Structures in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>K</mml:mi></mml:mrow><mml:mrow><mml:mo>±</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>-Nucleon Total Cross Sections between 0.9 and 2.4 GeV/<i>c</i>

Cool, R. L.; Giacomelli, G.; Kycia, T. F.; Leontić, Boran; Li, K.K.; Lundby, A.; Teiger, J.; Wilkin, C.

doi:10.1103/physrevd.1.1887

Cited by 50 publications

(20 citation statements)

References 52 publications

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“…2 together with the results of the original Jülich model I and the available experimental information [17][18][19][20]. The I = 1 channel is shown here only to demonstrate the quality of the Jülich model.…”

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confidence: 91%

Influence of aZ+(1540)resonance onK+Nscattering

Haidenbauer

Krein

2003

Phys. Rev. C

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The impact of a (I = 0, J P = 1 2 + ) Z + (1540) resonance with a width of 5MeV or more on the K + N (I=0) elastic cross section and on the P 01 phase shift is examined within the KN meson-exchange model of the Jülich group. It is shown that the rather strong enhancement of the cross section caused by the presence of a Z + with the above properties is not compatible with the existing empirical information on KN scattering. Only a much narrower Z + state could be reconciled with the existing data -or, alternatively, the Z + state must lie at an energy much closer to the KN threshold.PACS NUMBERS: 13.75. Jz, 12.39.Pn, 14.20.Jn,12.40.-y KEYWORDS: Pentaquark, Strangeness, Meson-exchange Models 1 Recently the LEPS collaboration at Spring-8 presented evidence for the existence of a narrow baryon resonance with strangeness S = +1 [1]. In the following four other collaborations from different laboratories announced the observation of a similar structure in their experiments [2][3][4][5]. The observed structure was immediately brought into connection with an exotic pentaquark state called Z + whose existence had been proposed since long time in the context of different quark models 1 . Specifically, the resonance parameters with a peak position around 1540 MeV and a width around 20 MeV, extracted from these experiments, lie convincingly close to a theoretical prediction based on the chiral quark-soliton model of Diakonov et al. [6], who had proposed the existence of a Z + state with a mass around 1530 MeV and a width of around 15 MeV. Due to its quantum numbers, S = +1, I = 0, and J P = In the present note we use the Jülich meson-exchange model for the KN interaction to investigate the effect of including in the model a Z + -like resonance structure on the description of the experimental data. Within a realistic potential model the open parameters are fixed by a simultaneous fit to all KN partial waves and therefore the contributions to the P 01 channel (we use the standard spectral notation L I 2J ), which provide the background for the Z + (1540) resonance, are strongly constrained by the empirical information in the other partial waves and that means also from the other isospin channel. Furthermore, the use of a model allows one to produce a resonance structure from a bare pole interaction by dressing the bare baryon-meson vertex, with a width generated from self-energy loops, i.e. the non-pole and the pole part of the reaction amplitude can be treated consistently.A detailed description of the Jülich KN model can be found in Refs. [10,11]. The model was constructed along the lines of the (full) Bonn NN model [12] and its extension to the hyperon-nucleon (Y N) system [13]. Specifically, this means that one has used the same scheme (time-ordered perturbation theory), the same type of processes, and vertex parameters (coupling constants, cut-off masses of the vertex form-factors) fixed already by the study of these other reactions.1 We follow the historical nomenclature adopted in the particle data tables. More ...

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confidence: 91%

Influence of aZ+(1540)resonance onK+Nscattering

Haidenbauer

Krein

2003

Phys. Rev. C

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“…Much of these data are available from compilations [30,31,32] but we try to give references to the original data as much as possible [33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53].…”

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confidence: 99%

Partial-wave analysis ofK+-nucleon scattering

Gibbs

Arceo

2007

Phys. Rev. C

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We have performed a partial-wave analysis of K + -nucleon scattering in the momentum range from 0 to 1.5 GeV/c addressing the uncertainties of the results and comparing them with several previous analyses. It is found that the treatment of the reaction threshold behavior is particularly important. We find a T=0 scattering length which is not consistent with zero, as has been claimed by other analyses. The T=0 phase shifts for ℓ > 0 are consistent with a pure spin-orbit potential. Some indications for the production of a T=0 pentaquark with spin-parity D5/2+ are discussed.

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“…This is the elementary process that is needed for analyzing the reaction K + Xe→K 0 pX measured by the DIANA collaboration. Obviously, here the characteristic (filled circles), [10] (squares), [11] (open circles), and [12] (crosses).…”

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confidence: 99%

Analysis of Θproduction in K+- Xe collisions

et al. 2005

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Abstract. The reaction K + Xe→K 0 pX is investigated in a meson-exchange model including rescattering of the secondary protons with the aim to analyze the evidence for the Θ + (1540) resonance reported by the DIANA collaboration. We confirm that the kinematical cuts introduced by the DIANA collaboration efficiently suppress the background to the K + n → K 0 p reaction which may contribute to the Θ + (1540) production. We find that these kinematical cuts do not produce a narrow structure in the K 0 p effective mass spectra near 1540 MeV. We study the effect of a narrow Θ + resonance of both positive and negative parity in comparison with the DIANA data. We show that the K + Xe→K 0 pX calculations without Θ + contribution as well as the results obtained with a Θ + width of 1 MeV are in comparably good agreement with the DIANA results. More dedicated experiments are called for to establish this exotic baryon resonance.

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Structures inK±-Nucleon Total Cross Sections between 0.9 and 2.4 GeV/c

Cited by 50 publications

References 52 publications

Influence of aZ+(1540)resonance onK+Nscattering

Influence of aZ+(1540)resonance onK+Nscattering

Partial-wave analysis ofK+-nucleon scattering

Analysis of Θproduction in K+- Xe collisions

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