Abstract/Details

Study of the axial anomaly in the (gamma-proton going to charged-pion neutral-pion neutron) reaction at low t using the clas and the photon tagger


2000 2000

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Abstract (summary)

While the agreement between theory and experiment is excellent for the π 0 → 2γ reaction, other reactions that proceed through the axial anomaly have been poorly tested. For example the existing measurement of the γ → 3π amplitude, F, is in poor agreement with theory. In the limit of low s and t, the γp → π+π 0n reaction is sensitive to F. In this thesis preliminary cross sections for the γp → π +π0n reaction are presented using the CLAS with tagged photon energies between 1 and 2 GeV and over a range in s and t up to 1 GeV2. The π+ was detected using the time-of-flight and tracking systems. The π0 was detected via reconstruction of the invariant mass of its two decay photons, which were detected by an electromagnetic calorimeter. The presence of the neutron was inferred via missing mass. The sensitivity of these cross sections to F in the low t region is studied for s = [special characters omitted] and s = [special characters omitted] at Eγ = 2 GeV. The results show a momentum dependence of the F and are consistent with a calculation that includes the effects of ππ final state interactions on the chiral perturbation prediction for F.

Indexing (details)


Subject
Nuclear physics
Classification
0610: Nuclear physics
Identifier / keyword
Pure sciences; Axial anomaly; Chiral anomaly; Neutron; Photon tagger; Pion
Title
Study of the axial anomaly in the (gamma-proton going to charged-pion neutral-pion neutron) reaction at low t using the clas and the photon tagger
Author
Asavapibhop, Burin
Number of pages
182
Publication year
2000
Degree date
2000
School code
0118
Source
DAI-B 61/07, Dissertation Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
ISBN
0599844175, 9780599844179
Advisor
Miskimen, Rory A.
University/institution
University of Massachusetts Amherst
University location
United States -- Massachusetts
Degree
Ph.D.
Source type
Dissertations & Theses
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
9978469
ProQuest document ID
304609169
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
http://search.proquest.com/docview/304609169
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