Daniel Mohler
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View article: Lattice QCD study of πΣ-K¯N scattering and the Λ(1405) resonance
Lattice QCD study of πΣ-K¯N scattering and the Λ(1405) resonance Open
A lattice QCD computation of the coupled channel πΣ–K¯N scattering amplitudes in the Λ(1405) region is detailed. Results are obtained using a single ensemble of gauge field configurations with Nf=2+1 dynamical quark flavors and mπ≈200 MeV …
View article: The Λ(1405) pole structure from Lattice QCD: A coupled-channel πΣ − KN study
The Λ(1405) pole structure from Lattice QCD: A coupled-channel πΣ − KN study Open
This report summarizes results of the first lattice QCD calculation of coupled-channel πΣ − K ¯ N scattering in the Λ(1405) region. This study was carried out using a single CLS ensemble with a heavier-than-physical pion mass m π ≈ 200 MeV…
View article: Low-lying baryon resonances from lattice QCD
Low-lying baryon resonances from lattice QCD Open
Recent results studying the masses and widths of low-lying baryon resonances in lattice QCD are presented. The S-wave Nπ scattering lengths for both total isospins I = 1/2 and I = 3/2 are inferred from the finite-volume spectrum below the …
View article: Precise Omega baryons from lattice QCD
Precise Omega baryons from lattice QCD Open
In this paper we determine the masses of $I(J^P)=0\left(3/2^+\right)$ and $0\left(3/2^-\right)$ $Ω$-baryon ground states using lattice QCD. We utilise Wilson-clover ensembles with $2+1$ dynamical quark flavours generated by the CLS consort…
View article: The Λ(1405) pole structure from Lattice QCD: A coupled-channel <i>π</i>Σ − <i>K</i><i>N</i> study
The Λ(1405) pole structure from Lattice QCD: A coupled-channel <i>π</i>Σ − <i>K</i><i>N</i> study Open
This report summarizes results of the first lattice QCD calculation of coupled-channel πΣ − K ¯ N scattering in the Λ(1405) region. This study was carried out using a single CLS ensemble with a heavier-than-physical pion mass m π ≈ 200 MeV…
View article: Two-Pole Nature of the Λ ( 1405 ) Resonance from Lattice QCD
Two-Pole Nature of the Λ ( 1405 ) Resonance from Lattice QCD Open
This letter presents the first lattice QCD computation of the coupled channel $\pi\Sigma\unicode{x2013}\bar{K}N$ scattering amplitudes at energies near $1405\,{\rm MeV}$. These amplitudes contain the resonance $\Lambda(1405)$ with strangen…
View article: The $\Lambda(1405)$ from Lattice QCD: Determining the Finite-volume Spectra
The $\Lambda(1405)$ from Lattice QCD: Determining the Finite-volume Spectra Open
This work presents technical details of determining the finite-volume energy spectra for the scattering amplitude of the coupled-channel $\\pi\\Sigma - \\bar{K}N$ from lattice QCD data. The importance of reliably extracting such spectra li…
View article: The $Λ(1405)$ from Lattice QCD: Determining the Finite-volume Spectra
The $Λ(1405)$ from Lattice QCD: Determining the Finite-volume Spectra Open
This work presents technical details of determining the finite-volume energy spectra for the scattering amplitude of the coupled-channel $πΣ- \bar{K}N$ from lattice QCD data. The importance of reliably extracting such spectra lies in the c…
View article: Low-lying baryon resonances from lattice QCD
Low-lying baryon resonances from lattice QCD Open
Recent results studying the masses and widths of low-lying baryon resonances in lattice QCD are presented. The $S$-wave $Nπ$ scattering lengths for both total isospins $I = 1/2$ and $I = 3/2$ are inferred from the finite-volume spectrum be…
View article: D meson -- pion scattering on CLS 2+1 flavor ensembles
D meson -- pion scattering on CLS 2+1 flavor ensembles Open
We report progress on finite-volume determinations of heavylight-meson – Goldstone boson scattering phase shifts using the Luescher method on CLS 2+1 flavor gauge field ensembles. In a first iteration we will focus on D-meson – pion scatte…
