[Theory-seminars] Cake Seminar

[Raza Sufian]

Dear All, 

Here is a reminder of the cake seminar today:

Cake Seminar:
Wednesday, December 5th, 1:00PM, Room L102,
Luka Leskovec (Jlab), "A lattice QCD study of the $\rho$ meson"
BlueJeans link: https://bluejeans.com/195615763 <https://bluejeans.com/195615763>

Abstract: 
The $\rho$, perhaps the simplest hadronic resonance, offers plenty of interesting phenomena where new methods in lattice field theory can be tested and better understood. In this talk I will present results from our recent lattice QCD studies with $N_f=2+1$ clover fermions at a pion mass of approximately 320 MeV and lattice size 3.6 fm. I will discuss two processes involving the $\rho$: the first is by now the already well studied elastic scattering of two pions in P-wave with isospin 1, where the $\rho$ appears as a resonance. By analyzing the spectrum with the Luescher method we determine the strong decay width $\rho$→ $\pi\pi$. The second process is the radiative transition $\pi \gamma$ → $\pi\pi$ where we use the Briceno-Hansen-Walker-Loud approach to determine the transition amplitude in the invariant mass region near the $\rho$ resonance for both space- and time-like photon momentum. By analytic continuation to the $\rho$ pole we are able to determine also the $\rho$ radiative decay width, $\rho$→ $\pi\gamma$.

Thank you.

Carlota, Vincent & Raza
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