The Neutral kaon mixing parameter B(K) from unquenched mixed-action lattice QCD
We calculate the neutral kaon mixing parameter B_K in unquenched lattice QCD using asqtad-improved staggered sea quarks and domain-wall valence quarks. We use the "2+1" flavor gauge configurations generated by the MILC Collaboration, and simulate with multiple valence and sea quark masses at two lattice spacings of a ~ 0.12 fm and a ~ 0.09 fm. We match the lattice determination of B_K to the continuum value using the nonperturbative method of Rome-Southampton, and extrapolate B_K to the continuum and physical quark masses using mixed action chiral perturbation theory. The "mixed-action" method enables us to control all sources of systematic uncertainty and therefore to precisely determine B_K; we find a value of B_K^{MSbar, NDR}(2 GeV) = 0.527(6)(20), where the first error is statistical and the second is systematic.
- Research Organization:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- AC05-06OR23177
- OSTI ID:
- 1003861
- Report Number(s):
- JLAB-THY-10-1117; DOE/OR/23177-1410; arXiv:0905.3947; PRVDAQ; TRN: US1100530
- Journal Information:
- Phys.Rev.D, Vol. 81, Issue 01; ISSN 1550-7998
- Country of Publication:
- United States
- Language:
- English
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Neutral Kaon Mixing Parameter BK from Unquenched Mixed-action Lattice
The Neutral kaon mixing parameter B(K) from unquenched mixed-action lattice QCD