View article: Intermediate window observable for the hadronic vacuum polarization contribution to the muon $g-2$ from O$(a)$ improved Wilson quarks
Intermediate window observable for the hadronic vacuum polarization contribution to the muon $g-2$ from O$(a)$ improved Wilson quarks Open
Following the publication of the new measurement of the anomalous magnetic moment of the muon, the discrepancy between experiment and the theory prediction from the $g-2$ theory initiative has increased to $4.2\\,\\sigma$. Recent lattice Q…
View article: Non-perturbative heavy quark action tuning using machine learning
Non-perturbative heavy quark action tuning using machine learning Open
We present a fully non-perturbative determination of a relativistic heavy quark action’s parameters on the CLS $n_f=2+1$ Wilson-clover ensembles using neural networks. We then further illustrate the applicability of such an approach for la…
View article: Lattice QCD study of $\pi\Sigma\unicode{x2013}\bar{K}N$ scattering and the $\Lambda(1405)$ resonance
Lattice QCD study of $\pi\Sigma\unicode{x2013}\bar{K}N$ scattering and the $\Lambda(1405)$ resonance Open
A lattice QCD computation of the coupled channel $\pi\Sigma\unicode{x2013}\bar{K}N$ scattering amplitudes in the $\Lambda(1405)$ region is detailed. Results are obtained using a single ensemble of gauge field configurations with $N_{\rm f}…
View article: Intermediate window observable for the hadronic vacuum polarization contribution to the muon $g-2$ from O$(a)$ improved Wilson quarks
Intermediate window observable for the hadronic vacuum polarization contribution to the muon $g-2$ from O$(a)$ improved Wilson quarks Open
Following the publication of the new measurement of the anomalous magnetic moment of the muon, the discrepancy between experiment and the theory prediction from the $g-2$ theory initiative has increased to $4.2\,σ$. Recent lattice QCD calc…
View article: Fully nonperturbative charm-quark tuning using machine learning
Fully nonperturbative charm-quark tuning using machine learning Open
We present a relativistic heavy-quark action tuning for the charm sector on\nensembles generated by the CLS consortium. We tune a particular 5-parameter\naction in an entirely non-perturbative and -- up to the chosen experimental\ninput --…
View article: Window observable for the hadronic vacuum polarization contribution to the muon $g-2$ from lattice QCD
Window observable for the hadronic vacuum polarization contribution to the muon $g-2$ from lattice QCD Open
Euclidean time windows in the integral representation of the hadronic vacuum polarization contribution to the muon $g-2$ serve to test the consistency of lattice calculations and may help in tracing the origins of a potential tension betwe…
View article: Vector and scalar charmonium resonances with lattice QCD
Vector and scalar charmonium resonances with lattice QCD Open
We perform an exploratory lattice QCD simulation of DD¯ scattering, aimed at determining the masses as well as the decay widths of charmonium resonances above open charm threshold. Neglecting coupling to other channels, the resulting phase…
View article: Progress on Meson-Baryon Scattering
Progress on Meson-Baryon Scattering Open
Progress in computing various meson-baryon scattering amplitudes is presented on a single ensemble from the Coordinated Lattice Simulations (CLS) consortium with $m_\pi=200$ MeV and $N_f=2+1$ dynamical fermions. The finite-volume Luscher a…
View article: I=1 $\pi$-$\pi$ scattering at the physical point
I=1 $\pi$-$\pi$ scattering at the physical point Open
We present a preliminary analysis of $I=1$ $\\pi\\,\\pi$ scattering at the\nphysical point. We make use of the stochastic variant of the distillation\nframework (also known as sLapH) to compute the relevant two-point correlation\nmatrices …
View article: Scale setting for CLS 2+1 simulations
Scale setting for CLS 2+1 simulations Open
