O. Witzel

activity

19992026

most citedEvidence for the Higgs-boson Yukawa coupling to tau leptons with the ATLAS detector

259 citations · 1.6k across the 79 of their papers we have counts for

collaborators

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63 papers · 1 filter

hep-lat2026

Confinement transition to gravitational waves in the one-flavor $S U (4)$ Hyper Stealth Dark Matter theory

V. Ayyar, R. C. Brower, G. T. Fleming +11

The thermodynamics of the $S U (4)$ gauge theory with a single flavor of fundamental quarks is analyzed on the lattice with dynamical fermion simulations, which is the low-energy sec…

hep-lat2025

Symmetric Mass Generation

Anna Hasenfratz, Oliver Witzel

In recent years tantalizing signs for a novel phase have been reported that is chirally symmetric but nevertheless exhibits massive bound states. The necessary condition for such a…

hep-lat2024

Investigating SU(3) with Nf=8 fundamental fermions at strong renormalized coupling

Anna Hasenfratz, Oliver Witzel

Lattice simulations have observed a novel strong coupling symmetric mass generation (SMG) phase for the SU(3) gauge system with $N_{f} = 8$ fundamental fermions (represented by two set…

hep-lat2023★ 2 cited

Stealth dark matter spectrum using LapH and Irreps

Richard C. Brower, Christopher Culver, Kimmy K. Cushman +17

We present non-perturbative lattice calculations of the low-lying meson and baryon spectrum of the SU(4) gauge theory with fundamental fermion constituents. This theory is one inst…

hep-lat2023

Infrared fixed point of the SU(3) gauge theory with $N_{f} = 10$ flavors

Anna Hasenfratz, Ethan T. Neil, Yigal Shamir +2

We use lattice simulations and the continuous renormalization-group method, based on the gradient flow, to calculate the $β$ function and anomalous dimensions of the SU(3) gauge th…

hep-lat2023★ 16 cited

Infrared fixed point and anomalous dimensions in a composite Higgs model

Anna Hasenfratz, Ethan T. Neil, Yigal Shamir +2

We use lattice simulations and the continuous renormalization-group method, based on the gradient flow, to study a candidate theory of composite Higgs and a partially composite top…

hep-lat2023★ 20 cited

Hidden Conformal Symmetry from the Lattice

LSD Collaboration, T. Appelquist, R. C. Brower +14

We analyze newly expanded and refined data from lattice studies of an SU(3) gauge theory with eight Dirac fermions in the fundamental representation. We focus on the light composit…

hep-lat2023★ 12 cited

$Λ$ parameter of the SU(3) Yang-Mills theory from the continuous $β$ function

Anna Hasenfratz, Curtis Taylor Peterson, Jake van Sickle +1

Nonperturbative determinations of the renormalization group $β$ function are essential to connect lattice results to perturbative predictions of strongly coupled gauge theories and…

hep-lat2022★ 1 cited

B Meson Decay Constants Using Relativistic Heavy Quarks

Matthew Black, Oliver Witzel

We present an update on ongoing work to extract pseudoscalar and vector decay constants for $B^{(*)}$ , $B_{s}^{(*)}$ and $B_{c}^{(*)}$ mesons and determine phenomenologically-interesti…

hep-lat2022

Gradient flow scale setting with tree-level improvement

Christian Schneider, Anna Hasenfratz, Oliver Witzel

Lattice scales defined using gradient flow are typically very precise, while also easy to calculate. However, different definitions of flows and operators can differ significantly,…

hep-lat2022★ 10 cited

Gradient flow step-scaling function for SU(3) with $N_{f} = 8$ fundamental flavors

Anna Hasenfratz, Claudio Rebbi, Oliver Witzel

The step-scaling function, the lattice analog of the renormalization group $β$ function, is presented for the SU(3) gauge system with eight flavors in the fundamental representatio…

hep-lat2022★ 4 cited

Gradient flow step-scaling function for SU(3) with $N_{f}$ = 6 or 4 fundamental flavors

Anna Hasenfratz, Claudio Rebbi, Oliver Witzel

Nonperturbative determinations of the renormalization group (RG) $β$ function are crucial to understand properties of gauge-fermion systems at strong coupling and connect lattice s…

hep-lat2022★ 8 cited

Lattice QCD and Particle Physics

Andreas S. Kronfeld, Tanmoy Bhattacharya, Thomas Blum +79

Contribution from the USQCD Collaboration to the Proceedings of the US Community Study on the Future of Particle Physics (Snowmass 2021).

hep-lat2022★ 7 cited

A lattice QCD perspective on weak decays of b and c quarks Snowmass 2022 White Paper

Peter A. Boyle, Bipasha Chakraborty, Christine T. H. Davies +32

Lattice quantum chromodynamics has proven to be an indispensable method to determine nonperturbative strong contributions to weak decay processes. In this white paper for the Snowm…

hep-lat2022

A novel nonperturbative renormalization scheme for local operators

Anna Hasenfratz, Christopher J. Monahan, Matthew D. Rizik +2

The gradient flow exponentially suppresses ultraviolet field fluctuations and removes ultraviolet divergences (up to a multiplicative fermionic wavefunction renormalization). It ca…

hep-lat2021★ 1 cited

Form factors for semileptonic $B \to π$ , $B_{s} \to K$ and $B_{s} \to D_{s}$ decays

