Hadronic decays from the lattice

Collaboration, UKQCD, Michael, C and McNeile, C
(2003) Hadronic decays from the lattice. Nucl.Phys.Proc.Suppl., 129. pp. 215-217.

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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 $\rho \to \pi \pi$ 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
Additional Information: Proc. Latt03 (spectrum), 3 pages, 4 figs
Uncontrolled Keywords: hep-lat, hep-lat
Subjects: ?? QC ??
Divisions: Faculty of Science and Engineering > School of Physical Sciences > Mathematical Sciences
Depositing User: Symplectic Admin
Date Deposited: 20 Nov 2008 11:23
Last Modified: 17 Dec 2022 00:11
DOI: 10.1016/s0920-5632(03)02534-9
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/508