A5034055280- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Black Holes and Theoretical Physics
- Physics of Superconductivity and Magnetism
- Advanced NMR Techniques and Applications
- Cold Atom Physics and Bose-Einstein Condensates
- Atomic and Subatomic Physics Research
- Nuclear physics research studies
- Astrophysics and Cosmic Phenomena
- Algebraic Geometry and Number Theory
- Neutrino Physics Research
- Homotopy and Cohomology in Algebraic Topology
- Algebraic structures and combinatorial models
- Mathematics and Applications
- Polynomial and algebraic computation
- Advanced Differential Equations and Dynamical Systems
- Random Matrices and Applications
- Alkaloids: synthesis and pharmacology
- Advanced Combinatorial Mathematics
- Advanced Chemical Physics Studies
Brookhaven National Laboratory
2021-2024
Helmholtz Institute Mainz
2018-2023
Technical University of Darmstadt
2022-2023
Deutsches Elektronen-Synchrotron DESY
2022-2023
Johannes Gutenberg University Mainz
2018-2023
GSI Helmholtz Centre for Heavy Ion Research
2021-2023
University of Bonn
2022-2023
Lawrence Berkeley National Laboratory
2019-2023
John von Neumann Institute for Computing
2022-2023
Intel (Germany)
2023
This Letter presents the first lattice QCD computation of coupled channel <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mi>π</a:mi><a:mi mathvariant="normal">Σ</a:mi><a:mtext>−</a:mtext><a:mover accent="true"><a:mrow><a:mi>K</a:mi></a:mrow><a:mrow><a:mo stretchy="false">¯</a:mo></a:mrow></a:mover><a:mi>N</a:mi></a:mrow></a:math> scattering amplitudes at energies near 1405 MeV. These contain resonance <f:math xmlns:f="http://www.w3.org/1998/Math/MathML"...
A lattice QCD computation of the coupled channel <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mi>π</a:mi><a:mi mathvariant="normal">Σ</a:mi><a:mi>–</a:mi><a:mover accent="true"><a:mi>K</a:mi><a:mo stretchy="false">¯</a:mo></a:mover><a:mi>N</a:mi></a:math> scattering amplitudes in <f:math xmlns:f="http://www.w3.org/1998/Math/MathML" display="inline"><f:mi mathvariant="normal">Λ</f:mi><f:mo stretchy="false">(</f:mo><f:mn>1405</f:mn><f:mo...
We present the three-pion spectrum with maximal isospin in a finite volume determined from lattice QCD, including excited states addition to ground across various irreducible representations at zero and nonzero total momentum. The required correlation functions, which is extracted, are computed using newly implemented algorithm speeds up computation by more than an order of magnitude. On subset data we extract value threshold scattering amplitude $1/L$ expansion three-particle quantization...
We present the first study of baryon-baryon interactions in continuum limit lattice QCD, finding unexpectedly large artifacts. Specifically, we determine binding energy $H$ dibaryon at a single quark-mass point. The calculation is performed six values spacing $a$, using $\mathrm{O}(a)$-improved Wilson fermions SU(3)-symmetric point with ${m}_{\ensuremath{\pi}}={m}_{K}\ensuremath{\approx}420\text{ }\text{ }\mathrm{MeV}$. Energy levels are extracted by applying variational method to...
We report the first lattice QCD calculation of pion valence quark distribution with next-to-next-to-leading order perturbative matching correction, which is done using two fine lattices spacings a=0.04 and 0.06 fm mass m_{π}=300 MeV, at boost momentum as large 2.42 GeV. As a crucial step to control systematics, we renormalize quasidistribution in recently proposed hybrid scheme, features Wilson-line subtraction distances coordinate space, develop procedure match it MS[over ¯] scheme....
