arXiv subjects

V. V. Abaev

Publications and source records attributed to V. V. Abaev.

2 recordsLinked to original sources

arXiv2018

Charge splitting in $πNΔ$ formfactor

Experimental data on $πN $ scattering in the elastic energy region $W \leq 1.45 GeV $ are analyzed within the $K$-matrix approach with effective Lagrangians. The charge splitting in $δ^{++}_{33} $ and $δ^{0}_{33}$ phases obtaned in the phase shift analisys is studed . It is shown that the change in the sign in the energy dependence of the phase difference can be obtained with different formfactors of the $Δ^{++}$ and $Δ^{0}$ only . This means that $Δ^{++}$ and $Δ^{0}$ has a different size in $πN $ interaction.The underlying nature of the observed phenomena is discussed.

hep-ph↗

arXiv2007

The Goldberger-Miyazawa-Oehme sum rule revisited

The Goldberger-Miyazawa-Oehme sum rule is used to extract the pion-nucleon coupling constant from experimental $π$N information. Chiral perturbation theory is exploited in relating the pionic hydrogen s-wave level shift and width results to the appropriate scattering lengths. The deduced value for the coupling is $f^2 = 0.075 \pm 0.002$, where the largest source of uncertainty is the determination of the s-wave $π^- p$ scattering length from the atomic level shift measurement.

hep-ph↗