We present evidence for the existence of a bound $H$ dibaryon, an $I=0$, $J=0$, $s=\ensuremath{-}2$ state with valence quark structure $uuddss$, at pion mass ${m}_{\ensuremath{\pi}}\ensuremath{\sim}389\text{ }\text{ }\mathrm{MeV}$. Using results lattice QCD calculations performed on four ensembles anisotropic clover gauge-field configurations, spatial extents $L\ensuremath{\sim}2.0$, 2.5, 3.0, and 3.9 fm spacing ${b}_{s}\ensuremath{\sim}0.123\text{ }\mathrm{fm}$, we find dibaryon by...

The binding energies of a range nuclei and hypernuclei with atomic number $A\ensuremath{\le}4$ strangeness $|s|\ensuremath{\le}2$, including the deuteron, dineutron, H-dibaryon, $^{3}\mathrm{He}$, $_{\ensuremath{\Lambda}}^{3}\mathrm{He}$, $^{4}\mathrm{He}$, $_{\ensuremath{\Lambda}}^{4}\mathrm{He}$, $_{\ensuremath{\Lambda}\ensuremath{\Lambda}}^{4}\mathrm{He}$, are calculated in limit flavor-SU(3) symmetry at physical strange-quark mass quantum chromodynamics (without electromagnetic...

Results of a high-statistics, multi-volume Lattice QCD exploration the deuteron, di-neutron, H-dibaryon, and Xi-Xi- system at pion mass m ~ 390 MeV are presented. Calculations were performed with an anisotropic n_f = 2+1 Clover discretization in four lattice volumes spatial extent L 2.0, 2.5, 3.0 4.0 fm, spacing b_s 0.123 fm spatial-direction, b_t b_s/3.5 time-direction. The is found to be bound by B_{Xi-Xi-} 14.0(1.4)(6.7) MeV, consistent expectations based upon phenomenological models...

We calculate the electric dipole moment of nucleon induced by quantum chromodynamics $\ensuremath{\theta}$ term. use gradient flow to define topological charge and ${N}_{f}=2+1$ flavors dynamical quarks corresponding pion masses 700, 570, $410\phantom{\rule{0.16em}{0ex}}\mathrm{MeV}$, perform an extrapolation physical point based on chiral perturbation theory. calculations at three different lattice spacings in range...

The ground-state energies of systems containing up to 12 ${\ensuremath{\pi}}^{+}$'s in a spatial volume $V\ensuremath{\sim}(2.5\text{ }\text{ }\mathrm{fm}{)}^{3}$ are computed dynamical, mixed-action lattice QCD at spacing $\ensuremath{\sim}0.125\text{ }\mathrm{fm}$ for four different values the light-quark masses. Clean signals seen each ground-state, allowing precise extraction both ${\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{+}$ scattering length and...

The ground-state energies of 2, 3, 4 and 5 \pi^+'s in a spatial volume V (2.5 fm)^3 are computed with lattice QCD. By eliminating the leading contribution from three-\pi^+ interactions, particular combinations these n-\pi^+ provide precise extractions \pi^+\pi^+ scattering length agreement that obtained calculations involving only two \pi^+'s. interaction can be isolated by forming other energies. We find result is consistent repulsive for m_\pi < 352 MeV.

The $I=2$ $\ensuremath{\pi}\ensuremath{\pi}$ scattering length is calculated in fully dynamical lattice QCD with domain-wall valence quarks on the asqtad-improved coarse MILC configurations (with fourth-rooted staggered sea quarks) at four light-quark masses. Two- and three-flavor mixed-action chiral perturbation theory next-to-leading order used to perform continuum extrapolations. At physical charged pion mass, we find...

The scattering lengths and effective ranges that describe low-energy nucleon-nucleon are calculated in the limit of SU(3)-flavor symmetry at physical strange-quark mass with Lattice Quantum Chromodynamics. calculations performed an isotropic clover discretization quark action three volumes spatial extents L \sim 3.4 fm, 4.5fm 6.7 a lattice spacing b 0.145 fm. With determinations energies two-nucleon systems (both which contain bound states these up down masses) rest moving volume, Luscher's...

The ${\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{+}$ $s$-wave scattering phase shift is determined below the inelastic threshold using lattice QCD. Calculations were performed at a pion mass of ${m}_{\ensuremath{\pi}}\ensuremath{\sim}390\text{ }\text{ }\mathrm{MeV}$ with an anisotropic ${n}_{f}=2+1$ clover fermion discretization in four volumes, spatial extent $L\ensuremath{\sim}2.0$, 2.5, 3.0 and 3.9 fm, spacing ${b}_{s}\ensuremath{\sim}0.123\text{ }\mathrm{fm}$ direction...

The low-energy nΣ(-) interactions determine, in part, the role of strange quark dense matter, such as that found astrophysical environments. scattering phase shifts for this system are obtained from a numerical evaluation QCD path integral using technique lattice QCD. Our calculations, performed at pion mass m(π)~389 MeV two large volumes and one spacing, extrapolated to physical effective field theory. determined consistent with those extracted hyperon-nucleon experimental data within...

