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- C Aubin, C Bernard, C Detar, J Osborn, Steven Gottlieb, E B Gregory +4 others
- 2004

1 Abstract As part of our program of lattice simulations of three flavor QCD with improved staggered quarks, we have calculated pseudoscalar meson masses and decay constants for a range of valence quark masses and sea quark masses on lattices with lattice spacings of about 0.125 fm and 0.09 fm. We fit the lattice data to forms computed with " staggered… (More)

- C Aubin, C Bernard, C Detar, M Dipierro, A El-Khadra, Steven Gottlieb +14 others
- Physical review letters
- 2005

We present the first three-flavor lattice QCD calculations for D-->pilnu and D-->Klnu semileptonic decays. Simulations are carried out using ensembles of unquenched gauge fields generated by the MILC Collaboration. With an improved staggered action for light quarks, we are able to simulate at light quark masses down to 1/8 of the strange mass. Consequently,… (More)

- C T H Davies, E Follana, A Gray, G P Lepage, Q Mason, M Nobes +20 others
- Physical review letters
- 2004

The recently developed Symanzik-improved staggered-quark discretization allows unquenched lattice-QCD simulations with much smaller (and more realistic) quark masses than previously possible. To test this formalism, we compare experiment with a variety of nonperturbative calculations in QCD drawn from a restricted set of "gold-plated" quantities. We find… (More)

- C Aubin, C Bernard
- 2008

We show how to compute chiral logarithms that take into account both the O(a 2) taste-symmetry breaking of staggered fermions and the fourth-root trick that produces one taste per flavor. The calculation starts from the Lee-Sharpe Lagrangian generalized to multiple flavors. An error in a previous treatment by one of us is explained and corrected. The one… (More)

- C Aubin, C Bernard, C Detar, M Di Pierro, E D Freeland, Steven Gottlieb +15 others
- Physical review letters
- 2005

We present the first lattice QCD calculation with realistic sea quark content of the D+-meson decay constant f(D+). We use the MILC Collaboration's publicly available ensembles of lattice gauge fields, which have a quark sea with two flavors (up and down) much lighter than a third (strange). We obtain f(D+)=201+/-3+/-17 MeV, where the errors are statistical… (More)

- C Aubin, C Bernard
- 2008

In a continuation of an ongoing program, we use staggered chiral perturbation theory to calculate the one-loop chiral logarithms and analytic terms in the pseudoscalar meson leptonic decay constants, f π + 5 and f K + 5. We consider the partially quenched, " full QCD " (with three dynamical flavors), and quenched cases.

- C Aubin, C Bernard
- 2006

We incorporate heavy-light mesons into staggered chiral perturbation theory (SPT), working to leading order in 1=m Q , where m Q is the heavy-quark mass. At first nontrivial order in the chiral expansion, staggered taste violations affect the chiral logarithms for heavy-light quantities only through the light-meson propagators in loops. There are also new… (More)

- C Aubin, C Bernard
- 2003

We discuss how to formulate a staggered chiral perturbation theory (S χ PT). This amounts to a generalization of the Lee-Sharpe Lagrangian to include more than one flavor (i.e., multiple staggered fields), which turns out to be nontrivial. One loop corrections to pion and kaon masses and decay constants are computed as examples in three cases: the quenched,… (More)

- C Aubin, C Bernard
- 2004

We merge heavy quark effective theory with staggered chiral perturbation theory to calculate heavy-light (B, D) meson quantities. We present results at NLO for the B(D) meson decay constant in the partially quenched and full QCD cases, and discuss the calculation of the form factors for B(D) → π(K)ℓν decays. The lattice can make a major contribution to the… (More)

- C Aubin, C Bernard
- 2007

We calculate the form factors for the semileptonic decays of heavy-light pseudoscalar mesons in partially quenched staggered chiral perturbation theory (SPT), working to leading order in 1=m Q , where m Q is the heavy-quark mass. We take the light meson in the final state to be a pseudoscalar corresponding to the exact chiral symmetry of staggered quarks.… (More)