Neutral B Meson Mixing in Unquenched Lattice QCD
By E. G'amiz, C. Davies, G. Peter Lepage, J. Shigemitsu, M. Wingate. 2009
171 citations recorded by the source corpus.
We study B{sub d} and B{sub s} mixing in unquenched lattice QCD employing the MILC Collaboration gauge configurations that include u, d, and s sea quarks based on the improved staggered quark (AsqTad) action and a highly improved gluon action. We implement the valence light quarks also with the AsqTad action and use the nonrelativistic NRQCD action for the valence b quark. We calculate hadronic matrix elements necessary for extracting Cabibbo-Kobayashi-Maskawa matrix elements from experimental measurements of mass differences {delta}M{sub d} and {delta}M{sub s}. We find {xi}{identical_to}f{sub B{sub s}}{radical}(B-circumflex{sub B{sub s}})/f{sub B{sub d}}{radical}(B-circumflex{sub B{sub d}})=1.258(33), f{sub B{sub d}}{radical}(B-circumflex{sub B{sub d}})=216(15) MeV, and f{sub B{sub s}}{radical}(B-circumflex{sub B{sub s}})=266(18) MeV. We also update previous results for decay constants and obtain f{sub B{sub d}}=190(13) MeV, f{sub B{sub s}}=231(15) MeV, and f{sub B{sub s}}/f{sub B{sub d}}=1.226(26). The new lattice results lead to updated values for the ratio of Cabibbo-Kobayashi-Maskawa matrix elements |V{sub td}|/|V{sub ts}| and for the standard model prediction for Br(B{sub s}{yields}{mu}{sup +}{mu}{sup -}) with reduced errors. We determine |V{sub td}|/|V{sub ts}|=0.214(1)(5) and Br(B{sub s}{yields}{mu}{sup +}{mu}{sup -})=3.19(19)x10{sup -9}.
Subfields: Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/c9fcc5a533f09d6aa559b9720822f14dc1622fcb
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In Nuclear and High Energy Physics
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Citations in the corpus
- Implications of LHCb measurements and future prospects - eScholarship (2013, methodology): “As of the year 2009 there were two unquenched lattice QCD calculations of fBs , by the HPQCD [106] and FNAL/MILC [107] collaborations, which, when averaged, gave the value fBs = 238.”
- Charged-Higgs phenomenology in the aligned two-Higgs-doublet model (2010, unknown): “032)GeV [56]”
- Review of lattice results concerning low-energy particle physics (2016, methodology): “(168) and (169) are averages from HPQCD 09 [59] and RBC/UKQCD 14A [54], while Eq.”
- Focus Point Supersymmetry Redux (2011, result): “19) × 10−9 [37, 38], consistent with the LHC bounds and marginally inconsistent with the CDF analysis.”