# Comment on 'Two-photon decay width of the sigma meson'

@article{Beveren2009CommentO,
title={Comment on 'Two-photon decay width of the sigma meson'},
author={Eef van Beveren and Frieder Kleefeld and George Erik Rupp and Michael D. Scadron},
journal={Physical Review D},
year={2009},
volume={79},
pages={098501}
}
• Published 16 November 2008
• Physics
• Physical Review D
We comment on a recent paper by Giacosa, Gutsche, and Lyobovitskij [Phys. Rev. D 77, 034007 (2008)], in which it is argued that a quarkonium interpretation of the $\ensuremath{\sigma}$ meson should give rise to a much smaller two-photon decay width than commonly assumed. The reason for this claimed discrepancy is a term in the transition amplitude, necessary for gauge invariance, which allegedly is often omitted in the literature, including the work of the present authors. Here we show their…
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## References

SHOWING 1-10 OF 31 REFERENCES
Two-photon decay width of the sigma meson
• Physics
• 2008
We shortly report on the two-photon decay width of the light $\ensuremath{\sigma}$-meson interpreted as a quarkonium state. Results are given in dependence on the $\ensuremath{\sigma}$-mass and the
Sigma coupling to photons: hidden scalar in gammagamma --> pi0pi0.
It is shown here that the sigma is already crouching in this cross section exactly as measured 20 years ago, and its two photon width is found to be far too large for a wholly gluonic, or even a tetraquark, state.
DYNAMICAL GENERATION OF THE GAUGED SU(2) LINEAR SIGMA MODEL
• Physics
• 1993
The fermion and meson sectors of the quark-level SU(2) linear sigma model are dynamically generated from a meson–quark Lagrangian, with the quark (q) and meson (σ, π) fields all treated as
Remarks on the f_0(400-1200) scalar meson as the dynamically generated chiral partner of the pion
• Physics
• 2002
The quark-level linear σ model (LσM) is revisited, in particular concerning the identification of the f0(400–1200) (or σ(600)) scalar meson as the chiral partner of the pion. We demonstrate the
Comments on compositeness in the SU(2) linear σ model
First we summarize the quark-level linear $\sigma$ model compositeness conditions and verify that indeed $m_\sigma = 2 m_q$ when $m_\pi = 0$ and $N_c=3$, rather than in the $N_c\to\infty$ limit, as
Identifying the quark content of the isoscalar scalar mesons f 0 (980), f 0 (1370), and f 0 (1500) from weak and electromagnetic processes
• Physics
• 2002
The assignments of the isoscalar scalar mesons f0(980), f0(1370), and f0(1500) in terms of their qqbar substructure is still a matter of heated dispute. Here we employ the weak and electromagnetic
Dynamical Model of Elementary Particles Based on an Analogy with Superconductivity. II
• Physics
• 1961
It is suggested that the nucleon mass arises largely as a self-energy of some primary fermion field through the same mechanism as the appearance of energy gap in the theory of superconductivity. The
WHY IS THE δ(983)→2γ WIDTH SO SMALL?
• Physics
• 1994
The δ0(983)→2γ decay width is calculated in a linear σ-model framework, in which both quark and meson loops contribute to the decay amplitude, and compared to the experimental decay width. The result