Role of correlated two-pion exchange in K+N scattering

Hoffmann, M.; Durso, J.W.; Holinde, K.; Pearce, B.C.; Speth, J.

doi:10.1016/0375-9474(95)00320-z

Cited by 42 publications

(109 citation statements)

References 23 publications

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“…Results for phase shifts and also for cross sections and polarizations can be found, e.g., in Ref. [11]. Evidently this model yields a good overall reproduction of all presently available empirical information on KN scattering.…”

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confidence: 52%

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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: 52%

“…[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].…”

Section: Introductionmentioning

confidence: 99%

Influence of aZ+(1540)resonance onK+Nscattering

Haidenbauer

Krein

2003

Phys. Rev. C

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“…In order to describe the K þ interaction with nucleons more accurately, we modified the GENIE code to implement elastic scattering and charge exchange reactions calculated using the data-driven cross sections from partialwave analysis [16,17]. The K þ loss probability due to charge exchange is calculated to be only 2.1%.…”

Section: Simulationmentioning

confidence: 99%

“…Extensions of the Standard Model (SM) of particle physics, such as supersymmetric grand unified theories (SUSY-GUTs) [1,2], predict that the three SM coupling constants are unified at a scale of ∼2 × 10 16 GeV. Proton decay is an indispensable probe to determine the unification scale experimentally.…”

Section: Introductionmentioning

confidence: 99%

Search for the proton decay modep→ν¯K+with KamLAND

Asakura¹,

Gando²,

Gando³

et al. 2015

Phys. Rev. D

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We present a search for the proton decay mode p →νK þ based on an exposure of 8.97 kton-years in the KamLAND experiment. The liquid scintillator detector is sensitive to successive signals from p →νK þ with unique kinematics, which allow us to achieve a detection efficiency of 44%, higher than previous searches in water Cherenkov detectors. We find no evidence of proton decays for this mode. The expected background, which is dominated by atmospheric neutrinos, is 0.9 AE 0.2 events. The nonbackgroundsubtracted limit on the partial proton lifetime is τ=Bðp →νK þ Þ > 5.4 × 10

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“…For example, in the case of the K + N reaction, quark interchange accounts only for part of the experimental s-wave phase shifts and σ, ω and ρ meson exchanges are crucial for describing this wave as well as higher partial waves [11]. It is important also to add that meson-baryon dynamics alone [12,13] seems not to be sufficient to describe the experimental K + N data. With these facts in mind, Ref.…”

Section: -P4mentioning

confidence: 99%

Study of the $\bar{D}$NInteraction in a QCD Coulomb Gauge Quark Model

Fontoura

Krein

Vizcarra

2010

EPJ Web of Conferences

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Abstract. We study theDN interaction at low energies with a quark model inspired in the QCD Hamiltonian in Coulomb gauge. The model Hamiltonian incorporates a confining Coulomb potential extracted from a self-consistent quasiparticle method for the gluon degrees of freedom, and transverse-gluon hyperfine interaction consistent with a finite gluon propagator in the infrared. Initially a constituent-quark mass function is obtained by solving a gap equation and baryon and meson bound-states are obtained in Fock space using a variational calculation. Next, having obtained the constituent-quark masses and the hadron waves functions, an effective meson-nucleon interaction is derived from a quark-interchange mechanism. This leads to a short range mesonbaryon interaction and to describe long-distance physics vector-and scalar-meson exchanges described by effective Lagrangians are incorporated. The derived effectiveDN potential is used in a Lippmann-Schwinger equation to obtain phase shifts. The results are compared with a recent similar calculation using the nonrelativistic quark model.

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Role of correlated two-pion exchange in K+N scattering

Cited by 42 publications

References 23 publications

Influence of aZ+(1540)resonance onK+Nscattering

Influence of aZ+(1540)resonance onK+Nscattering

Search for the proton decay modep→ν¯K+with KamLAND

Study of the $\bar{D}$NInteraction in a QCD Coulomb Gauge Quark Model

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