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Showing 1 to 16 of 16 for “"Lattice Quantum Chromodynamics"”.
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Hadron -hadron scattering in lattice quantum chromodynamics
… calculations in fully dynamical, mixed-action Lattice Quantum Chromodynamics using the MILC gauge ensembles in a non-perturbative simulation are discussed. In particular, calculations of the pi+sum+, pi+xi 0, K+p, K+n, and K¯ 0xi0 scattering lengths are presented, and are the main subject …
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Meson Photo-Couplings From Lattice Quantum Chromodynamics
… featuring a vector current insertion in lattice Quantum Chromodynamics. These three-point functions, in general, contain information about many radiative transition matrix elements simultaneously. We develop and implement the technology necessary to isolate a single matrix element via the …
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Weak decays of beautiful pseudoscalar mesons with Lattice Quantum Chromodynamics
… study a selection of decays of $B$ mesons with Lattice Quantum Chromodynamics. After introducing these modern methods, I report on my progress on calculating the vector current form factors for $B_c \to D_s$. This decay is allowed at the one-loop level and so my vector current form factors will …
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An Intermediate Representation for Expressing and Optimizing Computations in Lattice Quantum Chromodynamics
The field of Lattice Quantum Chromodynamics faces massive scaling problems because of the large iteration spaces of the sums required which scale with the factorial of the number of atoms represented. The LQCD IR and rewrite system from this thesis allows tackling these scaling problems quicker and …
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Pionless Effective Field Theory: Building the Bridge Between Lattice Quantum Chromodynamics and Nuclear Physics
We analyze ground state properties of few-nucleons systems and $^{16}$O using \eftnopi (Pionless Effective Field Theory) at \ac{LO}. This is the first time the theory is extended to many-body nuclear systems. The free constants of the interaction are fitted using both experimental data and …
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Delta I Equals Three Halfs Kaon To Two Pion Decays Using Lattice Quantum Chromodynamics with Domain Wall Fermions
… to two pion decays in the 𝛥𝛪 = 3/2 channel using lattice gauge theory simulations. From these we can extract the decay amplitude 𝐴₂, for which the real part is related to the decay rate and can be compared to the experimental result Re(𝐴₂) = 1.484 x 10⁻⁸ GeV, and for which the imaginary part is …
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Use of correlation matrices in lattice QCD
… in analyzing Monte Carlo calculations from lattice quantum chromodynamics. Correlation matrices are a powerful tool for examining many problems in which significant correlations exist, and thus offer potential advantages for lattice QCD. Several models were used to study the relative …
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Computing methods in Hamiltonian lattice gauge theory
… calculations in the Hamiltonian form of lattice quantum chromodynamics. In particular, a simple site-by-site formula is given for the reduction of the direct product of a string configuration with a string-creating operator, and a description is given of a package of FORTRAN subprograms …
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An Optimized Multiple Right-Hand Side Dslash Kernel for Intel Xeon Phi
<p>Lattice quantum chromodynamics (LQCD) stands unique as the only computationally tractable, non-perturbative, and model-independent quantum field theory of the strong nuclear force. The computational core of LQCD is the Wilson Dslash operator, a nearest neighbor stencil operator summing …
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First Step into A New Physics Realm: Search for the Majorana Nature of Neutrinos in the Inverted Mass Ordering Region
… nuclear matrix element for 0𝜈𝛽𝛽 is done using lattice quantum chromodynamics (LQCD) to interpret the experimental data. The preliminary results of 𝑛⁰𝑛⁰ → 𝑝⁺𝑝⁺𝑒⁻𝑒⁻ process for both long-range (light Majorana neutrino exchange) and short-range (heavy Majorana neutrino exchange) contributions are …
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Gravitational form factors of hadrons from lattice QCD
… and can be constrained using the framework of lattice quantum chromodynamics (QCD). In this thesis, we explore the gravitational structure of hadrons through two main results. The first result [1] is an extraction of the gluon GFFs of the pion, nucleon, 𝜌 meson, and Δ baryon as functions of the …
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Hadronic Structure with Classical and Quantum Computing
Calculations in lattice quantum chromodynamics (QCD) — presently the only known systematically improvable approach to describe the strong nuclear force in the nonperturbative regime from first principles — are playing an increasingly important role in revealing how hadrons emerge from the …
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The application of automated perturbation theory to lattice QCD
… elements must be calculated nonperturbatively. Lattice quantum chromodynamics (QCD) provides the framework for nonperturbative calculations of QCD processes. Current lattices are too coarse to directly simulate b quarks. Therefore an effective theory, nonrelativistic QCD (NRQCD), is used to …
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UNRAVELING THE NUCLEON 3D STRUCTURE FROM EXPERIMENT, LATTICE, AND GLOBAL ANALYSIS
… studying the gluonic contributions to the quantum anomalous energy, mass radius, spin and mechanical pressure in the proton. We use the recent GlueX data on the $J/\psi$ photoproduction to illustrate the potential physics impact from the high-precision data from future JLab 12 GeV and EIC …
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Short-distance matrix elements for D-meson mixing for 2+1 flavor lattice QCD
… mixing with partially quenched $N_f=2+1$ lattice QCD. We use a large set of the MIMD Lattice Computation Collaboration's gauge configurations with $a^2$ tadpole-improved staggered sea quarks and tadpole-improved L\""uscher-Weisz gluons. We use the $a^2$ tadpole-improved action for valence …
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Krylov Subspace Methods with Fixed Memory Requirements: Nearly Hermitian Linear Systems and Subspace Recycling
… identity. These problems arise in the theory of quantum chromodynamics, a theory of the behavior of subatomic particles. We wish to build on the class of Krylov methods which allow the simultaneous solution of all shifted linear systems while generating only one subspace. However, the mechanics …