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30 papers · 2 filters
Pseudoscalar decay constants, light-quark masses, and B_K from mixed-action lattice QCD
Jack Laiho, Ruth S. Van de Water
We present updated results for the leptonic decay constants f_pi and f_K, the light u, d, and s-quark masses, and the neutral kaon mixing parameter B_K from mixed-action lattice si…
B and D meson decay constants from 2+1 flavor improved staggered simulations
E. T. Neil, Jon A. Bailey, A. Bazavov +21
We give an update on simulation results for the decay constants f_B, f_{B_s}, f_D and f_{D_s}. These decay constants are important for precision tests of the standard model, in par…
B- and D-meson decay constants from three-flavor lattice QCD
A. Bazavov, C. Bernard, C. M. Bouchard +20
We calculate the leptonic decay constants of B_{(s)} and D_{(s)} mesons in lattice QCD using staggered light quarks and Fermilab bottom and charm quarks. We compute the heavy-light…
Fisher's zeros, complex RG flows and confinement in LGT models
Alan Denbleyker, Alexei Bazavov, Daping Du +3
The zeros of the partition function in the complex beta plane (Fisher's zeros) play an important role in our understanding of phase transitions and RG flows. Recently, we argued th…
Looking for Restoration in Hot QCD with Domain Wall Fermions
Prasad Hegde
The effects of the axial anomaly are suppressed at high temperatures due to screening effects in the quark-gluon plasma. If the suppression is nearly complete close to the chiral t…
B Mixing in the Standard Model and Beyond: Lattice QCD
C. Bernard, C. M. Bouchard, A. X. El-Khadra +5
We give a brief overview and progress report on our lattice QCD calculation of neutral B mixing hadronic matrix elements needed for Standard Model and Beyond the Standard Model phy…
The Decay Amplitude from Lattice QCD
T. Blum, P. A. Boyle, N. H. Christ +13
We report on the first realistic \emph{ab initio} calculation of a hadronic weak decay, that of the amplitude for a kaon to decay into two π-mesons with isospin 2. We find Re…
The Infrared behavior of SU(3) Nf=12 gauge theory -about the existence of conformal fixed point-
Kenji Ogawa, Tatsumi Aoyama, Hiroaki Ikeda +8
Incorporated with twisted boundary condition, Polyakov loop correlators can give a definition of the renormalized coupling. We employ this scheme for the step scaling method (with…
Semileptonic B to D decays at nonzero recoil with 2+1 flavors of improved staggered quarks
Si-Wei Qiu, Carleton DeTar, Daping Du +3
The Fermilab Lattice-MILC collaboration is completing a comprehensive program of heavy-light physics on the MILC (2+1)-flavor asqtad ensembles with lattice spacings as small as 0.0…
Kaon -parameter from improved staggered fermions in QCD
Taegil Bae, Yong-Chull Jang, Chulwoo Jung +9
We present a calculation of the kaon -parameter, , using lattice QCD. We use improved staggered valence and sea fermions, the latter generated by the MILC collaboration wit…
Possible lattice approach to B to D pi (K) matrix elements
C. Aubin, C. -J. David Lin, Amarjit Soni
We present an approach for computing the real parts of the nonleptonic B to DP and B to D-bar P (P=K,pi) decay amplitudes by using lattice QCD methods. While it remains very challe…
The chiral and deconfinement aspects of the QCD transition
A. Bazavov, T. Bhattacharya, M. Cheng +18
We present results on the chiral and deconfinement properties of the QCD transition at finite temperature. Calculations are performed with 2+1 flavors of quarks using the p4, asqta…
Interquark potential for the charmonium system with almost physical quark masses
Taichi Kawanai, Shoichi Sasaki
We study an interquark QQ^bar potential for the charmonium system, that is determined from the the equal-time and Coulomb gauge QQ^bar Bethe-Salpeter (BS) wavefunction through the…
Fluctuations and Higher Moments of Conserved Charges from the Lattice
Prasad Hegde
We present results for the lowest-order non-vanishing quark number susceptibilities. These were calculated using an improved action viz. the HISQ action, which controls taste viola…
Index Theorem and Overlap Formalism with Naive and Minimally Doubled Fermions
Taro Kimura, Michael Creutz, Tatsuhiro Misumi
We present a theoretical foundation for the index theorem in naive and minimally doubled lattice fermions by studying the spectral flow of a Hermitean version of Dirac operators. W…
Aoki Phases in Staggered-Wilson Fermions
Tatsuhiro Misumi, Michael Creutz, Taro Kimura +2
We investigate the parity-broken phase (Aoki phase) for staggered-Wilson fermions by using the Gross-Neveu model and the strong-coupling lattice QCD. In the both cases the gap equa…
Charmonium potential from full lattice QCD
Taichi Kawanai, Shoichi Sasaki
We present both spin-independent and -dependent parts of a central interquark potential for charmonium states, which is calculated in 2+1 flavor dynamical lattice QCD using the PAC…
Moments of charge fluctuations, pseudo-critical temperatures and freeze-out in heavy ion collisions
Frithjof Karsch
We discuss universal properties of higher order cumulants of net baryon number fluctuations and point out their relevance for the analysis of freeze-out and critical conditions in…
to Decay amplitudes from Lattice QCD
T. Blum, P. A. Boyle, N. H. Christ +11
We report a direct lattice calculation of the to decay matrix elements for both the and 3/2 amplitudes and on 2+1 flavor, domain wall fermion, $16^3\t…
The scaling functions of the free energy density and its derivatives for the 3d O(4) model
Juergen Engels, Frithjof Karsch
We derive direct representations of the scaling functions of the 3d O(4) model which are relevant for comparisons to other models, in particular QCD. This is done in terms of expan…
Charm quark system at the physical point of 2+1 flavor lattice QCD
Y. Namekawa, S. Aoki, K. -I. Ishikawa +9
We investigate the charm quark system using the relativistic heavy quark action on 2+1 flavor PACS-CS configurations previously generated on lattice. The dynamical…
Charmonium spectral functions with the variational method in zero and finite temperature lattice QCD
H. Ohno, S. Aoki, S. Ejiri +4
We propose a method to evaluate spectral functions on the lattice based on a variational method. On a lattice with a finite spatial extent, spectral functions consist of discrete s…
Nucleon structure from 2+1 flavor domain wall QCD at nearly physical pion mass
Shigemi Ohta
The RBC and UKQCD collaborations have been investigating hadron physics in numerical lattice quantum chromodynamics (QCD) with (2+1) flavors of dynamical domain wall fermions (DWF)…
Continuum extrapolation of finite temperature meson correlation functions in quenched lattice QCD
Anthony Francis, Frithjof Karsch
We explore the continuum limit of meson correlation functions at finite temperature. In detail we analyze finite volume and lattice cut-off effects in view of poss…