2013/11/15 by T. Janowski, Janowski, T., Christopher Sachrajda +15
Medicine · Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Lattice (hep-lat) #Medical Imaging Techniques and Applications #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions
paper · doi:10.48550/arxiv.1311.3844
openalex publication_date 2013/11/15 · openalex created_date 2020/02/07 · openalex updated_date 2026/07/28
We review the status of recent calculations by the RBC-UKQCD collaboration of the complex amplitude A2, corresponding to the decay of a kaon to a two pion state with total isospin 2. In particular, we present preliminary results from two new ensembles: 483 × 96 with a-1=1.73 GeV and 643 × 128 with a-1=2.3 GeV, both at physical kinematics. Both ensembles were generated Iwasaki gauge action and domain wall fermion action with 2+1 flavours. These results, in comparison to our earlier ones on a 323 DSDR lattice with a-1=1.36 GeV, enable us to significantly reduce the discretization errors. The partial cancellation between the two dominant contractions contributing to Re(A2) has been confirmed and we believe that this cancellation is a major contribution to the ΔI=1/2 rule.