<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mover accent="true"><mml:mrow><mml:mi>K</mml:mi></mml:mrow><mml:mrow><mml:mo>¯</mml:mo></mml:mrow></mml:mover><mml:mi mathvariant="italic">NN</mml:mi></mml:mrow></mml:math>quasibound state and the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mover accent="true"><mml:mrow><mml:mi>K</mml:mi></mml:mrow><mml:mrow><mml:mo>¯</mml:mo></mml:mrow></mml:mover><mml:mi>N</mml:mi></mml:mro

Шевченко, Н. В.; Gal, A.; Mareš, J.; Révai, J.

doi:10.1103/physrevc.76.044004

Cited by 213 publications

(196 citation statements)

References 44 publications

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“…It must, however, be stressed that the strong mass dependence which is apparent in Fig. 10 does not necessarily imply that the K − forms a bound state with the two protons [20,21,22].…”

Section: The Kaon-proton-proton Invariant-mass Distributionmentioning

confidence: 99%

Kaon pair production in proton-proton collisions

Maeda¹,

Hartmann²,

Keshelashvili³

et al. 2008

Phys. Rev. C

105

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The differential and total cross sections for kaon pair production in the pp → ppK + K − reaction have been measured at three beam energies of 2.65, 2.70, and 2.83 GeV using the ANKE magnetic spectrometer at the COSY-Jülich accelerator. These near-threshold data are separated into pairs arising from the decay of the φ-meson and the remainder. For the non-φ selection, the ratio of the differential cross sections in terms of the K − p and K + p invariant masses is strongly peaked towards low masses. This effect can be described quantitatively by using a simple ansatz for the K − p final state interaction, where it is seen that the data are sensitive to the magnitude of an effective K − p scattering length. When allowance is made for a small number of φ events where the K − rescatters from the proton, the φ region is equally well described at all three energies. A very similar phenomenon is discovered in the ratio of the cross sections as functions of the K − pp and K + pp invariant masses and the identical final state interaction model is also very successful here. The world data on the energy dependence of the non-φ total cross section is also reproduced, except possibly for the results closest to threshold.

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“…It must, however, be stressed that the strong mass dependence which is apparent in Fig. 10 does not necessarily imply that the K − forms a bound state with the two protons [20,21,22].…”

Section: The Kaon-proton-proton Invariant-mass Distributionmentioning

confidence: 99%

Kaon pair production in proton-proton collisions

Maeda¹,

Hartmann²,

Keshelashvili³

et al. 2008

Phys. Rev. C

105

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“…This analysis was strongly criticized [34] due to the unrealistic treatment of theKN interaction. Recent improved calculations using different few-body methods with diverseKN input [35][36][37][38][39][40][41][42][43][44] predict few-nucleon kaonic states with large widths, although the predicted binding energies and widths differ substantially from one model to the other. Thus, the experimental quest for such deeply bound kaonic states is an active field of research [45][46][47][48][49][50][51], that will allow to further constrain thē KN interaction in the near future.…”

Section: Introductionmentioning

confidence: 99%

Antistrange meson-baryon interaction in hot and dense nuclear matter

et al. 2014

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We present a study of in-medium cross sections and (off-shell) transition rates for the most relevant binary reactions for strange pseudoscalar meson production close to threshold in heavy-ion collisions at FAIR energies. Our results rely on a chiral unitary approach in coupled channels which incorporates the s-and p-waves of the kaonnucleon interaction. The formalism, which is modified in the hot and dense medium to account for Pauli blocking effects, mean-field binding on baryons, and pion and kaon self-energies, has been improved to implement unitarization and self-consistency for both the s-and p-wave interactions at finite temperature and density. This gives access to in-medium amplitudes in several elastic and inelastic coupled channels with strangeness content S = −1. The obtained total cross sections mostly reflect the fate of the Λ(1405) resonance, which melts in the nuclear environment, whereas the off-shell transition probabilities are also sensitive to the in-medium properties of the hyperons excited in the p-wave amplitudes [Λ, Σ and Σ * (1385)]. The single-particle potentials of these hyperons at finite momentum, density and temperature are also discussed in connection with the pertinent scattering amplitudes. Our results are the basis for future implementations in microscopic transport approaches accounting for off-shell dynamics of strangeness production in nucleus-nucleus collisions.

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“…In a further paper, the same group quantifies the uncertainties and evaluates the extra width coming fromK absorption from the pair of nucleons, with the results of B=20-40 MeV and Γ as large as 100 MeV with admitted large uncertainties [15] . Coupled channel three body calculations of the quasi boundKN N system were investigated in [16,17] using Faddeev equations, and their results for the binding is 50-70 MeV and the width around 100 MeV. The work of [18] studied three body resonances in theKN N system within a framework of theKN N → πY N coupled channel Faddeev equation.…”

Section: Introductionmentioning

confidence: 99%

K¯NNabsorption within the framework of the fixed-center approximation to Faddeev equations

Bayar

Oset

2013

Phys. Rev. C

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We present a method to evaluate theK absorption width in the boundKN N system. Most calculations of this system ignore this channel and only consider theKN → πΣ conversion. Other works make a qualitative calculation using perturbative methods. Since the Λ(1405) resonance is playing a role in the process, the same resonance is changed by the presence of the absorption channels and we find that a full nonperturbative calculation is called for, which we present here. We employ the Fixed Center Approximation to Faddeev equations to account forK rescattering on the (N N ) cluster and we find that the width of the states found previously for S = 0 and S = 1 increases by about 30 MeV due to theKN N absorption, to a total width of about 80 MeV.

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K¯NNquasibound state and theK¯N

Cited by 213 publications

References 44 publications

Kaon pair production in proton-proton collisions

Kaon pair production in proton-proton collisions

Antistrange meson-baryon interaction in hot and dense nuclear matter

K¯NNabsorption within the framework of the fixed-center approximation to Faddeev equations

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