352 research outputs found
Hadronic decays from the lattice
I review the lattice QCD approach to determining hadronic decay transitions.
Examples considered include rho to pi pi; b_1 to pi omega; hybrid meson decays
and scalar meson decays. I discuss what lattices can provide to help understand
the composition of hadrons.Comment: 6 pages, presented at QNP06, June 200
Hadronic decays from the lattice
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 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 and
from the annihilation component of . 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 mass caused by mixing with two pion states.Comment: Proc. Latt03 (spectrum), 3 pages, 4 fig
Hadronic transitions from the lattice
I discuss strategies to determine hadronic decay couplings from lattice
studies.
As a check of the methods, I explore the decay of a vector meson to two
pseudoscalar mesons with flavours of sea quark. Although we are working
with quark masses that do not allow a physical decay, I show how the transition
rate can be evaluated from the amplitude for and from the
annihilation component of . I explore the decay amplitude
for two different pion momenta and find consistent results. The coupling
strength found is in agreement with experiment. I also find evidence for a
shift in the mass caused by mixing with two pion states.
I also present results for the decay of a hybrid meson, for the case of heavy
valence quarks.Comment: 10 pages, 7 ps figures, proc LHP03, Cairn
Hadronic decay of a vector meson from the lattice
We explore the decay of a vector meson to two pseudoscalar mesons on the
lattice with 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 and from the
annihilation component of . 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 mass caused by mixing with two pion states.Comment: 13 pages, version as accepted for Physics Letters
Beyond the quark model of hadrons from lattice QCD
Lattice QCD can give direct information on OZI-violating contributions to
mesons. Here we explore the contributions that split flavour singlet and
non-singlet meson masses. I discuss in detail the spectrum and decays for
scalar mesons (ie including glueball effects). I also review the status of
hybrid mesons and their decays.Comment: to appear in proceedings of QNP2002, 3 pages, LATEX, 2 ps figure
The omega-rho meson mass splitting and mixing from lattice QCD
We compare flavour singlet and non-singlet vector mesons from first
principles using lattice QCD. With N_f=2 flavours of light quark, this
addresses the omega-rho mass difference.
Using maximally twisted-mass lattice QCD, we are able for the first time to
determine this mass difference precisely and we compare with experiment. We
also discuss omega-rho mixing effects arising within QCD through the u-d quark
mass difference.Comment: 12 pages 4 figure
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