scholarly journals Finite-volume form factors in semi-classical approximation

2003 ◽  
Vol 670 (3) ◽  
pp. 464-478 ◽  
Author(s):  
G. Mussardo ◽  
V. Riva ◽  
G. Sotkov
Keyword(s):  
Finite Volume ◽  
Form Factors ◽  
Volume Form ◽  
Classical Approximation

scholarly journals Finite volume form factors in the presence of integrable defects

2014 ◽  
Vol 882 ◽  
pp. 501-531 ◽  
Author(s):  
Z. Bajnok ◽  
F. Buccheri ◽  
L. Hollo ◽  
J. Konczer ◽  
G. Takacs
Keyword(s):  
Finite Volume ◽  
Form Factors ◽  
Volume Form

scholarly journals Nucleon Axial and Electromagnetic Form Factors

2018 ◽  
Vol 175 ◽  
pp. 06033 ◽  
Author(s):  
Yong-Chull Jang ◽  
Tanmoy Bhattacharya ◽  
Rajan Gupta ◽  
Huey-Wen Lin ◽  
Boram Yoon
Keyword(s):  
Excited States ◽  
Finite Volume ◽  
Magnetic Moment ◽  
Lattice Spacing ◽  
Form Factors ◽  
Electromagnetic Form Factors ◽  
Charge Radii ◽  
Model Independent ◽  
Magnetic Form Factors

We present results for the isovector axial, induced pseudoscalar, electric, and magnetic form factors of the nucleon. The calculations were done using 2 + 1 + 1-flavor HISQ ensembles generated by the MILC collaboration with lattice spacings a ≈ 0.12, 0.09, 0.06 fm and pion masses Mπ ≈ 310, 220, 130 MeV. Excited-states contamination is controlled by using four-state fits to two-point correlators and by comparing two-versus three-states in three-point correlators. The Q2 behavior is analyzed using the model independent z-expansion and the dipole ansatz. Final results for the charge radii and magnetic moment are obtained using a simultaneous fit in Mπ, lattice spacing a and finite volume.

scholarly journals Structure of the Nucleon and its Excitations

2018 ◽  
Vol 175 ◽  
pp. 06019 ◽  
Author(s):  
Waseem Kamleh ◽  
Derek Leinweber ◽  
Zhan-wei Liu ◽  
Finn Stokes ◽  
Anthony Thomas ◽  
...  
Keyword(s):  
Wave Function ◽  
Finite Volume ◽  
Form Factors ◽  
Effective Field ◽  
Radial Excitation ◽  
Nucleon Wave Function ◽  
Scattering State ◽  
Nucleon Spectrum ◽  
Magnetic Form Factors ◽  
Channel Interactions

The structure of the ground state nucleon and its finite-volume excitations are examined from three different perspectives. Using new techniques to extract the relativistic components of the nucleon wave function, the node structure of both the upper and lower components of the nucleon wave function are illustrated. A non-trivial role for gluonic components is manifest. In the second approach, the parity-expanded variational analysis (PEVA) technique is utilised to isolate states at finite momenta, enabling a novel examination of the electric and magnetic form factors of nucleon excitations. Here the magnetic form factors of low-lying odd-parity nucleons are particularly interesting. Finally, the structure of the nucleon spectrum is examined in a Hamiltonian effective field theory analysis incorporating recent lattice-QCD determinations of low-lying two-particle scattering-state energies in the finite volume. The Roper resonance of Nature is observed to originate from multi-particle coupled-channel interactions while the first radial excitation of the nucleon sits much higher at approximately 1.9 GeV.

scholarly journals Boundary form factors in finite volume

2008 ◽  
Vol 803 (3) ◽  
pp. 277-298 ◽  
Author(s):  
M. Kormos ◽  
G. Takács
Keyword(s):  
Finite Volume ◽  
Form Factors ◽  
Boundary Form
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