Aidan Chambers
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View article: Hadron structure and the Feynman-Hellmann theorem in lattice quantum chromodynamics
Hadron structure and the Feynman-Hellmann theorem in lattice quantum chromodynamics Open
The vast majority of visible matter in the universe is made up of protons and
\nneutrons, the fundamental building blocks of atomic nuclei. Protons and neutrons
\nare examples of hadrons, composite states formed from point-like quarks and …
View article: Electromagnetic form factors at large momenta from lattice QCD
Electromagnetic form factors at large momenta from lattice QCD Open
Accessing hadronic form factors at large momentum transfers has traditionally presented a challenge for lattice QCD simulations. Here we demonstrate how a novel implementation of the Feynman-Hellmann method can be employed to calculate had…
View article: Nucleon Structure Functions from Operator Product Expansion on the Lattice
Nucleon Structure Functions from Operator Product Expansion on the Lattice Open
Deep-inelastic scattering, in the laboratory and on the lattice, is most instructive for understanding how the nucleon is built from quarks and gluons. The long-term goal is to compute the associated structure functions from first principl…
View article: Hadron Structure from the Feynman-Hellmann Theorem
Hadron Structure from the Feynman-Hellmann Theorem Open
The determination of hadronic form factors at large momentum transfers has been a challenging problem in lattice QCD simulations. Here we show how the Feynman-Hellmann method may be extended to non-forward matrix elements to calculate hadr…
View article: Applications of the Feynman-Hellmann theorem in hadron structure
Applications of the Feynman-Hellmann theorem in hadron structure Open
The Feynman-Hellmann (FH) relation offers an alternative way of accessing hadronic matrix elements through artificial modifications to the QCD Lagrangian.In particular, a FH-motivated method provides a new approach to calculations of disco…
View article: Disconnected contributions to the spin of the nucleon
Disconnected contributions to the spin of the nucleon Open
The spin decomposition of the proton is a long-standing topic of much interest in hadronic physics. Lattice QCD has had much success in calculating the connected contributions to the quark spin. However complete calculations, which necessa…
View article: Applications of the Feynman-Hellmann theorem in hadron structure
Applications of the Feynman-Hellmann theorem in hadron structure Open
The Feynman-Hellmann (FH) relation offers an alternative way of accessing hadronic matrix elements through artificial modifications to the QCD Lagrangian. In particular, a FH-motivated method provides a new approach to calculations of disc…
View article: Connected and disconnected quark contributions to hadron spin
Connected and disconnected quark contributions to hadron spin Open
By introducing an external spin operator to the fermion action, the quark spin fractions of hadrons are determined from the linear response of the hadron energies using the Feynman-Hellmann (FH) theorem.At our SU(3)-flavour symmetric point…