Ben Hörz
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View article: QCD Predictions for Physical Multimeson Scattering Amplitudes
QCD Predictions for Physical Multimeson Scattering Amplitudes Open
We use lattice QCD calculations of the finite-volume spectra of systems of two and three mesons to determine, for the first time, three-particle scattering amplitudes with physical quark masses. Our results are for combinations of π …
View article: Di-nucleons do not form bound states at heavy pion mass
Di-nucleons do not form bound states at heavy pion mass Open
We perform a high-statistics lattice QCD calculation of the low-energy two-nucleon scattering amplitudes. In order to address discrepancies in the literature, the calculation is performed at a heavy pion mass in the limit that the light qu…
View article: Two- and three-meson scattering amplitudes with physical quark masses from lattice QCD
Two- and three-meson scattering amplitudes with physical quark masses from lattice QCD Open
We study systems of two and three mesons composed of pions and kaons at maximal isospin using four CLS ensembles with $a\approx 0.063\;$fm, including one with approximately physical quark masses. Using the stochastic Laplacian-Heaviside me…
View article: QCD predictions for physical multimeson scattering amplitudes
QCD predictions for physical multimeson scattering amplitudes Open
We use lattice QCD calculations of the finite-volume spectra of systems of two and three mesons to determine, for the first time, three-particle scattering amplitudes with physical quark masses. Our results are for combinations of $π^+$ an…
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: 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: 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: Lattice QCD studies of the $Δ$ baryon resonance and the $K_0^\ast(700)$ and $a_0(980)$ meson resonances: the role of exotic operators in determining the finite-volume spectrum
Lattice QCD studies of the $Δ$ baryon resonance and the $K_0^\ast(700)$ and $a_0(980)$ meson resonances: the role of exotic operators in determining the finite-volume spectrum Open
Studies of the $Δ$ baryon resonance and the $K_0^\ast(700)$ and $a_0(980)$ meson resonances using $N_f=2+1$ lattice QCD for pion masses near 200 MeV are presented. The $s$-wave scattering lengths for both the $I=1/2$ $N π$ and $I=3/2$ $N π…
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: Lattice QCD study of $πΣ-\bar{K}N$ scattering and the $Λ(1405)$ resonance
Lattice QCD study of $πΣ-\bar{K}N$ scattering and the $Λ(1405)$ resonance Open
A lattice QCD computation of the coupled channel $πΣ-\bar{K}N$ scattering amplitudes in the $Λ(1405)$ region is detailed. Results are obtained using a single ensemble of gauge field configurations with $N_{\rm f} = 2+1$ dynamical quark fla…
View article: Two-pole nature of the $Λ(1405)$ from lattice QCD
Two-pole nature of the $Λ(1405)$ from lattice QCD Open
This letter presents the first lattice QCD computation of the coupled channel $πΣ-\bar{K}N$ scattering amplitudes at energies near $1405\,{\rm MeV}$. These amplitudes contain the resonance $Λ(1405)$ with strangeness $S=-1$ and isospin, spi…
View article: Interactions of πK, ππK and KKπ systems at maximal isospin from lattice QCD
Interactions of πK, ππK and KKπ systems at maximal isospin from lattice QCD Open
A bstract We study the interactions of systems of two and three nondegenerate mesons composed of pions and kaons at maximal isospin using lattice QCD, specifically π + K + , π + π + K + and K + K + π + . Utilizing the stochastic LapH metho…
View article: Interactions of $πK$, $ππK$ and $KKπ$ systems at maximal isospin from lattice QCD
Interactions of $πK$, $ππK$ and $KKπ$ systems at maximal isospin from lattice QCD Open
We study the interactions of systems of two and three nondegenerate mesons composed of pions and kaons at maximal isospin using lattice QCD, specifically $π^+K^+$, $π^+π^+K^+$ and $K^+K^+π^+$. Utilizing the stochastic LapH method, we deter…
View article: Elastic nucleon-pion scattering at $m_π$ = 200 MeV from lattice QCD
Elastic nucleon-pion scattering at $m_π$ = 200 MeV from lattice QCD Open
