Insights into Q2Qbar2 states from an effective perspective

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Title:	Insights into Q2Qbar2 states from an effective perspective
Author:	Ametller Congost, Lluís; Talavera Sánchez, Pedro
Other authors:	Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear; Universitat Politècnica de Catalunya. SIMCON - Grup de Recerca de Simulació per Ordinador en Matèria Condensada
Abstract:	We discuss the two-photon coupling of the lightest scalar meson on the basis of an extension of χPT. Using low-energy data on the pion form factor and the γγ→π+π−(π0π0) cross sections as inputs, we find Γ(σ→γγ)≅0.126 keV. The smallness of the result and the relative weight between its components, Γγγ→S1Γγγ→ππ→S1≤1, suggests that the scalar 0++ meson is mainly a Q2Q¯2 state.
Abstract:	Peer Reviewed
Subject(s):	-Àrees temàtiques de la UPC::Física -Photons -Quantum optics -Mesons -Scalar mesons -tetraquark -effective theories -Fotons -Òptica quàntica -Mesons
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Document type:	Article - Submitted version Article
Published by:	American Physical Society
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