Measurement of the beam-helicity asymmetry in photoproduction of π0η pairs on carbon, aluminum, and lead

6533b82dfe1ef96bd1290b09

RESEARCH PRODUCT

Measurement of the beam-helicity asymmetry in photoproduction of π0η pairs on carbon, aluminum, and lead

R. A. Miskimen A. G. Denig Durga Paudyal M. Wolfes I. Keshelashvili Yu. A. Usov O. Steffen K. Spieker P. Pedroni Susanna Costanza P. Aguar-bartolomé Concettina Sfienti A. N. Mushkarenkov M. Ostrick D. G. Middleton D. G. Middleton M. Günther S. Garni A. Powell I. Supek A. Käser R. Beck I. Gorodnov M. Unverzagt V. L. Kashevarov V. L. Kashevarov F. Cividini Roderick M. Macrae L. V. Fil'kov P. Adlarson M. Oberle S. Abt E. J. Downie Patrick Achenbach D. P. Watts S. Cherepnya A. J. Sarty K. Bantawa G. M. Huber Z. Ahmed S. Kay I. I. Strakovsky T. Rostomyan K. Livingston S. Lutterer B. Strandberg S. Gardner N. S. Borisov C. Mullen Guy Ron D. I. Glazier D. I. Glazier S. Wagner H. J. Arends W. J. Briscoe A. B. Lazarev Michaela Thiel A. Neiser A. Fix A. Braghieri Th. Strub P. Drexler F. Afzal A. B. Neganov Nicholas Zachariou W. Gradl J. Wettig J. C. Mcgeorge V. Sokhoyan P. P. Martel P. P. Martel J. R. M. Annand D. Hornidge E. Mornacchi I. J. D. Macgregor M. Korolija David Manley N. K. Walford B. Krusche K. Altangerel E. Rickert M. Biroth P. B. Otte R. Kondratiev G. M. Gurevich S. N. Prakhov S. N. Prakhov Lilian Witthauer M. Dieterle Lena Heijkenskjöld M. I. Ferretti Bondy Andy Thomas A. Thiel D. Werthmüller C. Collicott C. Collicott M. Bashkanov

subject

Nuclear and High Energy Physics Proton media_common.quotation_subject Nuclear Theory chemistry.chemical_element 7. Clean energy 01 natural sciences Asymmetry Nuclear physics Aluminium 0103 physical sciences Intermediate state Nuclear Experiment 010306 general physics Nuclear Experiment QC media_common Physics 010308 nuclear & particles physics Helicity lcsh:QC1-999 3. Good health chemistry High Energy Physics::Experiment Nucleon Carbon lcsh:Physics Beam (structure)

description

The beam-helicity asymmetry was measured, for the first time, in photoproduction of $\pi^{0}\eta$ pairs on carbon, aluminum, and lead, with the A2 experimental setup at MAMI. The results are compared to an earlier measurement on a free proton and to the corresponding theoretical calculations. The Mainz model is used to predict the beam-helicity asymmetry for the nuclear targets. The present results indicate that the photoproduction mechanism for $\pi^{0}\eta$ pairs on nuclei is similar to photoproduction on a free nucleon. This process is dominated by the $D_{33}$ partial wave with the $\eta\Delta(1232)$ intermediate state.

year	journal	country	edition	language
2020-03-01	Physics Letters B

https://doi.org/10.1016/j.physletb.2020.135243