Explanipedia

High-Precision Scale Setting with the Omega-Baryon Mass and Gradient Flow Open

Claude W. Bernard, A. X. El-Khadra, Urs M. Heller, Hwancheol Jeong, Andreas S. Kronfeld , et al. · 2025

The gradient-flow scale $w_0$ in lattice QCD is determined using the mass of the $Ω^-$ baryon to set the physical scale. Nine ensembles using the highly improved staggered quark (HISQ) action with lattice spacings of 0.15 fm down to 0.04 f…

Update on the gradient flow scale on the 2+1+1 HISQ ensembles Open

A. Bazavov, C. Bérnard, Carleton DeTar, A. X. El-Khadra, E. Gámiz , et al. · 2024

We report on the ongoing effort of improving the determination of the gradient flow scale on the (2+1+1)-flavor HISQ ensembles generated by the MILC collaboration. We compute the scales $\sqrt{t_0}/a$ and $w_0/a$ with the Wilson and Symanz…

Update on the gradient flow scale on the 2+1+1 HISQ ensembles Open

A. Bazavov, C. Bérnard, Carleton DeTar, A. X. El-Khadra, E. Gámiz , et al. · 2024

We report on the ongoing effort of improving the determination of the gradient flow scale on the (2+1+1)-flavor HISQ ensembles generated by the MILC collaboration. We compute the scales $\sqrt{t_0}/a$ and $w_0/a$ with the Wilson and Symanz…

Erratum to: Semileptonic form factors for $$B\rightarrow D^*\ell \nu $$ at nonzero recoil from $$2+1$$-flavor lattice QCD Open

A. Bazavov, Carleton DeTar, D. Du, A. X. El-Khadra, E. Gámiz , et al. · 2023

Semileptonic form factors for $$B\rightarrow D^*\ell \nu $$ at nonzero recoil from $$2+1$$-flavor lattice QCD Open

Alexei Bazavov, Carleton DeTar, D. Du, A. X. El-Khadra, E. Gámiz , et al. · 2022

FLAG Review 2021 Open

Yasumichi Aoki, Tom Blum, Gilberto Colangelo, Sara Collins, Michele Della Morte , et al. · 2022

Decay Constants $f_B$ and $f_{B_s}$ from HISQ Simulations Open

A. Bazavov, C. Bérnard, Chris Bouchard, N. Brown, Carleton DeTar , et al. · 2022

We give a progress report on a project aimed at a high-precision calculation of the decay constants $f_B$ and $f_{B_s}$ from simulations with HISQ heavy and light valence and sea quarks. Calculations are carried out with several heavy vale…

Towards a QCD equation of state with 2 + 1 + 1 flavors using the HISQ action Open

A. Bazavov, C. Bérnard, C. DeTar, J. Foley, Steven Gottlieb , et al. · 2022

We present first, preliminary results for the QCD equation of state with 2+1+1 flavors of highly improved staggered quarks (HISQ), that is, including the effects of a dynamical charm quark. This first study uses a line of constant physics …

Editorial: Physical Review D expands coverage of astrophysics and astronomy Open

Mirjam Cvetič, Urs M. Heller · 2022

Physical Review D is a leading journal in high-energy physics, gravitation, and cosmology, and it already has a strong presence in astrophysics, covering particle astrophysics, gravitational waves, cosmic-ray physics, and dark matter.For e…

Editorial: Physical Review D expands coverage of astrophysics and astronomy Open

Mirjam Cvetič, Urs M. Heller · 2022

Physical Review D is a leading journal in high-energy physics, gravitation, and cosmology, and it already has a strong presence in astrophysics, covering particle astrophysics, gravitational waves, cosmic-ray physics, and dark matter.For e…

FLAG Review 2021 Open

Yasumichi Aoki, Yasumichi Aoki, Thomas Blum, Gilberto Colangelo, Sara Collins , et al. · 2021

