All Outputs (5)

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.

Towards a model-independent determination of the φ -> γ f₀ coupling (2003)
Journal Article
Boglione, M., & Pennington, M. (2003). Towards a model-independent determination of the φ -> γ f₀ coupling. The European Physical Journal C, 30(4), 503-512. https://doi.org/10.1140/epjc/s2003-01284-3

A guide to the composition of the enigmatic f0(980) and a0(980) states is their formation in φ-radiative decays. Precision data are becoming available from the KLOE experiment at the DAΦNE machine at Frascati, as well as results from SND and CMD-2 at... Read More about Towards a model-independent determination of the φ -> γ f₀ coupling.

Dynamical generation of scalar mesons (2002)
Journal Article
Boglione, M., & Pennington, M. (2002). Dynamical generation of scalar mesons. Physical Review D, Particles and fields, 65, https://doi.org/10.1103/physrevd.65.114010

Starting with just one bare seed for each member of a scalar nonet, we investigate when it is possible to generate more than one hadronic state for each set of quantum numbers. In the framework of a simple model, we find that in the I=1 sector it is... Read More about Dynamical generation of scalar mesons.

Probing the structure of f0(980) through radiative /phi decays (2001)
Journal Article
De Fazio, F., & Pennington, M. (2001). Probing the structure of f0(980) through radiative /phi decays. Physics Letters B, 521(1-2), 15-21. https://doi.org/10.1016/s0370-2693%2801%2901200-x

We consider the radiative transition φ→f0γ, which is a sensitive probe of the nature of the f0(980) particle. Using the QCD sum-rule technique, we estimate the branching ratio of such decay mode to be: , in fair agreement with present experimental da... Read More about Probing the structure of f0(980) through radiative /phi decays.

There is no /κ(900) (2001)
Journal Article
Cherry, S., & Pennington, M. (2001). There is no /κ(900). Nuclear Physics A, 688(3-4), 823-841. https://doi.org/10.1016/s0375-9474%2800%2900587-x

In the I=0 sector there are more scalar mesons than can fit in one nonet. Consequently, many have claimed that there is in fact more than one multiplet, perhaps both and . Such proposals require the existence of at least two strange isodoublets (and... Read More about There is no /κ(900).