TY  - JOUR
AU  - Alarcon, J. M.
AU  - Hiller Blin, A. N.
AU  - Vicente Vacas, M. J.
AU  - Weiss, C.
PY  - 2017
DA  - 2017//
TI  - Peripheral transverse densities of the baryon octet from chiral effective field theory and dispersion analysis
T2  - Nucl. Phys. A
JO  - Nuclear Physics A
SP  - 18
EP  - 54
VL  - 964
PB  - Elsevier Science Bv
KW  - Electromagnetic form factors
KW  - Chiral lagrangians
KW  - Dispersion relations
KW  - Hyperons
KW  - Charge distribution
AB  - The baryon electromagnetic form factors are expressed in terms of two-dimensional densities describing the distribution of charge and magnetization in transverse space at fixed light-front time. We calculate the transverse densities of the spin-1/2 flavor-octet baryons at peripheral distances b = O(M-pi(-1)) using methods of relativistic chiral effective field theory (chi EFT) and dispersion analysis. The densities are represented as dispersive integrals over the imaginary parts of the form factors in the timelike region (spectral functions). The isovector spectral functions on the two-pion cut t > 4 M-pi(2) are calculated using relativistic chi EFT including octet and decuplet baryons. The chi EFT calculations are extended into the rho meson mass region using an N / D method that incorporates the pion electromagnetic form factor data. The isoscalar spectral functions are modeled by vector meson poles. We compute the peripheral charge and magnetization densities in the octet baryon states, estimate the uncertainties, and determine the quark flavor decomposition. The approach can be extended to baryon form factors of other operators and the moments of generalized parton distributions.
SN  - 0375-9474
UR  - http://arxiv.org/abs/1703.04534
UR  - https://doi.org/10.1016/j.nuclphysa.2017.05.002
DO  - 10.1016/j.nuclphysa.2017.05.002
LA  - English
N1  - WOS:000404199900002
ID  - Alarcon_etal2017
ER  -