We review lattice results related to pion, kaon, $D$-meson, $B$-meson, and nucleon physics with the aim of making them easily accessible to the nuclear and particle physics communities. More specifically, we report on the determination of …

Semileptonic form factors for $B \\to D^\\ast\\ell\\nu$ at nonzero recoil\n from 2 + 1-flavor lattice QCD Open

Alexei Bazavov, Carleton DeTar, Daping Du, A. X. El-Khadra, E. Gámiz , et al. · 2021

We present the first unquenched lattice-QCD calculation of the form factors\nfor the decay $B\\rightarrow D^\\ast\\ell\\nu$ at nonzero recoil. Our analysis\nincludes 15 MILC ensembles with $N_f=2+1$ flavors of asqtad sea quarks, with a\nst…

FLAG Review 2019 Open

Sinya Aoki, Yasumichi Aoki, Damir Bečirević, Tom Blum, Gilberto Colangelo , et al. · 2020

decay from lattice QCD Open

Alexei Bazavov, C. Bérnard, Carleton DeTar, Daping Du, A. X. El-Khadra , et al. · 2019

We use lattice QCD to calculate the form factors f+(q²) and f₀(q²) for the semileptonic decay Bs→Kℓν. Our calculation uses six MILC asqtad 2+1 flavor gauge-field ensembles with three lattice spacings. At th…

from decay and four-flavor lattice QCD Open

A. Bazavov, C. Bérnard, Carleton DeTar, Daping Du, A. X. El-Khadra , et al. · 2019

Using HISQ $N_f=2+1+1$ MILC ensembles with five different values of the lattice spacing, including four ensembles with physical quark masses, we have performed the most precise computation to date of the $K opiell u$ vector form factor at …

D meson semileptonic decay form factors at $q^2 = 0$ Open

Ruizi Li, A. Bazavov, Carleton DeTar, Claude W. Bernard, D. Du , et al. · 2019

We discuss preliminary results for the vector form factors $f_+^{\\{\\pi,K\\}}$ at zero-momentum transfer for the decays $D\\to\\pi\\ell\\nu$ and $D\\to K \\ell\\nu$ using MILC's $N_f = 2+1+1$ HISQ ensembles at four lattice spacings, $a \\…

Lattice computation of the electromagnetic contributions to kaon and pion masses Open

Subhasish Basak, Alexei Bazavov, C. Bérnard, Carleton DeTar, L. Levkova , et al. · 2019

We present a lattice calculation of the electromagnetic (EM) effects on the masses of light pseudoscalar mesons. The simulations employ 2 + 1 dynamical flavors of asqtad QCD quarks and quenched photons. Lattice spacings vary from approxima…

$D$ meson Semileptonic Decay Form Factors at $q^2 = 0$ Open

Ruizi Li, A. Bazavov, Claude W. Bernard, Carleton DeTar, Daping Du , et al. · 2019

We discuss preliminary results for the vector form factors $f_+^{\{π,K\}}$ at zero-momentum transfer for the decays $D\toπ\ellν$ and $D\to K \ellν$ using MILC's $N_f = 2+1+1$ HISQ ensembles at four lattice spacings, $a \approx 0.042, 0.06,…

- and -meson leptonic decay constants from four-flavor lattice QCD Open

A. Bazavov, C. Bernard, N. Brown, Carleton DeTar, A. X. El-Khadra , et al. · 2018

We calculate the leptonic decay constants of heavy-light pseudoscalar mesons\nwith charm and bottom quarks in lattice quantum chromodynamics on four-flavor\nQCD gauge-field configurations with dynamical $u$, $d$, $s$, and $c$ quarks. We\na…

B- and D-meson leptonic decay constants and quark masses from four-flavor lattice QCD Open

Fermilab Lattice, Milc, TUMQCD Collaborations, NULL AUTHOR_ID, A. Bazavov , et al. · 2018

We describe a recent lattice-QCD calculation of the leptonic decay constants of heavy-light pseudoscalar mesons containing charm and bottom quarks and of the masses of the up, down, strange, charm, and bottom quarks. Results for these quan…

