Study of the Axial Anomaly using the {gamma}p {yields} {pi}{sup +}P{pi}{sup 0} n Reaction Near Threshold

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This experiment was one of the first photoproduction experiments performed at Jefferson Lab using the CLAS and the Photon Tagger. The event reconstruction and the photon flux determination procedures have been developed and were proven to work well as we can see from the cross section measurement of the {gamma}p {yields} {pi}{sup +}n reaction. The preliminary results at CLAS for this reaction agree very well with previous world data. The analysis procedure has been developed to analyze the double-pion photoproduction. The differential cross sections for the {gamma}p {yields} P{pi}{sup +}{pi}{sup 0}n reaction have been measured with incident photon energies between ... continued below

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39,710 Kilobytes pages

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Asavapibhop, Burin May 1, 2000.

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This experiment was one of the first photoproduction experiments performed at Jefferson Lab using the CLAS and the Photon Tagger. The event reconstruction and the photon flux determination procedures have been developed and were proven to work well as we can see from the cross section measurement of the {gamma}p {yields} {pi}{sup +}n reaction. The preliminary results at CLAS for this reaction agree very well with previous world data. The analysis procedure has been developed to analyze the double-pion photoproduction. The differential cross sections for the {gamma}p {yields} P{pi}{sup +}{pi}{sup 0}n reaction have been measured with incident photon energies between 1 and 2 GeV. The Chew-Low extrapolation technique was used to extract the associated {gamma}{pi} {yields} {pi}{pi} cross sections from the differential cross sections. The extrapolation procedure of extracting the pole cross section has been explored. F{sup 3{pi}} was obtained from the {gamma}{pi} {yields} {pi}{pi} cross sections. The results show a momentum dependence of the F{sup 3{pi}} amplitude in which they agree with Holstein's calculation. These measurements test fundamental predictions of low energies QCD. Future work on this analysis will help reduce the uncertainty in F{sup 3{pi}}, and extend the measurements to the lower and higher s regions.

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39,710 Kilobytes pages

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  • Other Information: TH: Thesis (Ph.D.); Submitted to Univ. of Massachusetts, Amherst, MA (US)

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  • Report No.: JLAB-PHY-00-69
  • Report No.: DOE/ER/40150-2752
  • Grant Number: AC05-84ER40150
  • Office of Scientific & Technical Information Report Number: 824906
  • Archival Resource Key: ark:/67531/metadc786324

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • May 1, 2000

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  • Dec. 3, 2015, 9:30 a.m.

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  • Aug. 4, 2016, 7:55 p.m.

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Asavapibhop, Burin. Study of the Axial Anomaly using the {gamma}p {yields} {pi}{sup +}P{pi}{sup 0} n Reaction Near Threshold, thesis or dissertation, May 1, 2000; Newport News, Virginia. (digital.library.unt.edu/ark:/67531/metadc786324/: accessed October 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.