Meson-Baryon Couplings in a Quark Model

Mitra, A. N.; Ross, M.

doi:10.1103/physrev.158.1630

Cited by 135 publications

(30 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The simplest ansatz for the decay operator is furnished by the elementary emission model (EEM) [13][14][15]. Therein a pointlike meson is produced by a single constituent quark in the decaying baryon state.…”

Section: B Oge Constituent Quark Modelmentioning

confidence: 99%

Hadronic decays of N and Δ resonances in a chiral quark model

et al. 2001

View full text Add to dashboard Cite

π and η decay modes of light baryon resonances are investigated within a chiral quark model whose hyperfine interaction is based on Goldstone-boson exchange. For the decay mechanism a modified version of the 3 P0 model is employed. Our primary aim is to provide a further test of the recently proposed Goldstone-boson-exchange constituent quark model. We compare the predictions for π and η decay widths with experiment and also with results from a traditional one-gluon-exchange constituent quark model. The differences between nonrelativistic and semirelativistic versions of the constituent quark models are outlined. We also discuss the sensitivity of the results on the parametrization of the meson wave function entering the 3 P0 model.

show abstract

Section: B Oge Constituent Quark Modelmentioning

confidence: 99%

Hadronic decays of N and Δ resonances in a chiral quark model

et al. 2001

View full text Add to dashboard Cite

show abstract

“…There exists an older study of strange resonance decays [5] but the corresponding results are mainly of a qualitative nature. More recently, since the advent of CQMs, there have only been a few investigations of strong decays in the strange sector [9,18,19,28].…”

Section: Introductionmentioning

confidence: 99%

“…This is unfortunate, not only in view of the vast amount of experimental data but also because the decay properties of hadron resonances give important insights into strong interaction physics (see, for example, the recent NSTAR workshops [1,2,3]). Investigations of strong decay processes date back to the late 1960s [4,5,6,7,8], and with the refinement of constituent quark models (CQMs) various aspects of the strong decays have been studied [9,10,11,12,13,14,15,16,17,18,19,20]. In particular, the decay mechanism and the type of hyperfine interactions in CQMs have been in the focus of interest.…”

Section: Introductionmentioning

confidence: 99%

Covariant calculation of nonstrange decays of strange baryon resonances

2007

View full text Add to dashboard Cite

We report on a study of π and η decays of strange baryon resonances within relativistic constituentquark models based on one-gluon-exchange and Goldstone-boson-exchange dynamics. The investigations are performed in the point form of Poincaré-invariant relativistic quantum mechanics with a spectator-model decay operator. The covariant predictions of the constituent-quark models underestimate the experimental data in most cases. These findings are congruent with an earlier study of nonstrange baryon decays in the light-flavor sector. We also consider a nonrelativistic reduction of the point-form spectator model, which leads to the decay operator of the elementary emission model. For some decays the nonrelativistic results differ substantially from the relativistic ones and they exhibit no uniform behavior as they scatter above and below the experimental decay widths.

show abstract

“…In my discussions with Feynman we had become convinced that the quark model had to include a coupling to mesons which we called the 'Mitra term' after the Indian physicist who had previously studied it [10]. It was necessary in order to describe strong decays where the momentum of the final-state meson is small.…”

Section: Feynman and The Covariant Quark Modelmentioning

confidence: 99%

How I got to work with Feynman on the covariant quark model

Ravndal

2015

Int. J. Mod. Phys. A

View full text Add to dashboard Cite

In the period 1968 -1974 I was a graduate student and then a postdoc at Caltech and was involved with the developments of the quark and parton models. Most of this time I worked in close contact with Richard Feynman and thus was present from the parton model was proposed until QCD was formulated. A personal account is presented how the collaboration took place and how the various stages of this development looked like from the inside until QCD was established as a theory for strong interactions with the partons being quarks and gluons.Already in high school I was interested in elementary particles. Most of my knowledge stemmed from popular articles in Norwegian papers and magazines. Buzzwords like parity violation and strangeness were explained, while more abstract ideas like S-matrix or unified spinor field theory didn't make much sense except for the promise that there might be something deeper underneath. For me a particle was a track in a photographic emulsion or in the newly invented bubble chamber.A great inspiration was the beautiful book The World of Science where I for the first time felt that I got acquainted with modern physics and the people working in the field [1]. In a chapter about elementary particles there was a picture of professors Feynman and GellMann standing in front of a blackboard filled with diagrams and new particle symbols. They seemed very happy with what they were doing and to me it looked like an ideal occupation. This book also set Caltech on my map since it originated there.A few years later in 1964 at the university I came across the article by Gell-Mann et al. in Scientific American about the Eightfold Way and Lie groups [2]. It represented a real revolution -and beautiful so! The walls in my dorm room were soon filled with pictures of octets and decouplets. Here was also the prediction of the Ω − which had just been discovered with the right properties. Finally there was some order in the ever increasing number of new particles which didn't seem so elementary longer.Around the same time came the news that this new symmetry could be explained by assuming that the particles were built up of quarks. These simple ideas explaining so much was something I could follow. From then on I knew that the structure of elementary particles was what I wanted to study more. There were no courses in nuclear or particle physics at the technical university where I studied. But from the elegant book by Okun 1 To be published in 50 Years of Quarks by World Scientific, Singapore.

show abstract

Meson-Baryon Couplings in a Quark Model

Cited by 135 publications

References 16 publications

Hadronic decays of N and Δ resonances in a chiral quark model

Hadronic decays of N and Δ resonances in a chiral quark model

Covariant calculation of nonstrange decays of strange baryon resonances

How I got to work with Feynman on the covariant quark model

Contact Info

Product

Resources

About