# Hadronic decay of a vector meson from the lattice

Collaboration, UKQCD, McNeile, C and Michael, C
Hadronic decay of a vector meson from the lattice. Phys.Lett.B, 556. 177 - 184.

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## Abstract

We explore the decay of a vector meson to two pseudoscalar mesons on the lattice 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 $\rho \to \pi \pi$ and from the annihilation component of $\pi \pi \to \pi \pi$. 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 $\rho$ mass caused by mixing with two pion states.

Item Type: Article 13 pages, version as accepted for Physics Letters B hep-lat, hep-lat Q Science > QC Physics ?? dep_math ?? Symplectic Admin 19 Aug 2008 13:22 16 Sep 2020 07:10 10.1016/S0370-2693(03)00130-8 http://livrepository.liverpool.ac.uk/id/eprint/529