Beam asymmetry Σ for π+ and π0 photoproduction on the proton for photon energies from 1.102 to 1.862 GeV

CLAS Collaboration, M. Dugger*, B. G. Ritchie, P. Collins, E. Pasyuk, W. J. Briscoe, I. I. Strakovsky, R. L. Workman, Y. Azimov, K. P. Adhikari, D. Adikaram, M. Aghasyan, M. J. Amaryan, M. D. Anderson, S. Anefalos Pereira, H. Avakian, J. Ball, N. A. Baltzell, M. Battaglieri, V. BatourineI. Bedlinskiy, A. S. Biselli, S. Boiarinov, V. D. Burkert, D. S. Carman, A. Celentano, S. Chandavar, P. L. Cole, M. Contalbrigo, O. Cortes, V. Crede, A. D'Angelo, N. Dashyan, R. De Vita, E. De Sanctis, A. Deur, C. Djalali, D. Doughty, R. Dupre, H. Egiyan, A. El Alaoui, L. El Fassi, P. Eugenio, G. Fedotov, S. Fegan, J. A. Fleming, N. Gevorgyan, Gary Smith, D. P. Watts, Nicholas Zachariou, J. Zhang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Beam asymmetries for the reactions γp→pπ0 and γp→nπ+ have been measured with the CEBAF Large Acceptance Spectrometer (CLAS) and a tagged, linearly polarized photon beam with energies from 1.102–1.862 GeV. A Fourier moment technique for extracting beam asymmetries from experimental data is described. The results reported here possess greater precision and finer energy resolution than previous measurements. Our data for both pion reactions appear to favor the SAID and Bonn-Gatchina scattering analyses over the older Mainz MAID predictions. After incorporating the present set of beam asymmetries into the world database, exploratory fits made with the SAID analysis indicate that the largest changes from previous fits are for properties of the Δ(1700)3/2− and Δ(1905)5/2+ states.
Original languageEnglish
Article number065203
Number of pages23
JournalPhysical Review C
Issue number6
Publication statusPublished - 18 Dec 2013


  • CLAS
  • PI0


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