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- W2744034354 abstract "The decay width of $N(1535)rightarrow Neta$ is as large as that of $N(1535)rightarrow Npi$. This is in evident conflict with simple expectations based on flavor symmetry and phase space. Similarly, the decay width of $Lambda(1670) rightarrow Lambda(1116) eta $ is larger than predicted by flavor symmetry. In this work, we propose that the axial $U(1)_{A}$ anomaly is responsible for an enhanced coupling of (some) excited baryons to the $eta$ meson. We test this idea by including a new, chirally symmetric but $U(1)_{A}$ anomalous, term in an effective hadronic model decribing baryons and their chiral partners in the mirror assignment. This term enhances the decay of the chiral partners into baryons and an $eta$ meson, such as $N(1535)rightarrow Neta$. Moreover, a strong coupling of $N(1535)$ to $N eta^prime $ emerges (this is important for studies of $eta^prime$ production processes). Our approach shows that $N(1535)$ is predominantly the chiral partner of $N(939)$, and $Lambda(1670)$ the chiral partner of $Lambda(1116)$. Finally, our formalism can be used to couple the pseudoscalar glueball $tilde{G}$ to baryons. We expect a large cross section for the reaction $bar{p}p rightarrow tilde{G} rightarrow bar{p}p(1535)$, which can be experimentally tested in the future PANDA experiment." @default.
- W2744034354 created "2017-08-17" @default.
- W2744034354 creator A5027705818 @default.
- W2744034354 creator A5034665552 @default.
- W2744034354 creator A5051693459 @default.
- W2744034354 creator A5084366819 @default.
- W2744034354 date "2018-01-18" @default.
- W2744034354 modified "2023-09-23" @default.
- W2744034354 title "Influence of the axial anomaly on the decay <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mi>N</mml:mi><mml:mo stretchy=false>(</mml:mo><mml:mn>1535</mml:mn><mml:mo stretchy=false>)</mml:mo><mml:mo stretchy=false>→</mml:mo><mml:mi>N</mml:mi><mml:mi>η</mml:mi></mml:mrow></mml:math>" @default.
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- W2744034354 doi "https://doi.org/10.1103/physrevd.97.014007" @default.
- W2744034354 hasPublicationYear "2018" @default.
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