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arXiv · hep-lat/0309073

Hadronic decays from the lattice

UKQCD Collaboration·C. Michael·C. McNeile
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Abstract

We discuss strategies to determine hadronic decay couplings from lattice studies. As an application, we explore the decay of a vector meson to two pseudoscalar mesons with $N_f=2$ flavours of sea quark. Although we are working with quark masses that do not allow a physical decay, we show how the transition rate can be evaluated from the amplitude for $ρ\to ππ$ and from the annihilation component of $ππ\to ππ$. We explore the decay amplitude for two different pion momenta and find consistent results. The coupling strength we find is in agreement with experiment. We also find evidence for a shift in the $ρ$ mass caused by mixing with two pion states.

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UKQCD Collaboration, C. Michael, C. McNeile. 2003-09-15. Hadronic decays from the lattice. https://doi.org/10.1016/s0920-5632(03)02534-9

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