Single π0 production off neutrons bound in deuteron with linearly polarized photons

(A2 Collaboration MAMI) Mullen, C.; Gardner, S.; Glazier, D. I.; Kay, S. J. D.; Livingston, K.; Strakovsky, I. I.; Workman, R. L.; Abt, S.; Achenbach, P.; Afzal, F.; Ahmed, Z.; Akondi, C. S.; Annand, J. R. M.; Bashkanov, M.; Beck, R.; Biroth, M.; Borisov, N. S.; Braghieri, A.; Briscoe, W. J.; Cividini, F.; Collicott, C.; Costanza, S.; Denig, A.; Dieterle, M.; Downie, E. J.; Drexler, P.; Fegan, S.; Ferretti-Bondy, M. I.; Ghosal, D.; Gorodnov, I.; Gradl, W.; Günther, M.; Gurevic, G.; Heijkenskjöld, L.; Hornidge, D.; Huber, G. M.; Jermann, N.; Kaeser, A.; Korolija, Milorad; Kashevarov, V. L.; Krusche, B.; Kulikov, V. V.; Lazarev, A.; Lutterer, S.; MacGregor, I. J. D.; Manley, D. M.; Martel, P. P.; Martemianov, M. A.; Meier, C.; Miskimen, R.; Mocanu, M.; Mornacchi, E.; Neganov, A.; Oberle, M.; Ostrick, M.; Otte, P.; Paudyal, D.; Pedroni, P.; Powell, A.; Prakhov, S. N.; Reicherz, G.; Ron, G.; Rostomyan, T.; Sfienti, C.; Sokhoyan, V.; Spieker, K.; Steffen, O.; Strub, Th.; Supek, Ivan; Thiel, A.; Thiel, M.; Thomas, A.; Unverzagt, M.; Usov, Yu. A.; Wagner, S.; Walford, N. K.; Watts, D. P.; Werthmüller, D.; Wettig, J.; Witthauer, L.; Wolfes, M.; Zachariou, N. (2021) Single π0 production off neutrons bound in deuteron with linearly polarized photons. European physical journal A : hadrons and nuclei, 57 (6). ISSN 1434-6001

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Abstract

The quasifree (gamma) over right arrowd -> pi(0)n(p) photon beam asymmetry, Sigma, has been measured at photon energies, E-gamma, from 390 to 610 MeV, corresponding to center of mass energy from 1.271 to 1.424 GeV, for the first time. The data were collected in the A2 hall of the MAMI electron beam facility with the Crystal Ball and TAPS calorimeters covering pion center-of-mass angles from 49 degrees to 148 degrees. In this kinematic region, polarization observables are sensitive to contributions from the Delta(1232) and N(1440) resonances. The extracted values of Sigma have been compared to predictions based on partial-wave analyses (PWAs) of the existing pion photoproduction database. Our comparison includes the SAID, MAID and Bonn-Gatchina analyses; while a revised SAID fit, including the new Sigma measurements, has also been performed. In addition, isospin symmetry is examined as a way to predict pi(0)n photoproduction observables, based on fits to published data in the channels pi(0)p, pi(+)n and pi(-)p.

Item Type:	Article
Uncontrolled Keywords:	coherent bremsstrahlung; cross-sections; photoproduction; pions
Subjects:	NATURAL SCIENCES > Physics
Divisions:	Division of Experimental Physics
Depositing User:	Ivan Supek
Date Deposited:	06 May 2026 12:42
URI:	https://fulir.irb.hr:/id/eprint/11912
DOI:	10.1140/epja/s10050-021-00521-9

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