The chiral S = −1 meson–baryon interaction with new constraints on the NLO contributions

2016/05/12 by A. Ramos, À. Ramos, A. Feijoo +1
Physics and Astronomy · #Amplitude #Baryon #Branching fraction #High-Energy Particle Collisions Research #Isospin #Lagrangian #Meson #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #Theoretical physics #Work (physics) #hep-ph #nucl-th

paper · pdf · doi:10.1016/j.nuclphysa.2016.05.006

21 pages, 6 figures. Accepted for publication in Nuclear Physics A (special issue on Strangeness and Charm Nuclear Physics). arXiv admin note: text overlap with arXiv:1502.07956

arxiv created 2016/05/12 · openalex publication_date 2016/05/12 · openalex created_date 2016/06/24 · arxiv updated 2016/08/24 · openalex updated_date 2026/08/05

Abstract

We present a study of the S=-1 meson-baryon interaction, employing a chiral SU(3) Lagrangian up to next-to-leading order (NLO) and implementing unitarization in coupled channels. The parameters of the model have been fitted to a large set of experimental scattering data in different two-body channels, to threshold branching ratios, and to the precise SIDDHARTA value of the energy shift and width of kaonic hidrogen. In contrast to other groups, we have taken into consideration the K^- p→ K⁺Ξ^-, K⁰Ξ⁰ reaction data, since we found in a previous work to be especially sensitive to the NLO parameters of the chiral Lagrangian. In the present work we also include the Born terms, which usually have very little effect, and find them to be non-negligible in the K^- p→ KΞ channels, correspondingly causing significant modifications to the NLO parameters. We furthermore show that the importance of the Born terms becomes more visible in the isospin projected amplitudes of the K^-p → KΞ reactions. The measurement of processes that filter single isospin components, like the K⁰_L p → K⁺ Ξ⁰ reaction that could be measured at the proposed secondary K⁰_L beam at Jlab, would put valuable constraints on the chiral models describing the meson-baryon interaction in the S=-1 sector.

Citations

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