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hep-ph2006★ 51 cited
On the strong energy dependence of the e^+e^- to ppbar amplitude near threshold
J. Haidenbauer, H. -W. Hammer, Ulf-G. Meißner +1
We study the energy dependence of the e^+e^- to ppbar cross section close to the two-nucleon threshold, recently reported by the BaBar collaboration. Our analysis also includes the…
hep-ph2003
On the pion cloud of the nucleon
H. -W. Hammer, D. Drechsel, Ulf-G. Meißner
We evaluate the two--pion contribution to the nucleon electromagnetic form factors by use of dispersion analysis and chiral perturbation theory. After subtraction of the rho--meson…