149 citations · 1.1k across the 36 of their papers we have counts for
37 papers
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…
Transverse force distributions in the proton from lattice QCD
J. A. Crawford, K. U. Can, R. Horsley +5
Single-spin asymmetries observed in polarised deep-inelastic scattering are important probes of hadron structure. The Sivers asymmetry has been the focus of much attention in QCD p…
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…
Constraining beyond the Standard Model nucleon isovector charges
R. E. Smail, M. Batelaan, R. Horsley +8
At the TeV scale, low-energy precision observations of neutron characteristics provide unique probes of novel physics. Precision studies of neutron decay observables are susceptibl…
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…
State mixing and masses of the , and mesons from lattice QCD+QED
Z. R. Kordov, R. Horsley, W. Kamleh +8
We present a lattice analysis of the light pseudoscalar mesons with consideration for the mixing between the flavour-neutral states , and . We extract the masses…
Electromagnetic form factors at large momenta from lattice QCD
A. J. Chambers, J. Dragos, R. Horsley +10
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 t…
Flavour breaking effects in the pseudoscalar meson decay constants
V. G. Bornyakov, R. Horsley, Y. Nakamura +7
The SU(3) flavour symmetry breaking expansion in up, down and strange quark masses is extended from hadron masses to meson decay constants. This allows a determination of the ratio…
Determining the scale in Lattice QCD
V. G. Bornyakov, R. Horsley, R. Hudspith +8
We discuss scale setting in the context of 2+1 dynamical fermion simulations where we approach the physical point in the quark mass plane keeping the average quark mass constant. W…
QED effects in the pseudoscalar meson sector
R. Horsley, Y. Nakamura, H. Perlt +8
We present results on the pseudoscalar meson masses from a fully dynamical simulation of QCD+QED. We concentrate particularly on violations of isospin symmetry. We calculate the $π…
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…
Wilson flow and scale setting from lattice QCD
V. G. Bornyakov, R. Horsley, R. Hudspith +8
We give a determination of the phenomenological value of the Wilson (or gradient) flow scales t0 and w0 for 2+1 flavours of dynamical quarks. The simulations are performed keeping…
Isospin splittings of meson and baryon masses from three-flavor lattice QCD + QED
R. Horsley, Y. Nakamura, H. Perlt +8
Lattice QCD simulations are now reaching a precision where isospin breaking effects become important. Previously, we have developed a program to systematically investigate the patt…
Reply to "Comment on `Lattice determination of Sigma - Lambda mixing' "
R. Horsley, J. Najjar, Y. Nakamura +7
In this Reply, we respond to the above Comment. Our computation [Phys. Rev. D 91 (2015) 074512] only took into account pure QCD effects, arising from quark mass differences, so it…
A lattice determination of Sigma - Lambda mixing
R. Horsley, J. Najjar, Y. Nakamura +7
Isospin breaking effects in baryon octet (and decuplet) masses are due to a combination of up and down quark mass differences and electromagnetic effects and lead to small mass spl…
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…
Charge Symmetry Breaking in Spin Dependent Parton Distributions and the Bjorken Sum Rule
I. C. Cloët, R. Horsley, J. T. Londergan +9
We present the first determination of charge symmetry violation (CSV) in the spin-dependent parton distribution functions of the nucleon. This is done by determining the first two…
Dirac and Pauli form factors from lattice QCD
S. Collins, M. Göckeler, Ph. Hägler +11
We present a comprehensive analysis of the electromagnetic form factors of the nucleon from a lattice simulation with two flavors of dynamical O(a)-improved Wilson fermions. A key…
Nucleon form factors and structure functions
S. Collins, M. Göckeler, Ph. Hägler +13
We give an update on our ongoing efforts to compute the nucleon's form factors and moments of structure functions using Nf=2 flavours of non-perturbatively improved Clover fermions…
Perturbative and Nonperturbative Renormalization in Lattice QCD
M. Göckeler, R. Horsley, Y. Nakamura +8
We investigate the perturbative and nonperturbative renormalization of composite operators in lattice QCD restricting ourselves to operators that are bilinear in the quark fields (…
Results from 2+1 flavours of SLiNC fermions
W. Bietenholz, V. Bornyakov, N. Cundy +12
QCD results are presented for a 2+1 flavour fermion clover action (which we call the SLiNC action). A method of tuning the quark masses to their physical values is discussed. In th…