Strange meson–nucleon states in the quark potential model

Abstract

The quark potential model and resonating group method are used to investigate the KN bound states and/or resonances. The model potential consists of the t-channel and s-channel one-gluon exchange potentials and the confining potential with incorporating the QCD renormalization correction and the spin-orbital suppression effect in it. It was shown in our previous work that by considering the color octet contribution, use of this model to investigate the KN low energy elastic scattering leads to the results which are in pretty good agreement with the experimental data. In this paper, the same model and method are employed to calculate the masses of the KN bound systems. For this purpose, the resonating group equation is transformed into a standard Schrödinger equation in which a nonlocal effective KN interaction potential is included. Solving the Schrödinger equation by the variational method, we are able to reproduce the masses of some currently concerned KN states and get a view that these states possibly exist as KN molecular states. For the KN system, the same calculation gives no support to the existence of the resonance Θ + (1540) which was announced recently.

Observation of Three-Quasiparticle Doublet Bands in 123 I: Possible Evidence of Chirality

“…In this Letter, we report an observation of a pair of bands, which show several experimental features consistent with expectations for chiral doublet bands, in an odd-proton nucleus 123 I. Previous total-routhian-surface (TRS) calculations [13] and experimental investigations [13,14,15] have shown that this nucleus, as well as the other iodine nuclei, is very 𝛾soft, which ensures the possible occurrence of triaxial deformation. Chiral doublet bands in the case of iodine isotopes have been proposed in the odd-odd 118 I.…”

“…The experimental procedure and off-line analysis methods have been described at length in our previous publications. [14,15] A partial level scheme of 123 I is shown in Fig. 1, where the band labeled 3 is a new band identified in the present work.…”

“…Band 3 comprises of two strongly coupled decay sequences and decays into the previously known band 2, to which we assigned the oblate 𝜋𝑔 7/2 [404]7/2 + configuration in our previous study. [14,15] Several links between band 3 and band 1, to which the 𝜋𝑔 7/2 (𝜈ℎ 11/2 ) 2 configuration was assigned, [14,15] have also been observed as shown in Fig. 1.…”

Near-Yrast Structures in Odd-Odd 122 I Nucleus

“…In contrast, the 𝜋ℎ 11/2 ⊗ 𝜈ℎ 11/2 band does not follow the trend of a well-developed rotational band; in particular an unusual decrease followed by an unusual increase in level spacing is seen from the suggested 𝐼 = 14 to 18 levels in the 𝛼 = 0 sequence and seen from 𝐼 = 13 to 17 levels in the 𝛼 = 1 sequence. Very similar variations are also seen around spin 𝐼 = 𝑗+6 = 11/2 + 6 = 23/2 in the 𝜋ℎ 11/2 band in 123 I [1] and the 𝜈ℎ 11/2 band in 121 Te [19] and around spin 𝐼 = 6 in the 𝑔-band of the neighboring even-even Te isotopes. [19] Based on total-Routhian-surface (TRS) calculations, such a feature has been attributed [19] to an occurrence of a non-collective 𝛾 ≈ +60 ∘ (𝜋𝑔 7/2 ) 2 state which contributes 6 angular momentum to the total nuclear spin.…”

Role of five-quark components in radiative and strong decays of theΛ(1405)resonance

“…The structure and properties of the S 01 resonance Λ(1405), discovered in 1960's, is still one of the puzzling issues in hadron physics. In the literature the Λ(1405) is considered as an s-channel resonance [1] or as a quasi-bound ( KN, Σπ) state [2][3][4][5][6][7][8][9][10][11][12][13]. In quark-model approaches, this hyperon is treated as a pure |qqq -state [14][15][16][17][18][19][20], or still as an admixture of |q 3 +q 4 q configuration [21,22].…”