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Search: WFRF:(Vlahovic B.) > (2005-2009)

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  • Zhu, L Y, et al. (author)
  • Cross section measurements of charged pion photoproduction in hydrogen and deuterium from 1.1 to 5.5 GeV
  • 2005
  • In: Physical Review C (Nuclear Physics). - 0556-2813. ; 71:4
  • Journal article (peer-reviewed)abstract
    • The differential cross sections for the gamma n ->pi(-)p and the gamma p ->pi(+)n processes were measured at Jefferson Lab. The photon energies ranged from 1.1 to 5.5 GeV, corresponding to center-of-mass energies from 1.7 to 3.4 GeV. The pion center-of-mass angles varied from 50(degrees) to 110(degrees). The pi(-) and pi(+) photoproduction data both exhibit a global scaling behavior at high energies and high transverse momenta, consistent with the constituent counting rule prediction and the existing pi(+) data. The data suggest possible substructure of the scaling behavior, which might be oscillations around the scaling value. The data show an enhancement in the scaled cross section at center-of-mass energy near 2.2 GeV. The differential cross section ratios [d sigma/dt(gamma n ->pi(-)p)/d sigma/dt(gamma p ->pi(+)n)] at high energies and high transverse momenta can be described by calculations based on one-hard-gluon-exchange diagrams.
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