On the estimate of the σ (I=1) KN (0)-term value from the energy level shift of kaonic hydrogen in the ground state
AbstractUsing the experimental data on the energy level shift of kaonic hydrogen in the ground state (the DEAR Collaboration, Phys. Rev. Lett. 94, 212302 (2005)) and the theoretical value of the energy level shift, calculated within the phenomenological quantum field theoretic approach to the description of strong low-energyKN and KN N interactions developed at Stefan Meyer Institut für subatomare Physik in Vienna, we estimate the value of the σ (I=1) KN (0)-term of low-energyKN scattering. We get σ (I=1) KN (0) = (433 ± 85) MeV. This testifies the absence of strange quarks in the proton structure.
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