228669 abstract "In this article, the analyticity of triangle loop integral with complex masses of internal particles is discussed in a new perspective, based on which we obtain the explicit width dependence of the absorptive part of the triangle amplitude. We reanalyze the decay pattern of $ensuremath{eta}(1405/1475)$ with the width effects included in the triangle singularity (TS) mechanism. Based on the present experimental information, we provide a self-consistent description of the $Koverline{K}ensuremath{pi}$, $ensuremath{eta}ensuremath{pi}ensuremath{pi}$, and $3ensuremath{pi}$ decay channels for $ensuremath{eta}(1405/1475)$. Our results confirm the claim that the TS mechanism plays a decisive role in the understanding of the $ensuremath{eta}(1405)$ and $ensuremath{eta}(1475)$ puzzle. Namely, the observed differences of $ensuremath{eta}$ resonances within the mass region of 1.40--1.48 GeV are originated from the same state. For the isospin violated process $J/ensuremath{psi}ensuremath{rightarrow}ensuremath{gamma}ensuremath{eta}(1405/1475)ensuremath{rightarrow}{f}_{0}(980)ensuremath{pi}ensuremath{rightarrow}3ensuremath{pi}$, we identify an additional contribution to the ${a}_{0}(980)ensuremath{-}{f}_{0}(980)$ mixing via the TS mechanism." @default.
- W2968228669 created "2019-08-22" @default.
- W2968228669 creator A5047891113 @default.
- W2968228669 creator A5061527538 @default.
- W2968228669 date "2019-08-13" @default.
- W2968228669 modified "2023-10-18" @default.
- W2968228669 title "Internal particle width effects on the triangle singularity mechanism in the study of the <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mi>η</mml:mi><mml:mo stretchy=false>(</mml:mo><mml:mn>1405</mml:mn><mml:mo stretchy=false>)</mml:mo></mml:math> and <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mi>η</mml:mi><mml:mo stretchy=false>(</mml:mo><mml:mn>1475</mml:mn><mml:mo stretchy=false>)</mml:mo></mml:math> puzzle" @default.
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- W2968228669 doi "https://doi.org/10.1103/physrevd.100.036005" @default.
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