An implementation of estimating the two-to-two $K$-matrix from finite-volume energies based on L\"uscher formalism and involving a Hermitian matrix known as "box matrix" is described. The method includes higher partial waves multiple decay channels. Two fitting procedures for parameters, which properly incorporate all statistical covariances, are discussed. Formulas software handling total spins up to $S=2$ orbital angular momenta $L=6$ obtained in several directions. First tests...
We report on the first application of stochastic Laplacian Heaviside method for computing multi-particle interactions with lattice QCD to two-nucleon system. Like method, this allows construction interpolating operators which can be used construct a positive definite set correlation functions, unlike nearly all other applications two nucleons in literature. It also variational analysis optimal linear combinations are formed that couple predominantly eigenstates Utilizing such methods has...
A bstract We study two- and three-meson systems composed either of pions or kaons at maximal isospin using Monte Carlo simulations lattice QCD. Utilizing the stochastic LapH method, we are able to determine hundreds three-particle energy levels, in nine different momentum frames, with high precision. fit these levels relativistic finite-volume formalism based on a generic effective field theory order parameters K-matrices. find that statistical precision our spectra is sufficient probe not...
We present lattice QCD calculations of the valence parton distribution function (PDF) pion employing next-to-next-leading-order (NNLO) perturbative matching. Our are based on three gauge ensembles $2+1$ flavor highly improved staggered quarks and Wilson-Clover valance quarks, corresponding to mass ${m}_{\ensuremath{\pi}}=140\text{ }\text{ }\mathrm{MeV}$ at a spacing $a=0.076\text{ }\mathrm{fm}$ ${m}_{\ensuremath{\pi}}=300\text{ $a=0.04$, 0.06 fm. This enables us present, for first time,...
We present a lattice QCD determination of the distribution amplitude (DA) pion and first few Mellin moments from an analysis quasi-DA matrix element within leading-twist framework. perform our study on HISQ ensemble with $a=0.076\text{ }\text{ }\mathrm{fm}$ spacing Wilson-clover valence quark mass tuned to physical point. analyze ratios elements at short distances using operator product expansion (OPE) next-to-leading order conformal OPE leading-logarithmic order. find robust result for...
Elastic nucleon-pion scattering amplitudes are computed using lattice QCD on a single ensemble of gauge field configurations with Nf=2+1 dynamical quark flavors and mπ=200MeV. The s-wave lengths both total isospins I=1/2 I=3/2 inferred from the finite-volume spectrum below inelastic threshold together p-wave containing Δ(1232) resonance. well-described by effective range expansion parameters constrained fits to energy levels, enabling determination length statistical errors 5%, while is...
We present a lattice QCD calculation of the unpolarized isovector quark parton distribution function (PDF) proton utilizing perturbative matching at next-to-next-to-leading-order (NNLO). The calculations are carried out using single ensemble gauge configurations generated with $N_f = 2 + 1$ highly-improved staggered quarks physical masses and spacing $a 0.076$ fm. use one iteration hypercubic smearing on these configurations, resulting smeared then used for all aspects subsequent...
The elastic $I=1/2$, $s$- and $p$-wave kaon-pion scattering amplitudes are calculated using a single ensemble of anisotropic lattice QCD gauge field configurations with $N_{\mathrm{f}} = 2+1$ flavors dynamical Wilson-clover fermions at $m_{\pi} 230\mathrm{MeV}$. A large spatial extent $L 3.7\mathrm{fm}$ enables good energy resolution while partial wave mixing due to the reduced symmetries finite volume is treated explicitly.The amplitude well described by Breit-Wigner shape parameters...
A bstract We study the interactions of systems two and three nondegenerate mesons composed pions kaons at maximal isospin using lattice QCD, specifically π + K , . Utilizing stochastic LapH method, we determine spectrum these on CLS N f = 2 1 ensembles with pion masses 200 MeV 340 MeV, include many levels in different momentum frames. constrain matrices describing two- three-particle by fitting to results predicted finite-volume formalism, including up p waves. This requires also for...
