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$\pi^+$ photoproduction on the proton for photon energies from 0.725 to 2.875 GeV

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arxiv 0903.1110 v2 pith:TJUUFIPH submitted 2009-03-05 hep-ex

The CLAS Collaboration: M. Dugger , B.G. Ritchie , J.P. Ball , P. Collins , E. Pasyuk , R.A. Arndt , W.J. Briscoe , I.I. Strakovsky
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R.L. Workman et al
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keywords beencrosssaidsectionsenergiesphotonreactionresults
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abstract

Differential cross sections for the reaction $\gamma p \to n \pi^+$ have been measured with the CEBAF Large Acceptance Spectrometer (CLAS) and a tagged photon beam with energies from 0.725 to 2.875 GeV. Where available, the results obtained here compare well with previously published results for the reaction. Agreement with the SAID and MAID analyses is found below 1 GeV. The present set of cross sections has been incorporated into the SAID database, and exploratory fits have been made up to 2.7 GeV. Resonance couplings have been extracted and compared to previous determinations. With the addition of these cross sections to the world data set, significant changes have occurred in the high-energy behavior of the SAID cross-section predictions and amplitudes.

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Cited by 2 Pith papers

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  1. Insights into the $\mathbf{\gamma^{(*)} + N(940)\frac{1}{2}^+ \to \Delta(1700)\frac{3}{2}^{-}}$ transition

    hep-ph 2025-02 accept novelty 6.0 of 10

    First SCI-DSE quark-diquark calculation of the gamma* N -> Delta(1700) transition form factors and helicity amplitudes, benchmarked against JLab and CLAS data.

  2. Electroexcitation of Nucleon Resonances and the Emergence of Hadron Mass

    hep-ph 2025-05 conditional novelty 2.0 of 10

    A review argues that Jefferson Lab electroproduction data on nucleon resonances, analyzed with continuum Schwinger methods, confirm a momentum-dependent dressed quark mass, the essence of emergent hadron mass.

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