Measurement of Pion-Pion Final State Interactions in η → π +π −γ with CLAS at Jefferson Lab

<p>Decays of pseudoscalar mesons proceed from the chiral anomaly, which arises from spontaneous chiral symmetry breaking. In the limit of massless quarks (chiral limit), the η → π +π −γ the decay width is determined solely by the box anomaly term in the Wess Zumino Witten Lagrangian. Since the physical quarks are not massless, the decay region of the η meson is far from the chiral limit and thus proper inclusion of the momentum dependence is essential to reproduce the measured decay width. Several theoretical frameworks have been proposed to describe these interactions. We report a new measurement of the α parameter which measures the contribution of pion-pion final state interactions to the differential decay width.</p> <p>The data was collected during the g11a run period using the CEBAF Large Acceptance Spectrometer located in Hall B at the Thomas Jefferson National Accelerator Facility in 2004. The data was collected using a tagged photon beam with energy range of 1.5-3.5 GeV incident on a liquid Hydrogen target. Our results are in agreement with the latest experimental measurement and theoretical calculations</p>

Name thesis:degree_name

Doctor of Philosophy (PhD)

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Physics

Year dc:date.available

2020

Author dc:creator

• Jeske, Torri C.

Contributors dc:contributor

• Moskov Amaryan
• Alexander Gurevich
• Sebastian Kuhn
• Anatoly Radyushkin
• Richard Zimmerman

• Decays
• Pseudoscalar meson
• Quarks
• Thomas Jefferson National Accelerator Facility
• Elementary Particles and Fields and String Theory
• Nuclear

Statement dc:rights

• <p>In Copyright. URI: <a href="http://rightsstatements.org/vocab/InC/1.0/">http://rightsstatements.org/vocab/InC/1.0/</a> This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).</p>

Identifier

9798557074995

OAI identifier oai:identifier

oai:digitalcommons.odu.edu:physics_etds-1128