Author
Johann Haidenbauer
Other affiliations: Joint Institute for Nuclear Research
Bio: Johann Haidenbauer is an academic researcher from Forschungszentrum Jülich. The author has contributed to research in topics: Meson & Nucleon. The author has an hindex of 45, co-authored 260 publications receiving 6296 citations. Previous affiliations of Johann Haidenbauer include Joint Institute for Nuclear Research.
Topics: Meson, Nucleon, Effective field theory, Baryon, Pion
Papers published on a yearly basis
Papers
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TL;DR: In this article, the authors generalize a model-independent approach of Weinberg to the case of unstable particles and apply it to the a 0 (980) and f 0(980) resonances and address the question whether these particles are predominantly genuine, confined quark states or governed by mesonic components.
340 citations
TL;DR: In this paper, the results for the ΛN and ΣN interactions obtained at next-to-leading order in chiral effective field theory are reported, at the order considered there are contributions from one-and two-pseudoscalar-meson exchange diagrams and from four-baryon contact terms without and with two derivatives.
257 citations
TL;DR: In this paper, the leading order hyperon-nucleon potential in chiral effective field theory was constructed, and a good description of the available data was given, and discussed briefly further improvements of this scheme.
197 citations
TL;DR: In this paper, a one-boson-exchange model for the hyperon-nucleon (Lambda N, Sigma N) interaction is presented, which incorporates the standard one boson exchanges of the lowest pseudoscalar and vector meson multiplets with coupling constants fixed by SU(6) flavor symmetry relations.
Abstract: A one-boson-exchange model for the hyperon-nucleon (\Lambda N, \Sigma N) interaction is presented. The model incorporates the standard one boson exchanges of the lowest pseudoscalar and vector meson multiplets with coupling constants fixed by SU(6) flavor symmetry relations. As the main new feature of the model, the contributions in the scalar--isoscalar (\sigma) and vector--isovector (\rho) exchange channels are now constrained by a microscopic model of correlated \pi\pi and K \bar K exchange. Additional short-ranged ingredients of the model in the scalar--isovector (a_0) and scalar--isospin-1/2 (\kappa) channels are likewise viewed as arising from meson-meson correlations but are treated phenomenologically. With this model a satisfactory reproduction of the available hyperon-nucleon data can be achieved.
166 citations
TL;DR: In this paper, the meson-baryon interaction in the different channels is described simultaneously in an analytic, unitary, coupled-channel approach using SU(3) flavor symmetry.
Abstract: Elastic πN scattering and the world data of the family of reactions π
−
p → ηn, K
0
Λ, K
0
Σ
0, K
+
Σ
−, and π
+
p → K
+
Σ
+ are described simultaneously in an analytic, unitary, coupled-channel approach. SU(3) flavor symmetry is used to relate both the t - and the u - channel exchanges that drive the meson-baryon interaction in the different channels. Angular distributions, polarizations, and spin-rotation parameters are compared with available experimental data. Partial-wave amplitudes are determined and the resonance content is extracted from the analytic continuation, including resonance positions and branching ratios, and possible sources of uncertainties are discussed. The results provide the final-state interactions for the ongoing analysis of photo- and electroproduction data.
134 citations
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TL;DR: There is, I think, something ethereal about i —the square root of minus one, which seems an odd beast at that time—an intruder hovering on the edge of reality.
Abstract: There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality.
Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …
33,785 citations
Journal Article•
28,685 citations
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TL;DR: In this paper, a sedimentological core and petrographic characterisation of samples from eleven boreholes from the Lower Carboniferous of Bowland Basin (Northwest England) is presented.
Abstract: Deposits of clastic carbonate-dominated (calciclastic) sedimentary slope systems in the rock record have been identified mostly as linearly-consistent carbonate apron deposits, even though most ancient clastic carbonate slope deposits fit the submarine fan systems better. Calciclastic submarine fans are consequently rarely described and are poorly understood. Subsequently, very little is known especially in mud-dominated calciclastic submarine fan systems. Presented in this study are a sedimentological core and petrographic characterisation of samples from eleven boreholes from the Lower Carboniferous of Bowland Basin (Northwest England) that reveals a >250 m thick calciturbidite complex deposited in a calciclastic submarine fan setting. Seven facies are recognised from core and thin section characterisation and are grouped into three carbonate turbidite sequences. They include: 1) Calciturbidites, comprising mostly of highto low-density, wavy-laminated bioclast-rich facies; 2) low-density densite mudstones which are characterised by planar laminated and unlaminated muddominated facies; and 3) Calcidebrites which are muddy or hyper-concentrated debrisflow deposits occurring as poorly-sorted, chaotic, mud-supported floatstones. These
9,929 citations
1,969 citations
TL;DR: In this article, the nuclear forces can be derived using effective chiral Lagrangians consistent with the symmetries of QCD, and the status of the calculations for two and three nucleon forces and their applications in few-nucleon systems are reviewed.
Abstract: Nuclear forces can be systematically derived using effective chiral Lagrangians consistent with the symmetries of QCD. I review the status of the calculations for two- and three-nucleon forces and their applications in few-nucleon systems. I also address issues like the quark mass dependence of the nuclear forces and resonance saturation for four-nucleon operators.
1,455 citations