The B and B_s Meson Decay Constants from Lattice QCD
| Autor: | Na, Heechang, Monahan, Chris J., Davies, Christine T. H., Horgan, Ron, Lepage, G. Peter, Shigemitsu, Junko |
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| Rok vydání: | 2012 |
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| Zdroj: | Phys. Rev. D 86 (2012) 034506 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevD.86.034506 |
| Popis: | We present a new determination of the B and B_s meson decay constants using NRQCD b-quarks, HISQ light and strange valence quarks and the MILC collaboration N_f=2+1 lattices. The new calculations improve on HPQCD's earlier work with NRQCD b-quarks by replacing AsqTad with HISQ valence quarks, by including a more chiral MILC fine ensemble in the analysis, and by employing better tuned quark masses and overall scale. We find f_B = 0.191(9)GeV, f_{B_s} = 0.228(10)GeV and f_{B_s}/f_B = 1.188(18). Combining the new value for f_{B_s}/f_B with a recent very precise determination of the B_s meson decay constant based on HISQ b-quarks, f_{B_s} = 0.225(4)GeV, leads to f_B = 0.189(4)GeV. With errors of just 2.1% this represents the most precise f_B available today. Comment: 12 pages with 14 figures. Version to appear in Physical Review D. Final result for f_{B_s} using NRQCD b-quarks updated to f_{B_s} = 0.228(10) GeV. Other results unchanged. Eq.(31) slightly modified and improved. References added |
| Databáze: | arXiv |
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