Title: Aspects of the ETH model of the pion-nucleon interaction
Authors : Matsinos, Evangelos
Rasche, Günther
Published in : Nuclear Physics A, Nuclear and hadronic physics
Volume(Issue) : 927
Pages : 147
Pages to: 194
Publisher / Ed. Institution : Elsevier
Issue Date: 3-Nov-2013
License (according to publishing contract) : Licence according to publishing contract
Type of review: Peer review (Publication)
Language : English
Subjects : High Energy Physics - Phenomenology
Subject (DDC) : 530: Physics
Abstract: The ETH model of the pion–nucleon (πN) interaction contains t-channel σ- and ρ-exchange graphs, as well as the s- and u-channel contributions with the well-established s and p baryon states with masses below 2 GeV as virtual particles; the model amplitudes obey crossing symmetry and isospin invariance. In the present work, we give the analytical expressions for the model contributions to the K-matrix elements up to (and including) the f waves. We also extract a new phase-shift solution after performing a partial-wave analysis of meson-factory π±p elastic-scattering data below 100 MeV; included in our results now are also the effects of the variation of the σ-meson mass in the interval which is currently recommended by the Particle-Data Group. Finally, we revisit the subject of the πN Σ term and, using the model amplitudes, obtain Σ=72.4±3.1 MeV. Our prediction agrees well with the result extracted with Olsson's method, after a few flaws in his paper were corrected.
Departement: School of Engineering
Organisational Unit: Institute of Applied Mathematics and Physics (IAMP)
Institute of Mechatronic Systems (IMS)
Publication type: Article in scientific Journal
DOI : 10.1016/j.nuclphysa.2014.04.021
ISSN: 0375-9474
URI: https://digitalcollection.zhaw.ch/handle/11475/15773
Appears in Collections:Publikationen School of Engineering

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