Speaker
Dr
Luka Leskovec
(University of Arizona)
Description
We present the results of our lattice QCD study of the $\pi\gamma\to\pi\pi$ process, where the $\rho$ resonance appears as an enhancement in the transition amplitude. We use Nf=2+1 clover fermions on a lattice of L=3.6 fm and a pion mass of 320 MeV. Using a combination of forward, stochastic and sequential propagators we calculate the two-point and three-point functions required in the determination of the $\pi\gamma\to\pi\pi$ amplitude and determine the $\pi\gamma\to\pi\pi$ matrix elements in a region of invariant mass s and momentum transfer $q^2$. To fit the $q^2$ and s dependence of the amplitude we are exploring a set of general models based on a Taylor expansion and their description of the data. By analytic continuation to the complex pole corresponding to the $\rho$ resonance we determine the resonant form factors and calculate the radiative decay width of the $\rho$ resonance.
Primary author
Dr
Luka Leskovec
(University of Arizona)
Co-authors
Andrew Pochinsky
(MIT)
Prof.
Constantia Alexandrou
(Cyprus University)
Mr
Jesus Gumaro Rendon Suzuki
(University of Arizona)
Prof.
John Negele Negele
(MIT)
Dr
Marcus Petschlies
(University Bonn)
Mr
SRIJIT PAUL
(The Cyprus Institute)
Prof.
Sergey Syritsyn
(Stony Brook University (SUNY))
Stefan Meinel
(University of Arizona)