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From QCD to Physical Resonances

Event Details

Event Dates: 

Monday, September 28, 2015 - 4:00pm

Seminar Location: 

  • Duane Physics Room G125

Speaker Name(s): 

Daniel Bolton

Speaker Affiliation(s): 

University of Colorado
Seminar Type/Subject

Scientific Seminar Type: 

  • Nuclear/Particle Physics Seminar

Event Details & Abstract: 

As lattice QCD calculations continue to improve, scattering observables are becoming available. The Hadron Spectrum collaboration recently determined the pion-pion spectrum in the rho channel with quark masses that yield a 240 MeV pion. Using Luscher's method, this finite volume spectrum can be used to extract the infinite volume phase shift. The resonant behavior is clearly evident when the phase shift is fit to a Breit-Wigner. This is not the end of the story, though! Having performed the calculation at unphysically-large quark masses, connection with experimental results requires further analysis. We present our use of Unitarized Chiral Perturbation Theory to connect the Hadron Spectrum calculation with experimental results. We find that this chiral extrapolation does an excellent job reproducing experimental pion-pion scattering data.