We calculate the B-parameters for operators arising in theories of new physics beyond the standard model (BSM) using HYP-smeared improved staggered fermions on the MILC asqtad lattices with Nf =2+1 flavors. We use three different lattice spacings (a0:045; 0:06 and 0:09 fm) at a fixed ratio of light to strange quarks, m=ms = 1=5, to obtain the continuum results. Operator matching is done using perturbative matching at one-loop order, and results are run to 2 or 3 GeV using two-loop running in the MS scheme. For the chiral and continuum extrapolations, we use SU(2) staggered chiral perturbation theory. We present preliminary results with only statistical errors.
|Journal||Proceedings of Science|
|Publication status||Published - 2012|
|Event||30th International Symposium on Lattice Field Theory, Lattice 2012 - Cairns, Australia|
Duration: 2012 Jun 24 → 2012 Jun 29
Bibliographical noteFunding Information:
We thank Claude Bernard for private communications regarding the parameters of the MILC ensembles. C. Jung is supported by the US DOE under contract DE-AC02-98CH10886. W. Lee is supported by the Creative Research Initiatives Program (2012-0000241) of the NRF grant funded by the Korean government (MEST), and acknowledges support from KISTI supercomputing center through the strategic support program for the supercomputing application research [No. KSC-2011-G2-06]. S. Sharpe is supported in part by the US DOE grant no. DE-FG02-96ER40956. Computations were carried out in part on QCDOC computing facilities of the USQCD Collaboration at Brookhaven National Lab, on GPU computing facilities at Jefferson Lab, on the DAVID GPU clusters at Seoul National University, and on the KISTI supercomputers. The USQCD Collaboration are funded by the Office of Science of the U.S. Department of Energy.
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