Elastic nucleon-pion scattering amplitudes are computed using lattice QCD on a single ensemble of gauge field configurations with $N_f = 2+1$ dynamical quark flavors and $m_π$ = 200 MeV. The s-wave scattering lengths with both total isospi…
View article: Performance Optimization of Baryon-block Construction in the Stochastic LapH Method
Performance Optimization of Baryon-block Construction in the Stochastic LapH Method Open
Implementations of measurement kernels in high-level Lattice QCD frameworks enable rapid prototyping, but can leave hardware capabilities significantly underutilized. This is an acceptable tradeoff if the time spent in unoptimized routines…
View article: Performance Optimization of Baryon-block Construction in the Stochastic LapH Method
Performance Optimization of Baryon-block Construction in the Stochastic LapH Method Open
Implementations of measurement kernels in high-level Lattice QCD frameworks enable rapid prototyping, but can leave hardware capabilities significantly underutilized. This is an acceptable tradeoff if the time spent in unoptimized routines…
View article: Toward a resolution of the NN controversy
Toward a resolution of the NN controversy Open
Lattice QCD calculations of two-nucleon interactions have been underway for about a decade, but still haven't reached the pion mass regime necessary for matching onto effective field theories and extrapolating to the physical point. Furthe…
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: Spectroscopy and Hadron Interactions
Spectroscopy and Hadron Interactions Open
Lattice QCD spectroscopy and subsequent determinations of scattering amplitudes are an active line of research with notable advances. In the two-hadron sector there has been significant progress in constraining more complicated scattering …
View article: Nucleon Axial Form Factor from Domain Wall on HISQ
Nucleon Axial Form Factor from Domain Wall on HISQ Open
The Deep Underground Neutrino Experiment (DUNE) is an upcoming neutrino oscillation experiment that is poised to answer key questions about the nature of neutrinos. Lattice QCD has the ability to make significant impact upon DUNE, beginnin…
View article: QED with massive photons for precision physics: zero modes and first result for the hadron spectrum
QED with massive photons for precision physics: zero modes and first result for the hadron spectrum Open
The current precision reached by lattice QCD calculations of low-energy hadronic observables, requires not only the introduction of electromagnetic corrections, but also control over all the potential systematic uncertainties introduced by…
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: $H$ dibaryon away from the $SU(3)_f$ symmetric point
$H$ dibaryon away from the $SU(3)_f$ symmetric point Open
We present the current status of our efforts in search of $H$ dibaryon on $N_f$=2+1 CLS ensembles away from the $SU(3)$ flavor symmetric point. Utilizing the distillation framework (also known as LapH) in its exact and stochastic forms, we…
View article: The hyperon spectrum from lattice QCD
The hyperon spectrum from lattice QCD Open
Hyperon decays present a promising alternative for extracting $\vert V_{us} \vert$ from lattice QCD combined with experimental measurements. Currently $\vert V_{us} \vert$ is determined from the kaon decay widths and a lattice calculation …
View article: The hyperon spectrum from lattice QCD
The hyperon spectrum from lattice QCD Open
Hyperon decays present a promising alternative for extracting $\vert V_{us} \vert$ from lattice QCD combined with experimental measurements. Currently $\vert V_{us} \vert$ is determined from the kaon decay widths and a lattice calculation …
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: $H$ dibaryon away from the $SU(3)_f$ symmetric point
$H$ dibaryon away from the $SU(3)_f$ symmetric point Open
We present the current status of our efforts in search of $H$ dibaryon on $N_f$=2+1 CLS ensembles away from the $SU(3)$ flavor symmetric point. Utilizing the distillation framework (also known as LapH) in its exact and stochastic forms, we…
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…