BK from quenched overlap QCD

✍ Scribed by N. Carron; L. Giusti; C. Hoelbling; L. Lellouch; C. Rebbi

• Book ID: 104354322
• Publisher: Elsevier Science
• Year: 2003
• Tongue: English
• Weight: 124 KB
• Volume: 119
• Category: Article
• ISSN: 0920-5632
• DOI: 10.1016/s0920-5632(03)01550-0

✦ Synopsis

We present an exploratory calculation of the standard model AS = 2 matrix element relevant for indirect CP violation in K + KK decays. The computation is performed with overlap fermions in the quenched approximation at ,0 = 6.0 on a 163 x 32 lattice. We make use of left-handed currents to eliminate spurious zero-mode contributions.

The resulting bare matrix element is renormalized non-perturbatively. Our preliminary result is BEDR(2 GeV) = 0.61(7), where the error does not yet include an estimate of systematic uncertainties.