skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Study of the Axial Anomaly using the γp → π +0 n Reaction Near Threshold

Abstract

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 γp → π +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 γp → Pπ +π 0n reaction have been measured with incident photon energies between 1 and 2 GeV. The Chew-Low extrapolation technique was used to extract the associated γπ → ππ cross sections from the differential cross sections. The extrapolation procedure of extracting the pole cross section has been explored. F was obtained from the γπ → ππ cross sections. The results show a momentum dependence of the F 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 , and extend the measurements to the lower and higher s regions.

Authors:
 [1]
  1. Univ. of Massachusetts, Amherst, MA (United States)
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
824906
Report Number(s):
JLAB-PHY-00-69; DOE/ER/40150-2752
TRN: US0402242
DOE Contract Number:  
AC05-84ER40150
Resource Type:
Thesis/Dissertation
Resource Relation:
Other Information: TH: Thesis (Ph.D.); Submitted to Univ. of Massachusetts, Amherst, MA (US); PBD: 1 May 2000
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; AMPLITUDES; CROSS SECTIONS; DIFFERENTIAL CROSS SECTIONS; EXTRAPOLATION; PHOTONS; PHOTOPRODUCTION; QUANTUM CHROMODYNAMICS

Citation Formats

Asavapibhop, Burin. Study of the Axial Anomaly using the γp → π+Pπ0 n Reaction Near Threshold. United States: N. p., 2000. Web. doi:10.2172/824906.
Asavapibhop, Burin. Study of the Axial Anomaly using the γp → π+Pπ0 n Reaction Near Threshold. United States. doi:10.2172/824906.
Asavapibhop, Burin. Mon . "Study of the Axial Anomaly using the γp → π+Pπ0 n Reaction Near Threshold". United States. doi:10.2172/824906. https://www.osti.gov/servlets/purl/824906.
@article{osti_824906,
title = {Study of the Axial Anomaly using the γp → π+Pπ0 n Reaction Near Threshold},
author = {Asavapibhop, Burin},
abstractNote = {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 γp → π+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 γp → Pπ+π0n reaction have been measured with incident photon energies between 1 and 2 GeV. The Chew-Low extrapolation technique was used to extract the associated γπ → ππ cross sections from the differential cross sections. The extrapolation procedure of extracting the pole cross section has been explored. F3π was obtained from the γπ → ππ cross sections. The results show a momentum dependence of the F3π 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 F3π, and extend the measurements to the lower and higher s regions.},
doi = {10.2172/824906},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2000},
month = {5}
}

Thesis/Dissertation:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this thesis or dissertation.

Save / Share: