Beyond the Standard Model corrections to $K^0-{\bar{K}}^0$ mixing

Abstract

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 N_f = 2+1 flavors. We use three different lattice spacings (a ~ 0.045, 0.06 and 0.09 fm) at a fixed ratio of light to strange quarks, m_l/m_s = 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-bar scheme. For the chiral and continuum extrapolations, we use SU(2) staggered chiral perturbation theory. We present preliminary results with only statistical errors.

7 pages, 4 figures, Contribution to proceedings of 30th International Symposium on Lattice Field Theory (Lattice 2012), June 24-29, 2012; Cairns, Australia

References in corpus (5)

• Continuum Limit of $B_K$ from 2+1 Flavor Domain Wall QCD
• $B_K$ using HYP-smeared staggered fermions in $N_f=2+1$ unquenched QCD
• Neutral kaon mixing beyond the standard model with nf=2+1 chiral fermions
• One-loop matching of improved four-fermion staggered operators with an improved gluon action
• Chiral extrapolation of matrix elements of BSM kaon operators

Cited by in corpus (2)

• Chiral extrapolation of matrix elements of BSM kaon operators
• Recent progress in staggered chiral perturbation theory