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- W1991249942 abstract "There has long been speculation about the nature of the $ensuremath{sigma}$ 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. Consequently, there have been recent proposals to observe this important scalar hiding in $ensuremath{gamma}ensuremath{gamma}ensuremath{rightarrow}{ensuremath{pi}}^{0}{ensuremath{pi}}^{0}$. We show here that the $ensuremath{sigma}$ is already crouching in this cross section exactly as measured 20 years ago. What is new is that precise knowledge of the position of the $ensuremath{sigma}$ pole, provided by the analysis of the Roy equations, now allows its two photon coupling to be accurately fixed. Its two photon width is found to be $(4.1ifmmodepmelsetextpmfi{}0.3)text{ }text{ }mathrm{keV}$, a value far too large for a wholly gluonic, or even a tetraquark, state." @default.
- W1991249942 created "2016-06-24" @default.
- W1991249942 creator A5087580790 @default.
- W1991249942 date "2006-07-06" @default.
- W1991249942 modified "2023-10-14" @default.
- W1991249942 title "Sigma Coupling to Photons: Hidden Scalar in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mi>γ</mml:mi><mml:mi>γ</mml:mi><mml:mo>→</mml:mo><mml:msup><mml:mi>π</mml:mi><mml:mn>0</mml:mn></mml:msup><mml:msup><mml:mi>π</mml:mi><mml:mn>0</mml:mn></mml:msup></mml:math>" @default.
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- W1991249942 doi "https://doi.org/10.1103/physrevlett.97.011601" @default.
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