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Title: Exclusive Photoproduction of Charged Pions in Hydrogen and Deuterium from 1 to 6 GeV

Abstract

The study of the transition region in the description of exclusive processes and hadron structure, from the nucleon-meson degrees of freedom in meson-exchange models at low energy to the quark-gluon degrees of freedom in pQCD at high energy, is essential for us to understand the strong interaction. The differential cross section measurements for exclusive reactions at fixed center-of-mass angles enable us to investigate the constituent counting rule, which explicitly connects the quark-gluon degrees of freedom to the energy dependence of differential cross sections. JLab Experiment E94-104 was carried out in Hall A with two high resolution spectrometers. It included the coincidence cross section measurement for the γn --> π-[p] process with a deuterium target and the singles measurement for the γp --> π+[n] process with a hydrogen target. The untagged real photons were generated by the electron beam impinging on a copper radiator. The photon energies ranged from 1.1 to 5.5 GeV, corresponding to the center-of-mass energies from 1.7 to 3.4 GeV. The pion center-of-mass angles were fixed at 50 deg, 70 deg, 90 deg, and also 100 deg, 110 deg at a few energies. The JLab E94-104 data presented in this thesis contain four interesting features. The data exhibitmore » a global scaling behavior for both π- and π+ photoproduction at high energies and high transverse momenta, consistent with the constituent counting rule and the existing π+ photoproduction data. This implies that the quark-gluon degrees of freedom start to play a role at this energy scale. The data suggests possible substructure of the scaling behavior, which might be oscillations around the scaling value. There are several possible mechanisms that can cause oscillations, for example the one associated with the generalized constituent counting rule involving quark orbital angular momentum. The data show an enhancement in the scaled cross section at center-of-mass energy near 2.2 GeV, where baryon resonances are not as well known as those at low energies. The differential cross section ratios for exclusive γn --> π-[p] to γp --> π+[n] process at θcm = 90 deg start to show consistency with the prediction based on one-hard-gluon-exchange diagrams at high energies.« less

Authors:
 [1]
  1. Massachusetts Inst. of Technology (MIT), Cambridge, 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:
893081
Report Number(s):
JLAB-PHY-04-316; DOE/ER/40150-4067
TRN: US200625%%65
DOE Contract Number:  
AC05-06OR23177
Resource Type:
Thesis/Dissertation
Country of Publication:
United States
Language:
English
Subject:
08 HYDROGEN; BOSON-EXCHANGE MODELS; CROSS SECTIONS; DEGREES OF FREEDOM; DEUTERIUM; DEUTERIUM TARGET; DIFFERENTIAL CROSS SECTIONS; ELECTRON BEAMS; ENERGY DEPENDENCE; FORECASTING; HYDROGEN; ORBITAL ANGULAR MOMENTUM; PHOTOPRODUCTION; PIONS; STRONG INTERACTIONS

Citation Formats

Zhu, Lingyan. Exclusive Photoproduction of Charged Pions in Hydrogen and Deuterium from 1 to 6 GeV. United States: N. p., 2004. Web. doi:10.2172/893081.
Zhu, Lingyan. Exclusive Photoproduction of Charged Pions in Hydrogen and Deuterium from 1 to 6 GeV. United States. https://doi.org/10.2172/893081
Zhu, Lingyan. 2004. "Exclusive Photoproduction of Charged Pions in Hydrogen and Deuterium from 1 to 6 GeV". United States. https://doi.org/10.2172/893081. https://www.osti.gov/servlets/purl/893081.
@article{osti_893081,
title = {Exclusive Photoproduction of Charged Pions in Hydrogen and Deuterium from 1 to 6 GeV},
author = {Zhu, Lingyan},
abstractNote = {The study of the transition region in the description of exclusive processes and hadron structure, from the nucleon-meson degrees of freedom in meson-exchange models at low energy to the quark-gluon degrees of freedom in pQCD at high energy, is essential for us to understand the strong interaction. The differential cross section measurements for exclusive reactions at fixed center-of-mass angles enable us to investigate the constituent counting rule, which explicitly connects the quark-gluon degrees of freedom to the energy dependence of differential cross sections. JLab Experiment E94-104 was carried out in Hall A with two high resolution spectrometers. It included the coincidence cross section measurement for the γn --> π-[p] process with a deuterium target and the singles measurement for the γp --> π+[n] process with a hydrogen target. The untagged real photons were generated by the electron beam impinging on a copper radiator. The photon energies ranged from 1.1 to 5.5 GeV, corresponding to the center-of-mass energies from 1.7 to 3.4 GeV. The pion center-of-mass angles were fixed at 50 deg, 70 deg, 90 deg, and also 100 deg, 110 deg at a few energies. The JLab E94-104 data presented in this thesis contain four interesting features. The data exhibit a global scaling behavior for both π- and π+ photoproduction at high energies and high transverse momenta, consistent with the constituent counting rule and the existing π+ photoproduction data. This implies that the quark-gluon degrees of freedom start to play a role at this energy scale. The data suggests possible substructure of the scaling behavior, which might be oscillations around the scaling value. There are several possible mechanisms that can cause oscillations, for example the one associated with the generalized constituent counting rule involving quark orbital angular momentum. The data show an enhancement in the scaled cross section at center-of-mass energy near 2.2 GeV, where baryon resonances are not as well known as those at low energies. The differential cross section ratios for exclusive γn --> π-[p] to γp --> π+[n] process at θcm = 90 deg start to show consistency with the prediction based on one-hard-gluon-exchange diagrams at high energies.},
doi = {10.2172/893081},
url = {https://www.osti.gov/biblio/893081}, journal = {},
number = ,
volume = ,
place = {United States},
year = {2004},
month = {2}
}

Thesis/Dissertation:
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