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SUMMARY:Scattering and unstable hadrons in lattice QCD  - Christopher Thom
 as (University of Cambridge)
DTSTART:20141126T141500Z
DTEND:20141126T151500Z
UID:TALK56348@talks.cam.ac.uk
CONTACT:Mahdi Godazgar
DESCRIPTION:The majority of hadrons are unstable\; they decay strongly to 
 two or more lighter hadrons and appear as resonances\, complex singulariti
 es in hadron-hadron scattering amplitudes.  Moreover\, over the last decad
 e experiments have observed a number of puzzling states near or above thre
 sholds.  Lattice QCD provides a method to perform first-principles calcula
 tions of these phenomena that can be compared against experiment\, but stu
 dying resonances and scattering is challenging in a Euclidean field theory
 .  I will summarise how we have recently made some significant advances in
  this area by using a range of techniques and discuss a couple of applicat
 ions: the rho resonance in elastic pi pi scattering and coupled-channel st
 rangeness = 1 scattering (pi K\, eta K) where we found a variety of intere
 sting phenomena (narrow and broad resonances\, a bound state and a 'virtua
 l bound state').  I will comment on future prospects and further applicati
 ons. 
LOCATION:MR2\, Centre for Mathematical Sciences
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