Up-, down-, strange-, charm-, and bottom-quark masses from four-flavor lattice QCD Open

Alexei Bazavov, C. Bérnard, Nora Brambilla, N. Brown, Carleton DeTar , et al. · 2018

We calculate the up-, down-, strange-, charm-, and bottom-quark masses using\nthe MILC highly improved staggered-quark ensembles with four flavors of\ndynamical quarks. We use ensembles at six lattice spacings ranging from\n$a\\approx0.15$…

Spectroscopy using the Anisotropic Clover Action Open

Robert G. Edwards, Urs M. Heller, David Richards · 2018

The calculation of the light-hadron spectrum in the quenched approximation to QCD using an anisotropic clover fermion action is presented. The tuning of the parameters of the action is discussed, using the pion and rho dispersion relation.…

Exact Chiral Symmetry for Domain Wall Fermions with Finite L{sub s}* Open

Robert G. Edwards, Urs M. Heller · 2018

We show how the standard domain wall action can be simply modified to allow arbitrarily exact chiral symmetry at finite fifth dimensional extent. We note that the method can be used for both quenched and dynamical calculations. We test the…

Moments of Structure Functions in Full QCD Open

Dmitri Dolgov, Richard C. Brower, Stefano Capitani, John Negele, A. Pochinsky , et al. · 2018

Moments of the quark density distribution, moments of the quark helicity distribution, and the tensor charge are calculated in full QCD. Calculations of matrix elements of operators from the operator product expansion have been performed o…

Short-distance matrix elements for -meson mixing from lattice QCD Open

A. Bazavov, C. Bérnard, Chris Bouchard, Chia Cheng Chang, Carleton DeTar , et al. · 2018

We calculate in three-flavor lattice QCD the short-distance hadronic matrix elements of all five ΔC=2 four-fermion operators that contribute to neutral D-meson mixing both in and beyond the Standard Model. We use the MILC Collaboration’s N…

Bs → Kℓv form factors with 2+1 flavors Open

Yuzhi Liu, Jon A. Bailey, A. Bazavov, C. Bernard, Chris Bouchard , et al. · 2018

Using the MILC 2+1 flavor asqtad quark action ensembles, we are calculating the form factors f 0 and f + for the semileptonic B s → Kℓv decay. A total of six ensembles with lattice spacing from ≈ 0.12 to 0.06 fm are being used. At the coar…

D meson semileptonic form factors with HISQ valence and sea quarks Open

Steven Gottlieb, Thomas Primer, A. Bazavov, C. Bérnard, Carleton DeTar , et al. · 2017

We present a calculation of the form factors of the D $\rightarrow$ Klν and D $\rightarrow$ $\pi$lν semileptonic decays at zero momentum transfer, ultimately for the purpose of determining the Cabibbo-KobayashiMaskawa (CKM) matrix elements…

Review of lattice results concerning low-energy particle physics Open

Shunsuke Aoki, Yasumichi Aoki, Damir Bečirević, C. Bernard, Thomas Blum , et al. · 2017

Decay constants $f_B$ and $f_{B_s}$ and quark masses $m_b$ and $m_c$ from HISQ simulations Open

Javad Komijani, A. Bazavov, C. Bérnard, Nora Brambilla, N. Brown , et al. · 2016

We present a progress report on our calculation of the decay constants $f_B$ and $f_{B_s}$ from lattice-QCD simulations with highly-improved staggered quarks. Simulations are carried out with several heavy valence-quark masses on $(2+1+1)$…

Kaon semileptonic decays with $N_f=2+1+1$ HISQ fermions and physical light quark masses Open

E. Gámiz, A. Bazavov, Claude Bernard, Carleton DeTar, Daping Du , et al. · 2016

We discuss the reduction of errors in the calculation of vector the form factor for semileptonic kaon decays with HISQ fermions on the N_f=2+1+1 MILC configurations from increased statistics on some key ensembles, new data on ensembles wit…

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