Hadronic decays from the lattice

✍ Scribed by C. Michaela; C. McNeilea

• Publisher: Elsevier Science
• Year: 2004
• Tongue: English
• Weight: 276 KB
• Volume: 129-130
• Category: Article
• ISSN: 0920-5632
• DOI: 10.1016/s0920-5632(03)02534-9

✦ Synopsis

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 Nf = 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 p 7' 7r7r and from the annihilation component of 7rr --f nr. 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 p mass caused by mixing with two pion states.