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16 papers · 2 filters
Mesonic Form Factors
LHPC Collaboration, Frederic D. R. Bonnet, Robert G. Edwards +3
We have started a program to compute the electromagnetic form factors of mesons. We discuss the techniques used to compute the pion form factor and present preliminary results comp…
Topological Charge Evolution in the Markov-Chain of QCD
Derek B. Leinweber, Anthony G. Williams, Jian-bo Zhang +1
The topological charge is studied on lattices of large physical volume and fine lattice spacing. We illustrate how a parity transformation on the SU(3) link-variables of lattice ga…
Two Nucleons on a Lattice
S. R. Beane, P. F. Bedaque, A. Parreno +1
The two-nucleon sector is near an infrared fixed point of QCD and as a result the S-wave scattering lengths are unnaturally large compared to the effective ranges and shape paramet…
Baryon operators and spectroscopy in lattice QCD
LHP Collaboration, S. Basak, R. Edwards +7
The construction of the operators and correlators required to determine the excited baryon spectrum is presented, with the aim of exploring the spatial and spin structure of the st…
The pion electromagnetic form factor
Frederic D. R. Bonnet, Robert G. Edwards, George T. Fleming +2
A ratio of lattice correlation functions is identified from which the pion form factor can be obtained directly. Preliminary results from quenched Wilson simulations are presented.
Mass spectrum of N* and source optimization
LHP Collaboration, S. Basak, R. Edwards +7
We have computed correlation functions for nucleons and extracted the masses for positive- and negative-parities. Use of group theory plays an important role in obtaining sources t…