PHENOMENOLOGICAL $\bar KN$ INTERACTION WITH ISOSPIN-BREAKING EFFECTS AND $\bar KNN$ SYSTEM

New isospin mixing [Formula: see text] potential directly reproducing 1s level shift of kaonic hydrogen atom and other experimental data was constructed. Two forms of the potential reproducing one- and two-pole structure of Λ(1405) resonance were used. Accurate K-p scattering length was calculated using the obtained potentials.

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Lessons from Fitting the Lowest Order Energy Independent Chiral Based $$\bar{K}N$$ Potential to Experimental Data

Few-Body Systems ◽

10.1007/s00601-020-01565-1 ◽

2020 ◽

Vol 61 (4) ◽

Author(s):

J. Révai

Keyword(s):

Experimental Data ◽

Cross Sections ◽

Interaction Model ◽

Bound State ◽

Level Shift ◽

Kaonic Hydrogen ◽

Multichannel System ◽

The Right ◽

Insight Into ◽

Quasi Bound State

AbstractIt is shown, that fitting parameters of a $$\bar{K}N$$ K ¯ N interaction model to different sets of experimental data can lead to physical conclusions which might provide a deeper insight into the physics of this multichannel system. The available experimental data are divided into three parts: the “classical” set consisting of the low-energy $$K^-p$$ K - p cross sections and the threshold branching ratios, the SIDDHARTA 1s level shift in kaonic hydrogen and the CLAS photoproduction data. We have fitted the parameters of the potential to different combinations of these data. We found, that the two poles corresponding to the $$I=0$$ I = 0 nuclear quasi-bound state $$(\Lambda (1405))$$ ( Λ ( 1405 ) ) and to the $$K^-p$$ K - p 1s atomic level seem to resist to their simultaneous reproduction at the right place, though a more or less satisfactory compromise can be achieved. Potentials with the $$\Lambda (1405)$$ Λ ( 1405 ) pole pinned down close to the PDG value fail to reproduce the classical two-body data with an acceptable accuracy. We also added comments on two papers criticizing the potential used in the fits.

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COUPLED-CHANNELS FADDEEV CALCULATION OF THE K-d SCATTERING LENGTH

International Journal of Modern Physics A ◽

10.1142/s0217751x11052025 ◽

2011 ◽

Vol 26 (03n04) ◽

pp. 558-560

Author(s):

NINA V. SHEVCHENKO

Keyword(s):

Experimental Data ◽

Scattering Length ◽

Faddeev Calculation ◽

Level Shift ◽

Faddeev Equations ◽

Interaction Models ◽

Coupled Channels ◽

Atom Level ◽

Text Interaction

We investigated the dependence of the K-d scattering length on two models of [Formula: see text] interaction, providing one or two poles for the Λ(1405) resonance. The [Formula: see text] system is described by coupled-channels Faddeev equations in AGS form. The two-body [Formula: see text] interaction models reproduce all existing experimental data on K-p scattering and K-p atom level shift. The comparison with several approximations, commonly used for such calculations, was done.

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The structure and energetics of low-lying states of RCO and RNN free radicals

Canadian Journal of Chemistry ◽

10.1139/v77-120 ◽

1977 ◽

Vol 55 (5) ◽

pp. 863-868 ◽

Cited By ~ 20

Author(s):

N. Colin Baird ◽

Harish B. Kathpal

Keyword(s):

Experimental Data ◽

Free Radicals ◽

Hydrogen Atom ◽

Ab Initio ◽

Open Shell ◽

Basis Set ◽

Basis Sets ◽

Mo Calculations ◽

Decomposition Products ◽

Ab Initio Mo Calculations

The important geometrical variables in the structures of the lowest 2A′ and 2A′′ states of the free radicals HCO, CH3CO, NH2CO, HNN, and CH3NN have been determined by ab initio MO calculations using the STO-3G basis set. The energy differences between the states, and the energies of the radicals relative to their decomposition products and relative to their hydrogen atom addition products, are reported using both STO-3G and 4-31G basis sets in the restricted open-shell calculations. The trends in these results and their relation to available experimental data are discussed.

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Kaonic deuterium from realistic antikaon-nucleon interaction

EPJ Web of Conferences ◽

10.1051/epjconf/201919903003 ◽

2019 ◽

Vol 199 ◽

pp. 03003

Author(s):

Wataru Horiuchi ◽

Tetsuo Hyodo ◽

Wolfram Weise

Keyword(s):

Precise Measurement ◽

Basis Functions ◽

Accurate Estimation ◽

Level Shift ◽

Kaonic Hydrogen ◽

Threshold Region ◽

Nucleon Interaction ◽

Kaonic Deuterium ◽

Gaussian Basis Functions ◽

Three Body

We present precise three-body calculations for the spectrum of kaonic deuterium with a realistic antikaon-nucleon interaction. Thanks to the precise measurement of kaonic hydrogen, it is now possible to construct realistic $\bar KN$ interactions which reproduce the whole set of experimental data in the threshold region. Employing such realistic interactions, the energy of the three-body system of kaonic deuterium is determined with the accuracy of eV, by expanding its wave function with a large number of correlated Gaussian basis functions. The level shift and width of the 1S state are found to be 670 eV and 1016 eV, respectively. The improved Deser formulas work reasonably well to estimate the shift and width of kaonic hydrogen, but their application to kaonic deuterium does not give an accurate estimation. It is shown that the result is sensitive to the I = 1 component of the $\bar KN$ interaction, which will be further constrained in future experiments.

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Estimate of theσKN(I=1)(0)-term value from the energy-level shift of kaonic hydrogen in the ground state

Physical Review A ◽

10.1103/physreva.73.032510 ◽

2006 ◽

Vol 73 (3) ◽

Cited By ~ 1

Author(s):

A. N. Ivanov ◽

M. Faber ◽

V. A. Ivanova ◽

J. Marton ◽

N. I. Troitskaya

Keyword(s):

Energy Level ◽

Ground State ◽

Level Shift ◽

Kaonic Hydrogen ◽

Energy Level Shift

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ISOSPIN BREAKING EFFECTS IN Kl3 AND THE DETERMINATION OF Vus

Modern Physics Letters A ◽

10.1142/s0217732390000858 ◽

1990 ◽

Vol 05 (10) ◽

pp. 755-762 ◽

Cited By ~ 5

Author(s):

G. LÓPEZ CASTRO ◽

G. ORDAZ HERNÁNDEZ

Keyword(s):

Experimental Data ◽

Isospin Breaking ◽

Breaking Effect ◽

Weighted Averages ◽

Vector Charge ◽

Weak Transition

We study the Kl3 decays and show that a large isospin breaking effect is present in experimental data of Kµ3. From the Kµ3 and Ke3 rates, we determine the following weighted averages values: [Formula: see text][Formula: see text] with [Formula: see text] being the vector charge of the weak transition K→π.

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