We present a lattice QCD calculation of the transversity isovector- and isoscalar-quark parton distribution functions (PDFs) proton utilizing perturbative matching at next-to-leading-order (NLO) accuracy. Additionally, we determine isovector isoscalar tensor charges for proton. In both calculations, disconnected contributions to matrix elements have been ignored. The calculations are performed using single ensemble <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"...
We use lattice QCD calculations of the finite-volume spectra systems two and three mesons to determine, for first time, three-particle scattering amplitudes with physical quark masses. Our results are combinations $\pi^+$ $K^+$, at a spacing $a=0.063\;$fm, in isospin-symmetric limit. also obtain accurate maximal-isospin two-meson amplitudes, those $\pi^+ K^+$ $2K^+$ being determinations point. Dense obtained using stochastic Laplacian-Heaviside method, analysis leading is done relativistic...
The phenomenological consequences of the residual Z^s_2 and Zbar^s_2 symmetries are explored in detail. With a precisely measured value reactor angle, these two predict distinct distributions for Dirac CP phase atmospheric which leads to possibility identifying them at neutrino experiments. For both symmetries, it is possible resolve mass hierarchy most parameter space, they can be distinguished from one another if true symmetry angle non-maximal. These results obtained using an equally...
We report the first lattice QCD computation of pion and kaon electromagnetic form factors, <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:msub><a:mrow><a:mi>F</a:mi></a:mrow><a:mrow><a:mi>M</a:mi></a:mrow></a:msub><a:mo stretchy="false">(</a:mo><a:msup><a:mrow><a:mi>Q</a:mi></a:mrow><a:mrow><a:mn>2</a:mn></a:mrow></a:msup><a:mo stretchy="false">)</a:mo></a:mrow></a:math>, at large momentum transfer up to 10 <e:math...
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 approach employed to determine lowest few partial waves ground- excited-state energies computed correlation matrices rotated pivot using generalized eigenvector solution. This analysis requires evaluating of functions between single- two-hadron interpolating...
Lattice calculations allow us to probe the low-lying, non-perturbative spectrum of QCD using first principles numerical methods. Here we present low-lying in scalar sector with vacuum quantum numbers including, fully dynamical for time, mixing between glueball, q-qbar, and meson-meson operators.
This letter presents the first lattice QCD computation of coupled channel $\pi\Sigma-\bar{K}N$ scattering amplitudes at energies near $1405\,{\rm MeV}$. These contain resonance $\Lambda(1405)$ with strangeness $S=-1$ and isospin, spin, parity quantum numbers $I(J^P)=0(1/2^-)$. However, whether there is a single or two nearby poles in this region controversial theoretically experimentally. Using single-baryon meson-baryon operators to extract finite-volume stationary-state obtain slightly...
A lattice QCD computation of the coupled channel $\pi\Sigma-\bar{K}N$ scattering amplitudes in $\Lambda(1405)$ region is detailed. Results are obtained using a single ensemble gauge field configurations with $N_{\rm f} = 2+1$ dynamical quark flavors and $m_{\pi} \approx 200$ MeV $m_K\approx487$ MeV. Hermitian correlation matrices both baryon meson-baryon interpolating operators for variety different total momenta irreducible representations used. Several parametrizations two-channel...
We report a study of the scattering two octet baryons using lattice QCD. The baryon-baryon spectrum is computed distillation on eight ensembles spanning six spacings and multiple volumes, all at SU(3) flavor symmetric point with $m_\pi=m_K\approx 420$ MeV. Using finite-volume quantization conditions, we determine phase shift presence bound states. Focusing $H$ dibaryon, our results show large discretization effects: in continuum, binding energy $B_H=4.56\pm1.13\pm0.63$ MeV, whereas coarsest...
The results previously obtained from the model-independent application of a generalized hidden horizontal<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M2"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="double-struck">Z</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>symmetry to neutrino mass matrix are updated using latest global fits for oscillation parameters. resulting prediction Dirac<mml:math...