English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We study kaonic hydrogen, the bound K^-p state A_(Kp). Within a quantum fieldtheoretic and relativistic covariant approach we derive the energy leveldisplacement of the ground state of kaonic hydrogen in terms of the amplitudeof K^-p scattering for arbitrary relative momenta. The amplitude of low-energyK^-p scattering near threshold is defined by the contributions of threeresonances Lambda(1405), Lambda(1800) and Sigma^0(1750) and a smooth elasticbackground. The amplitudes of inelastic channels of low-energy K^-p scatteringfit experimental data on near threshold behaviour of the cross sections and theexperimental data by the DEAR Collaboration. We use the soft-pion technique(leading order in Chiral Perturbation Theory) for the calculation of thepartial width of the radiative decay of pionic hydrogen A_(pi p) -> n + gammaand the Panofsky ratio. The theoretical prediction for the Panofsky ratioagrees well with experimental data. We apply the soft-kaon technique (leadingorder in Chiral Perturbation Theory) to the calculation of the partial widthsof radiative decays of kaonic hydrogen A_(Kp) -> Lambda^0 + gamma and A_(Kp) ->Sigma^0 + gamma. We show that the contribution of these decays to the width ofthe energy level of the ground state of kaonic hydrogen is less than 1%.Comment: 33 pages, 1 figure, latex, References are adde

On kaonic hydrogen. Quantum field theoretic and relativistic covariant approach