Neutral B-meson mixing parameters in and beyond the SM with 2+1 flavor lattice QCD

Fermilab Lattice and MILC Collaborations

Research output: Contribution to journalArticle

Abstract

We report on the status of our calculation of the hadronic matrix elements for neutral B-meson mixing with asqtad sea and valence light quarks and using the Wilson clover action with the Fermilab interpretation for the b quark. We calculate the matrix elements of all five local operators that contribute to neutral B-meson mixing both in and beyond the Standard Model. We use MILC ensembles with Nf = 2 + 1 dynamical flavors at four different lattice spacings in the range a ≈ 0.045-0.12 fm, and with light sea-quark masses as low as 0.05 times the physical strange quark mass. We perform a combined chiral-continuum extrapolation including the so-called wrongspin contributions in simultaneous fits to the matrix elements of the five operators. We present a complete systematic error budget and conclude with an outlook for obtaining final results from this analysis.

Original languageEnglish (US)
Article number378
JournalProceedings of Science
VolumePart F130500
StatePublished - 2014

ASJC Scopus subject areas

  • General

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    Fermilab Lattice and MILC Collaborations (2014). Neutral B-meson mixing parameters in and beyond the SM with 2+1 flavor lattice QCD. Proceedings of Science, Part F130500, [378].