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$B_K$ from twisted mass QCD

arXiv:hep-lat/0309134 · doi:10.1016/S0920-5632(03)02565-9

Abstract

We present some preliminary results for $B_K$ at $β=6.0$, using the twisted mass QCD formalism for the computation of bare matrix elements of the $ΔS=2$ operator. The main advantage of the method is that mixing with other $d=6$ operators under renormalisation is avoided. Moreover the operator renormalisation is performed in the Schrödinger functional (SF) framework, using earlier results of our collaboration for the corresponding step scaling function.

Lattice2003(matrix), 3 pages, 2 figures