Delta I = 3/2, K to Pi Pi Decays with a Nearly Physical Pion Mass

Details Delta I = 3/2, K to Pi Pi Decays with a Nearly Physical Pion Mass Delta I = 3/2, K to Pi Pi Decays with a Nearly Physical Pion Mass

2011-01-13

arxiv.org/abs/1101.2473v1

PoS Lattice2010:313,2010

Physics

High Energy Physics

High Energy Physics - Lattice

7 pages, 2 figures, 3 tables, Talk presented at The XXVIII International Symposium on Lattice Field Theory, June 14 - 19 2010,

Scientific paper

The Delta I = 3/2 K to Pi Pi decay amplitude is calculated on RBC/UKQCD 32^3 x 64, L_s=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 (m_pi=141.9(2.3) MeV, partially quenched) and kaon mass (m_K=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(A_2)=1.396(081)_stat(160)_sys x 10^(-8) GeV and Im(A_2) = -8.46(45)_stat(1.95)_sys x 10^(-13) GeV.

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