Delta I= 3/2, K to Pi Pi Decays with a Nearly Physical Pion Mass
EJ Goode, M Lightman - arXiv preprint arXiv:1101.2473, 2011 - arxiv.org
EJ Goode, M Lightman
arXiv preprint arXiv:1101.2473, 2011•arxiv.orgThe 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 …
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 …
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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