Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2010-01-12
Physics
High Energy Physics
High Energy Physics - Lattice
60 pages, 9 figures
Scientific paper
We demonstrate a method for calculating the neutral B-meson decay constants and mixing matrix elements in unquenched lattice QCD with domain-wall light quarks and static b-quarks. Our computation is performed on the "2+1" flavor gauge configurations generated by the RBC and UKQCD Collaborations with a lattice spacing of a approx 0.11 fm (a^-1 = 1.729 GeV) and a lattice spatial volume of approximately (1.8 fm)^3. We simulate at three different light sea quark masses with pion masses down to approximately 430 MeV, and extrapolate to the physical quark masses using a phenomenologically-motivated fit function based on next-to-leading order heavy-light meson SU(2) chiral perturbation theory. For the b-quarks, we use an improved formulation of the Eichten-Hill action with static link-smearing to increase the signal-to-noise ratio. We also improve the heavy-light axial current used to compute the B-meson decay constant to O(alpha_s p a) using one-loop lattice perturbation theory. We present initial results for the SU(3)-breaking ratios f_{B_s}/f_{B_d} and xi = f_{B_s} sqrt{B_{B_s}}/f_{B_d} sqrt{B_{B_d}}, thereby demonstrating the viability of the method. For the ratio of decay constants, we find f_{B_s}/f_{B_d} = 1.15(12) and for the ratio of mixing matrix elements, we find xi = 1.13(12), where in both cases the errors reflect the combined statistical and systematic uncertainties, including an estimate of the size of neglected O(1/m_b) effects.
Albertus Conrado
Aoki Yasumichi
Boyle Peter A.
Christ Norman H.
de Water Ruth S. Van
No associations
LandOfFree
Neutral B-meson mixing from unquenched lattice QCD with domain-wall light quarks and static b-quarks does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Neutral B-meson mixing from unquenched lattice QCD with domain-wall light quarks and static b-quarks, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Neutral B-meson mixing from unquenched lattice QCD with domain-wall light quarks and static b-quarks will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-524023