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2013

Lattice QCD and the two-photon decay of the neutral pion

Meyer, Harvey B.

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Two-photon decays probe the structure of mesons and represent an important contribution to hadronic light-by-light scattering.

For the neutral pion, the decay amplitude tests the effects of the chiral anomaly; for a heavy quarkonium state, it measures the magnitude of its wavefunction at the origin.
We rederive the expression of the decay amplitude in terms of a Euclidean correlation function starting from the theory defined on the torus.
The derivation shows that for timelike photons the approach to the infinite-volume decay amplitude is exponential in the periodic box size.

Lattice QCD and the two-photon decay of the neutral pion · Around

Built on

R. Hofstadter and R. W. McAllister,
1955
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