Jonathan Flynn, Ryan Hill, Andreas Juettner +3

We report on our determinations of $B \to π ℓ ν$ , $B_{s} \to K ℓ ν$ and $B_{s} \to D_{s} ℓ ν$ semileptonic form factors. In addition we discuss the determination of $R$ -ratios testin…

hep-lat2021★ 2 cited

BSM $B - B ˉ$ mixing on JLQCD and RBC/UKQCD $N_{f} = 2 + 1$ DWF ensembles

Peter Boyle, Luigi Del Debbio, Felix Erben +6

We are presenting our ongoing Lattice QCD study on $B - B ˉ$ mixing on several RBC/UKQCD and JLQCD ensembles with 2+1 dynamical-flavour domain-wall fermions, including physical…

hep-lat2021★ 2 cited

Determination of the continuous $β$ function of SU(3) Yang-Mills theory

Curtis T. Peterson, Anna Hasenfratz, Jake van Sickle +1

In infinite volume the gradient flow transformation can be interpreted as a continuous real-space Wilsonian renormalization group (RG) transformation. This approach allows one to d…

hep-lat2020★ 21 cited

Stealth dark matter confinement transition and gravitational waves

R. C. Brower, K. Cushman, G. T. Fleming +11

We use non-perturbative lattice calculations to investigate the finite-temperature confinement transition of stealth dark matter, focusing on the regime in which this early-univers…

hep-lat2020★ 7 cited

Dislocations under gradient flow and their effect on the renormalized coupling

Anna Hasenfratz, Oliver Witzel

Non-zero topological charge is prohibited in the chiral limit of gauge-fermion systems because any instanton would create a zero mode of the Dirac operator. On the lattice, however…

hep-lat2020★ 24 cited

Gradient flow step-scaling function for SU(3) with ten fundamental flavors

Anna Hasenfratz, Claudio Rebbi, Oliver Witzel

We calculate the step scaling function, the lattice analog of the renormalization group $β$ -function, for an SU(3) gauge theory with ten fundamental flavors. We present a detailed…

hep-lat2019★ 1 cited

Constructing a composite Higgs model with built-in large separation of scales

Oliver Witzel, Anna Hasenfratz

Experimentally the existence of a light 125 GeV Higgs boson is well established but so far no other heavier resonances have been observed. Viable models to describe the Higgs boson…

hep-lat2019★ 2 cited

Semileptonic $B \to π ℓ ν$ , $B \to D ℓ ν$ , $B_{s} \to K ℓ ν$ , and $B_{s} \to D_{s} ℓ ν$ decays

Jonathan Flynn, Ryan Hill, Andreas Jüttner +3

We present updates for our nonperturbative lattice QCD calculations to determine semileptonic form factors for exclusive $B \to π ℓ ν$ , $B \to D ℓ ν$ , $B_{s} \to K ℓ ν$ , and $B_s\t…

hep-lat2019★ 2 cited

Continuous $β$ function for the SU(3) gauge systems with two and twelve fundamental flavors

Anna Hasenfratz, Oliver Witzel

The gradient flow transformation can be interpreted as continuous real-space renormalization group transformation if a coarse-graining step is incorporated as part of calculating e…

Confinement transition to gravitational waves in the one-flavor SU(4) Hyper Stealth Dark Matter theory

Symmetric Mass Generation

Investigating SU(3) with Nf=8 fundamental fermions at strong renormalized coupling

Stealth dark matter spectrum using LapH and Irreps

Infrared fixed point of the SU(3) gauge theory with Nf​=10 flavors

Infrared fixed point and anomalous dimensions in a composite Higgs model

Hidden Conformal Symmetry from the Lattice

Λ parameter of the SU(3) Yang-Mills theory from the continuous β function

B Meson Decay Constants Using Relativistic Heavy Quarks

Gradient flow scale setting with tree-level improvement

Gradient flow step-scaling function for SU(3) with Nf​=8 fundamental flavors

Gradient flow step-scaling function for SU(3) with Nf​ = 6 or 4 fundamental flavors

Lattice QCD and Particle Physics

A lattice QCD perspective on weak decays of b and c quarks Snowmass 2022 White Paper

A novel nonperturbative renormalization scheme for local operators

Form factors for semileptonic B→π, Bs​→K and Bs​→Ds​ decays

BSM B−Bˉ mixing on JLQCD and RBC/UKQCD Nf​=2+1 DWF ensembles

Determination of the continuous β function of SU(3) Yang-Mills theory

Stealth dark matter confinement transition and gravitational waves

Dislocations under gradient flow and their effect on the renormalized coupling

Gradient flow step-scaling function for SU(3) with ten fundamental flavors

Constructing a composite Higgs model with built-in large separation of scales

Semileptonic B→πℓν, B→Dℓν, Bs​→Kℓν, and Bs​→Ds​ℓν decays

Continuous β function for the SU(3) gauge systems with two and twelve fundamental flavors

Confinement transition to gravitational waves in the one-flavor $S U (4)$ Hyper Stealth Dark Matter theory

Infrared fixed point of the SU(3) gauge theory with $N_{f} = 10$ flavors

$Λ$ parameter of the SU(3) Yang-Mills theory from the continuous $β$ function

Gradient flow step-scaling function for SU(3) with $N_{f} = 8$ fundamental flavors

Gradient flow step-scaling function for SU(3) with $N_{f}$ = 6 or 4 fundamental flavors

Form factors for semileptonic $B \to π$ , $B_{s} \to K$ and $B_{s} \to D_{s}$ decays

BSM $B - B ˉ$ mixing on JLQCD and RBC/UKQCD $N_{f} = 2 + 1$ DWF ensembles

Determination of the continuous $β$ function of SU(3) Yang-Mills theory

Semileptonic $B \to π ℓ ν$ , $B \to D ℓ ν$ , $B_{s} \to K ℓ ν$ , and $B_{s} \to D_{s} ℓ ν$ decays

Continuous $β$ function for the SU(3) gauge systems with two and twelve fundamental flavors