We present an update of the scale setting for $N_f=2+1$ flavor QCD using gradient flow scales and pseudo-scalar decay constants. We analyze the latest ensembles with $2+1$ flavors of non-perturbatively improved Wilson fermions generated by…
View article: $I=1$ $π$-$π$ scattering at the physical point
$I=1$ $π$-$π$ scattering at the physical point Open
We present a preliminary analysis of $I=1$ $π\,π$ scattering at the physical point. We make use of the stochastic variant of the distillation framework (also known as sLapH) to compute the relevant two-point correlation matrices using a ba…
View article: Scale Setting for CLS 2+1 Simulations
Scale Setting for CLS 2+1 Simulations Open
We present an update of the scale setting for $N_f=2+1$ flavor QCD using gradient flow scales and pseudo-scalar decay constants. We analyze the latest ensembles with $2+1$ flavors of non-perturbatively improved Wilson fermions generated by…
View article: Progress on Meson-Baryon Scattering
Progress on Meson-Baryon Scattering Open
Progress in computing various meson-baryon scattering amplitudes is presented on a single ensemble from the Coordinated Lattice Simulations (CLS) consortium with $m_π=200$ MeV and $N_f=2+1$ dynamical fermions. The finite-volume Lüscher app…
View article: Charmonium-like resonances in coupled $D \bar D$-$D_s \bar D_s$ scattering
Charmonium-like resonances in coupled $D \bar D$-$D_s \bar D_s$ scattering Open
Charmonium-like resonances and bound states with isospin zero and $J^{PC}=0^{++},~1^{--},~2^{++},~3^{--}$ are extracted on the lattice. Coupled $D\bar D$ and $D_s\bar D_s$ scattering suggests three charmonium-like states with $J^{PC}=0^{++…
View article: Isovector electromagnetic form factors of the nucleon from lattice QCD and the proton radius puzzle
Isovector electromagnetic form factors of the nucleon from lattice QCD and the proton radius puzzle Open
We present results for the isovector electromagnetic form factors of the\nnucleon computed on the CLS ensembles with $N_f=2+1$ flavors of\n$\\mathcal{O}(a)$-improved Wilson fermions and an $\\mathcal{O}(a)$-improved\nvector current. The an…
View article: Remarks on strange-quark simulations with Wilson fermions
Remarks on strange-quark simulations with Wilson fermions Open
In the simulation of QCD with 2+1 flavors of Wilson fermions, the positivity of the fermion determinant is generally assumed. We present evidence that this assumption is in general not justified and discuss the consequences of this finding.
View article: Rho resonance, timelike pion form factor, and implications for lattice studies of the hadronic vacuum polarization
Rho resonance, timelike pion form factor, and implications for lattice studies of the hadronic vacuum polarization Open
We study isospin-1 P-wave $\pi\pi$ scattering in lattice QCD with two flavours of O($a$) improved Wilson fermions. For pion masses ranging from $m_\pi=265$ MeV to $m_\pi=437$ MeV, we determine the energy spectrum in the centre-of-mass fram…
View article: The leading hadronic vacuum polarization contribution to the muon anomalous magnetic moment using $N_f = 2+1$ O(a) improved Wilson quarks
The leading hadronic vacuum polarization contribution to the muon anomalous magnetic moment using $N_f = 2+1$ O(a) improved Wilson quarks Open
We present a lattice calculation of the leading hadronic contribution to the anomalous magnetic moment of the muon. This work is based on a subset of the CLS ensembles with $N_f = 2+1$ dynamical quarks and a quenched charm quark. Noise red…
View article: The leading hadronic vacuum polarization contribution to the muon\n anomalous magnetic moment using $N_f=2+1$ O($a$) improved Wilson quarks
The leading hadronic vacuum polarization contribution to the muon\n anomalous magnetic moment using $N_f=2+1$ O($a$) improved Wilson quarks Open
We present a lattice calculation of the leading hadronic contribution to the\nanomalous magnetic moment of the muon. This work is based on a subset of the\nCLS ensembles with $N_f = 2+1$ dynamical quarks and a quenched charm quark.\nNoise …