Delta I = 3/2, K to Pi Pi Decays with a Nearly Physical Pion Mass
Abstract
The Delta I = 3/2 K to Pi Pi decay amplitude is calculated on RBC/UKQCD 323 x 64, Ls=32 dynamical lattices with 2+1 flavors of domain wall fermions using the DSDR and Iwasaki gauge action. The calculation is performed with a single pion mass (mpi=141.9(2.3) MeV, partially quenched) and kaon mass (mK=507.4(8.5) MeV) which are nearly physical, and with nearly energy conserving kinematics. Antiperiodic boundary conditions in two spatial directions are used to give the two pions non-zero ground state momentum. Results for time separations of 20, 24, 28 and 32 between the kaon and two-pion sources are computed and an error weighted average is performed to reduce the error. We find prelimenary results for Re(A2)=1.396(081)stat(160)sys x 10(-8) GeV and Im(A2) = -8.46(45)stat(1.95)sys x 10(-13) GeV.
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