68 citations · 264 across the 12 of their papers we have counts for
18 papers · 1 filter
Bjorken sum rule down to the elastic region from the lattice
J. A. Crawford, A. Hannaford-Gunn, R. Horsley +6
We present a lattice determination of the Bjorken sum rule via a Feynman-Hellmann calculation of the polarised forward Compton amplitude. We evaluate the lowest moment of the nucle…
Towards nucleon structure function moments and parton momentum fractions from lattice QCD
K. U. Can, R. Horsley, P. E. L. Rakow +4
We calculate the lowest even isovector moment of the structure function in -flavour lattice QCD with varying quark masses corresponding to $m_π\approx [410, 360, 300] \;…
Gross-Llewellyn Smith sum rule from lattice QCD
K. Utku Can, Joshua A. Crawford, Roger Horsley +6
We compute the Gross-Llewellyn Smith sum rule, i.e. the lowest odd moment of the parity-violating structure function, , of the nucleon from a lattice QCD calculation of the Co…
Transverse force distributions in the proton from lattice QCD
K. U. Can, J. A. Crawford, R. Horsley +5
Single-spin asymmetries observed in polarised deep-inelastic scattering are important probes of hadron structure. The Sivers asymmetry provides information about the transverse mom…
Renormalisation Group Equations for 2+1 clover fermions
K. U. Can, R. Horsley, P. E. L. Rakow +4
Many lattice QCD simulations now have many lattice spacings available, and it is of interest to investigate how they scale. In this talk we first derive renormalisation group equat…
Lattice QCD calculation of the Compton amplitude subtraction function
K. U. Can, A. Hannaford-Gunn, R. Horsley +6
The Compton amplitude subtraction function is an essential component in work concerning both the proton radius puzzle and the proton-neutron mass difference. However, owing to the…
Reconstructing generalised parton distributions from the lattice off-forward Compton amplitude
A. Hannaford-Gunn, K. U. Can, J. A. Crawford +6
We present a determination of the structure functions of the off-forward Compton amplitude and from the Feynman-Hellmann method in lattice QCD. At l…
Feynman--Hellmann approach to transition matrix elements and quasi-degenerate energy states
M. Batelaan, K. U. Can, R. Horsley +6
The Feynman--Hellmann approach to computing matrix elements in lattice QCD by first adding a perturbing operator to the action is described using the transition matrix and the Dyso…
Moments and power corrections of longitudinal and transverse proton structure functions from lattice QCD
M. Batelaan, K. U. Can, A. Hannaford-Gunn +8
We present a simultaneous extraction of the moments of and structure functions of the proton for a range of photon virtuality, . This is achieved by computing the…
The Compton Amplitude, lattice QCD and the Feynman-Hellmann approach
K. U. Can, A. Hannaford-Gunn, R. Horsley +8
A major objective of lattice QCD is the computation of hadronic matrix elements. The standard method is to use three-point and four-point correlation functions. An alternative appr…
Advances in lattice hadron physics calculations using the gradient flow
K. U. Can, R. Horsley, Y. Nakamura +6
Lattice calculations of hadronic observables are aggravated by short-distance fluctuations. The gradient flow, which can be viewed as a particular realisation of the coarse-grainin…
Patterns of flavour symmetry breaking in hadron matrix elements involving u, d and s quarks
J. M. Bickerton, A. N. Cooke, R. Horsley +8
Using an SU(3)-flavour symmetry breaking expansion between the strange and light quark masses, we determine how this constrains the extrapolation of baryon octet matrix elements an…
Applications of the Feynman-Hellmann theorem in hadron structure
A. J. Chambers, R. Horsley, Y. Nakamura +8
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-motiv…
Disconnected contributions to the spin of the nucleon
A. J. Chambers, R. Horsley, Y. Nakamura +8
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 t…
A Feynman-Hellmann approach to the spin structure of hadrons
A. J. Chambers, R. Horsley, Y. Nakamura +8
We perform a Nf = 2 + 1 lattice QCD simulation to determine the quark spin fractions of hadrons using the Feynman-Hellmann theorem. By introducing an external spin operator to the…
Determination of the strange nucleon form factors
P. E. Shanahan, R. Horsley, Y. Nakamura +7
The strange contribution to the electric and magnetic form factors of the nucleon is determined at a range of discrete values of up to GeV. This is done by combinin…
Electric form factors of the octet baryons from lattice QCD and chiral extrapolation
P. E. Shanahan, A. W. Thomas, R. D. Young +7
We apply a formalism inspired by heavy baryon chiral perturbation theory with finite-range regularization to dynamical flavor CSSM/QCDSF/UKQCD Collaboration lattice QCD simul…
Magnetic form factors of the octet baryons from lattice QCD and chiral extrapolation
P. E. Shanahan, R. Horsley, Y. Nakamura +7
We present a 2+1--flavor lattice QCD calculation of the electromagnetic Dirac and Pauli form factors of the octet baryons. The magnetic Sachs form factor is extrapolated at six fix…