Neutral $B$ mixing from 2+1 flavor lattice-QCD: the Standard Model and beyond

Details Neutral $B$ mixing from 2+1 flavor lattice-QCD: the Standard Model and beyond Neutral $B$ mixing from 2+1 flavor lattice-QCD: the Standard Model and beyond

2011-12-23

arxiv.org/abs/1112.5642v2

Physics

High Energy Physics

High Energy Physics - Lattice

13 pages, 6 figures. Proceedings of the XXIX International Symposium on Lattice Field Theory - Lattice 2011, July 10-16, 2011,

Scientific paper

We report on the status of our lattice-QCD calculation of the hadronic contribution to $B_d^0$ and $B^0_s$ mixing, with 2+1 flavors of dynamical sea quarks. Preliminary results for hadronic mixing matrix elements are given for a basis of five four-quark, dimension-six, $\Delta B=2$ mixing operators that spans the space of all possible hadronic mixing contributions in the Standard Model and beyond. At the intermediate stage of analysis reported on in this work, our errors are competitive with published Standard Model matrix element results. For beyond the Standard Model matrix elements, this is the first unquenched calculation and the first new lattice-QCD calculation in ten years.

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