Helicity-Dependent Cross Sections for the Photoproduction of pi(0) Pairs from Nucleons

Dieterle, M. and Witthauer, L. and Fix, A. and Abt, S. and Achenbach, P. and Adlarson, P. and Afzal, F. and Bartolome, P. Aguar and Ahmed, Z. and Annand, J. R. M. and Arends, H. J. and Bashkanov, M. and Beck, R. and Biroth, M. and Borisov, N. and Braghieri, A. and Briscoe, W. J. and Cividini, F. and Collicott, C. and Costanza, S. and Denig, A. and Dolzhikov, A. S. and Downie, E. J. and Drexler, P. and Gardner, S. and Ghosal, D. and Glazier, D. I. and Gorodnov, I. and Gradl, W. and Gunther, M. and Gurevich, D. and Heijkenskjoed, L. and Hornidge, D. and Huber, G. M. and Kaser, A. and Kashevarov, V. L. and Kay, S. and Keshelashvili, I. and Kondratiev, R. and Korolija, M. and Krusche, B. and Lazarev, A. and Lisin, V. and Livingston, K. and Lutterer, S. and MacGregor, I. J. D. and Manley, D. M. and Martel, P. P. and Metag, V. and Meyer, W. and Middleton, D. G. and Miskimen, R. and Mornacchi, E. and Mullen, C. and Mushkarenkov, A. and Neganov, A. and Neiser, A. and Oberle, M. and Ostrick, M. and Otte, P. B. and Paudyal, D. and Pedroni, P. and Polonski, A. and Powell, A. and Prakhov, S. N. and Reicherz, G. and Ron, G. and Rostomyan, T. and Sarty, A. and Sfienti, C. and Sokhoyan, V. and Spieker, K. and Steffen, O. and Strakovsky, I. I. and Strub, T. and Supek, I. and Thiel, A. and Thiel, M. and Thomas, A. and Unverzagt, M. and Usov, Yu. A. and Wagner, S. and Walford, N. K. and Watts, D. P. and Werthmuller, D. and Wettig, J. and Wolfes, M. and Zana, L. A.. (2020) Helicity-Dependent Cross Sections for the Photoproduction of pi(0) Pairs from Nucleons. Physical Review Letters, 125 (6). 062001.

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The double-polarization observable E and helicity-dependent cross sections sigma(1/2) , sigma(3/2) have been measured for the photoproduction of pi(0) pairs off quasifree protons and neutrons at the Mainz MAMI accelerator with the Crystal Ball/TAPS setup. A circularly polarized photon beam was produced by bremsstrahlung from longitudinally polarized electrons and impinged on a longitudinally polarized deuterated butanol target. The reaction products were detected with an almost 4 pi covering calorimeter. The results reveal for the first time the helicity- and isospin-dependent structure of the gamma N -> N pi(0)pi(0) reaction. They are compared to predictions from reaction models in view of nucleon resonance contributions and also to a refit of one model that predicted results for the proton and for the neutron target. The comparison of the prediction and the refit demonstrates the large impact of the new data.
Faculties and Departments:05 Faculty of Science > Departement Physik > Former Organization Units Physics > Hadronenphysik (Krusche)
UniBasel Contributors:Krusche, Bernd
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Physical Society
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:15 Feb 2021 16:38
Deposited On:15 Feb 2021 16:38

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