Sigma coupling to photons: hidden scalar in gamma gamma $\to$ pi0 pi0
(2006)
Journal Article
Pennington, M. (2006). Sigma coupling to photons: hidden scalar in gamma gamma $\to$ pi0 pi0. Physical Review Letters, 97(1), https://doi.org/10.1103/physrevlett.97.011601
There has long been speculation about the nature of the resonance. For three decades Jaffe has argued for a tetraquark composition, while others have claimed it is largely a glueball. A key pointer to its nature is its coupling to two photons. Conseq... Read More about Sigma coupling to photons: hidden scalar in gamma gamma $\to$ pi0 pi0.