$B_K$ from twisted mass QCD

Details $B_K$ from twisted mass QCD $B_K$ from twisted mass QCD

2003-09-19

arxiv.org/abs/hep-lat/0309134v1

Physics

High Energy Physics

High Energy Physics - Lattice

Lattice2003(matrix), 3 pages, 2 figures

Scientific paper

10.1016/S0920-5632(03)02565-9

We present some preliminary results for $B_K$ at $\beta=6.0$, using the twisted mass QCD formalism for the computation of bare matrix elements of the $\Delta S=2$ 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 Schr\"odinger functional (SF) framework, using earlier results of our collaboration for the corresponding step scaling function.

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