Current status of ε_K calculated with lattice QCD inputs

2014/10/26 by Bailey, Jon A., Jang, Yong-Chull, Lee, Weonjong
#FOS: Physical sciences #High Energy Physics - Lattice (hep-lat) #High Energy Physics - Phenomenology (hep-ph)

paper · doi:10.48550/arxiv.1410.6995

Abstract

We present results for ε_K, the indirect CP violation parameter, calculated in the Standard Model using inputs from lattice QCD: the kaon bag parameter B_K, and the CKM matrix element V_cb from the axial current form factor for the exclusive decay B→ D^*ℓν at zero-recoil. In addition, we take the coordinates of the unitarity triangle apex (ρ,η) from the angle-only fit of the UTfit Collaboration and use V_us to fix λ. In order to estimate the systematic error, we also use Wolfenstein parameters from the CKMfitter and UTfit. We find a 3.3(2)σ difference between ε_K and experiment with exclusive V_cb. We report details of this preliminary result.

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