Jul 22 – 28, 2018
Kellogg Hotel and Conference Center
EST timezone

Calculating the $\rho$ radiative decay width with lattice QCD

Jul 25, 2018, 3:20 PM
105 (Kellogg Hotel and Conference Center)


Kellogg Hotel and Conference Center

219 S Harrison Rd, East Lansing, MI 48824
Parallel Hadron Spectroscopy and Interactions Hadron Spectroscopy and Interactions


Dr Luka Leskovec (University of Arizona)


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)


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)

Presentation materials