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Showing 2003 · hep-phShow all

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hep-ph2003

Impact of saturation on s-channel helicity nonconservation for diffractive vector mesons

I. P. Ivanov, N. N. Nikolaev, W. Schäfer

As Glauber has shown in 1959, the spin-flip phenomena caused by the conventional spin-orbit interaction do vanish in the scattering off heavy, strongly absorbing nuclei. On the oth…

hep-ph2003★ 79 cited

Updated dispersion-theoretical analysis of the nucleon electromagnetic form factors

H. -W. Hammer, Ulf-G. Meißner

In the light of the new data on the various neutron and proton electromagnetic form factors taken in recent years, we update the dispersion-theoretical analysis of the nucleon elec…

hep-ph2003★ 55 cited

How to extract the scattering length from production reactions

A. Gasparyan, J. Haidenbauer, C. Hanhart +1

A dispersion integral is derived that allows one to relate directly (spin dependent) invariant mass spectra, measured in a large-momentum transfer reaction such as $pp\to K^+p…

hep-ph2003★ 202 cited

Meson production in nucleon--nucleon collisions close to the threshold

C. Hanhart

The last decade has witnessed great experimental progress that has led to measurements of cross sections--polarized as well as unpolarized--of of high accuracy in several $NN \to N…

hep-ph2003★ 5 cited

Relativistic five-quark equations and u, d- pentaquark spectroscopy

S. M. Gerasyuta, V. I. Kochkin

The relativistic five-quark equations are found in the framework of the dispersion relation technique. The five-quark amplitudes for the low-lying pentaquarks including u, d quarks…

hep-ph2003★ 44 cited

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…