K+N scattering in the constituent quark model

Bender, I.; Dosch, H. G.; Pirner, Hans J.; Kruse, Hanno

doi:10.1016/0375-9474(84)90608-0

Cited by 52 publications

(20 citation statements)

References 24 publications

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“…We verify that the multiquarks computed with the Hamiltonian (1) are too heavy to explain the Θ + resonance, except for the I = 0, J P = 1/2 + state. We then apply the RGM to show that the exotic N − K hard core s-wave interaction is repulsive [11,12]. The result is consistent with the experimental data [13], see Fig.…”

supporting

confidence: 75%

Θ+(1540)as a heptaquark with the overlap of a pion, a kaon, and a nucleon

Bicudo¹,

Marques²

2004

Phys. Rev. D

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We study the very recently discovered Θ + (1540) at SPring-8, at ITEP and at CLAS-Thomas Jefferson Lab. We apply the same RGM techniques that already explained with success the repulsive hard core of nucleon-nucleon, kaon-nucleon exotic scattering, and the attractive hard core present in pion-nucleon and pion-pion non-exotic scattering. We find that the K − N repulsion excludes the Θ + as a K − N s-wave pentaquark. We explore the Θ + as a heptaquark, equivalent to a N + π + K borromean bound-state, with positive parity and total isospin I = 0. We find that the kaon-nucleon repulsion is cancelled by the attraction existing both in the pion-nucleon and pion-kaon channels. Although we are not yet able to bind the total three body system, we find that the Θ + may still be a heptaquark state. We conclude with predictions that can be tested experimentally.

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supporting

confidence: 75%

Θ+(1540)as a heptaquark with the overlap of a pion, a kaon, and a nucleon

Bicudo¹,

Marques²

2004

Phys. Rev. D

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“…The average of the two independent results is taken to describe the process The relationship of the Born series for elastic scattering to the resonating group method or the generator coordinate method [40] was detailed by Barnes and Swanson [16,41].…”

Section: Discussionmentioning

confidence: 99%

Cross sections for meson–meson nonresonant reactions

2007

Nuclear Physics A

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Meson-meson nonresonant reactions governed by the quark-interchange mechanism are studied in a potential that is derived from QCD. S-wave elastic phase shifts for I = 2 ππ and I = 3/2 Kπ scattering are obtained with wave functions determined by the central spin-independent term of the potential. The reactions include inelastic scatterings of two mesons in the ground-state pseudoscalar octet and the ground-state vector nonet. Cross sections for reactions involving π, ρ, K and K * indicate that mesonic interactions in matter consisting of only K and K * can be stronger than mesonic interactions in matter consisting of only π and ρ and the reaction of I = 3/2 πK * → ρK is most important among the endothermic nonresonant reactions. By the quark-interchange mechanism we can offer √ s-dependences of φ absorption cross sections in collisions with π and ρ and relevant average cross sections what are very small for the reaction of I = 1 πφ → K * K * and remarkably large for the reaction of I = 1 ρφ → K * K * . It is found from the √ s-dependences of cross sections that ρ and K * creation cross sections can be larger than their absorption cross sections, respectively.

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“…[42] for the independent ladder pair transverse density (see also Refs. [44][45][46]). In this model, the proton contains three clumps of parton density which can be thought of as the three gluon clouds surrounding the valence quarks, and F (b) given by:…”

Section: Sketch Of the Formalismmentioning

confidence: 99%

Conventional versus single-ladder-splitting contributions to double parton scattering production of two quarkonia, two Higgs bosons, andcc¯cc¯

2014

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The double parton distributions (dPDF), both conventional and those corresponding to parton splitting, are calculated and compared for different two-parton combinations. The conventional and splitting dPDFs have very similar shape in x 1 and x 2 . We make a first quantitative evaluation of the single-ladder-splitting contribution to double parton scattering (DPS) production of two S-or Pwave quarkonia, two Higgs bosons and cccc. The ratio of the single-ladder-splitting to conventional contributions is discussed as a function of centre-of-mass energy, mass of the produced system and other kinematical variables. Using a simple model for the dependence of the conventional twoparton distribution on transverse parton separation (Gaussian and independent of x i and scales), we find that the 2v1 contribution is as big as the 2v2 contribution discussed in recent years in the literature. This means that the phenomenological analyses of σ ef f including only the conventional DPS mechanism have to be revised including explicitly the single-ladder-splitting contributions discussed here. The differential distributions in rapidity and transverse momenta calculated for conventional and single-ladder-splitting DPS processes are however very similar which causes their experimental separation to be rather difficult, if not impossible. The direct consequence of the existence of the two components (conventional and splitting) is the energy and process dependence of the empirical parameter σ ef f . This is illustrated in our paper for the considered processes.

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K+N scattering in the constituent quark model

Cited by 52 publications

References 24 publications

Θ+(1540)as a heptaquark with the overlap of a pion, a kaon, and a nucleon

Θ+(1540)as a heptaquark with the overlap of a pion, a kaon, and a nucleon

Cross sections for meson–meson nonresonant reactions

Conventional versus single-ladder-splitting contributions to double parton scattering production of two quarkonia, two Higgs bosons, andcc¯cc¯

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