Differential cross sections in {π_1hn±p [pi ± p] scattering at low energies [Elektronische Ressource] / vorgelegt von Holger Denz

Description

Di eren tial Cross Sectionsin p Scattering at Low EnergiesDissertationzur Erlangung des Grades eines Doktorsder Naturwissenschaftender Fakultat fur Mathematik und Physikder Eberhard-Karls-Universitat Tubingen vorgelegt vonHolger Denzaus Tubingen2004Tag der mundlichen Prufung: 02.07.2004 Dekan: Prof. Dr. H. Muther1. Berichterstatter: Prof. Dr. G.J. Wagner2. Berich Prof. Dr. H. ClementiThe pion-nucleon sigma term, which is an important parameter in chiralperturbation theory and a measure of explicit chiral symmetry breaking ofQCD due to non-vanishing current quark masses, can be extracted from elas-tic p scattering data using partial wave analyses and dispersion relations.However, results of recent analyses yield a very large value for the sigma term,which leads to problems with the interpretation. Since the quality of thedatabase on which the extraction is based is crucial for the result and thereare known problems with incompatible measurements and scarce low energydata available, a new experiment was carried out within the CHAOS collab-oration. Using the CHAOS detector and a newly developed range telescopecovering the extreme forward scattering angles, di eren tial cross sections in p elastic scattering were measured at 19.9, 25.8, 32.0, 37.1, 43.3, 57.0 and67.0 MeV pion kinetic energy at the TRIUMF meson factory in Vancouver,Canada.

Sujets

• Physik

Informations

• Publié par: eberhard_karls_universitat_tubingen
• Publié le: 01 janvier 2004
• Nombre de lectures: 7
• Langue: English
• Poids de l'ouvrage: 5 Mo

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