Neutral B-Meson Mixing Parameters in and beyond the SM with 2+1 Flavor Lattice QCD
- William-Mary Coll.
- Art Inst. of Chicago
- Washington U., St. Louis
- Illinois U., Urbana
- Granada U., Theor. Phys. Astrophys.
- Munich, Tech. U.
- Syracuse U.
- Fermilab
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 $$N_f=2+1$$ dynamical flavors at four different lattice spacings in the range $$a \approx 0.045$$--$0.12$~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 wrong-spin 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.
- Research Organization:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- Contributing Organization:
- Fermilab Lattice; MILC
- DOE Contract Number:
- AC02-07CH11359
- OSTI ID:
- 1327023
- Report Number(s):
- FERMILAB-CONF-14-520-T; arXiv:1412.5097; 1334532
- Journal Information:
- PoS, Vol. LATTICE2014; Conference: 32nd International Symposium on Lattice Field Theory, Brookhaven, NY, USA, 06/23-06/28/2014
- Country of Publication:
- United States
- Language:
- English
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