L\"uscher's method is routinely used to determine meson-meson, meson-baryon and baryon-baryon s-wave scattering amplitudes below inelastic thresholds from Lattice QCD calculations - presently at unphysical light-quark masses. In this work we review the formalism develop requisite expressions extract phase-shifts describing meson-meson in partial-waves with angular-momentum l<=6 l=9. The implications of underlying cubic symmetry, strategies for extracting calculations, are presented, along a...

The quantization condition for interacting energy eigenvalues of the two-nucleon system in a finite cubic volume is derived connection to nucleon-nucleon scattering amplitudes. This using an auxiliary (dimer) field formalism that generalized arbitrary partial waves context non-relativistic effective theory. presented gives access parameters systems with parity, spin, isospin, angular momentum and center mass motion, from lattice QCD calculation eigenvalues. In particular, as it includes all...

We present the results of an exploratory lattice QCD calculation three-baryon systems through a high statistics study one ensemble anisotropic clover gauge-field configurations with pion mass ${m}_{\ensuremath{\pi}}\ensuremath{\sim}390\text{ }\text{ }\mathrm{MeV}$. Because computational cost necessary contractions, we focus on correlation functions generated by interpolating operators quantum numbers ${\ensuremath{\Xi}}^{0}{\ensuremath{\Xi}}^{0}n$ system, least demanding in terms number...

Low-energy baryon-baryon interactions are calculated in a high-statistics lattice QCD study on single ensemble of anisotropic-clover gauge-field configurations at pion mass ${m}_{\ensuremath{\pi}}\ensuremath{\sim}390\text{ }\text{ }\mathrm{MeV}$, spatial volume ${L}^{3}\ensuremath{\sim}(2.5\text{ }\mathrm{fm}{)}^{3}$, and spacing $b\ensuremath{\sim}0.123\text{ }\mathrm{fm}$. L\"uscher's method is used to extract nucleon-nucleon, hyperon-nucleon, hyperon-hyperon scattering phase shifts one...

The current constraints from lattice QCD on the existence of H-dibaryon are discussed. With only two significant calculations binding energy at approximately same spacing, forms chiral and continuum extrapolations to physical point not determined. In this brief report, we consider imposed by simple extrapolations. both instances, extrapolation pion mass allows for a bound or near-threshold scattering state. Further required clarify situation.

The energy spectra of two nucleons in a cubic volume provide access to the phase shifts and one mixing angle that define S matrix $^{3}S_{1}\mathrm{\text{\ensuremath{-}}}^{3}D_{1}$ coupled channels containing deuteron. With aid recently derived quantization conditions for such systems, known scattering parameters, these are predicted range volumes. It is found extractions infinite-volume deuteron binding leading including $S$-$D$ at pole, possible from lattice QCD calculations two-nucleon...

We explore the use of twisted boundary conditions in extracting nucleon mass and binding energy two-baryon systems, such as deuteron, from lattice QCD calculations. Averaging results calculations performed with periodic antiperiodic imposed upon light-quark fields, or other pairwise averages, improves volume dependence deuteron $\ensuremath{\sim}{e}^{\ensuremath{-}\ensuremath{\kappa}\mathrm{L}}/\mathrm{L}$ to...

The path integral formulation of quantum mechanical problems including fermions is often affected by a severe numerical sign problem. We show how such problem can be alleviated judiciously chosen constant imaginary offset to the integral. Such integration contour deformations introduce no additional computational cost Hamiltonian Monte Carlo algorithm, while its effective sample size greatly increased. This makes otherwise unviable simulations efficient for wide range parameters. Applying...

Prosthetic joint infections (PJIs) are serious complications of hip and knee arthroplasty. Gram-positive organisms the most common etiology PJIs. Less bacteria certain fungi may also present as culprits on rare occasions. Listeria monocytogenes Histoplasma capsulatum unique etiologies Co-infection with both is even more extraordinary. We a case an immunocompromised host remote history right arthroplasty who presented late PJI. Synovial fluid culture revealed co-infection. Both these...

We present one- and two-body measurements for the Hubbard model on honeycomb (graphene) lattice from ab-initio quantum monte carlo simulations. Of particular interest is excitons, which are particle/hole excitations in low-dimensional systems. They analogous to pion QCD, but without confinement, question of whether they bound stable great condensed matter arena. By measuring correlators across various spin isospin channels we can compute energies relative their thresholds, ultimately...

The sign problem that arises in Hybrid Monte Carlo calculations can be mitigated by deforming the integration manifold. While simple transformations are highly efficient for simulation, their efficacy systematically decreases with decreasing temperature and increasing interaction. Machine learning models have demonstrated ability to push further, but require additional computational effort upfront training. neural networks possess capacity learn physical symmetries through proper training,...

We present one- and two-body measurements for the Hubbard model on honeycomb (graphene) lattice from ab-initio quantum monte carlo simulations. Of particular interest is excitons, which are particle/hole excitations in low-dimensional systems. They analogous to pion QCD, but without confinement, question of whether they bound stable great condensed matter arena. By measuring correlators across various spin isospin channels we can compute energies relative their thresholds, ultimately...