6533b85dfe1ef96bd12bf0d2

RESEARCH PRODUCT

First measurement of the circular beam asymmetry in the γ→p→π0ηp reaction

M. KotullaM. H. SikoraA. KoulbardisE. J. DownieI.i. StakovskyD. G. MiddletonP. Aguar-bartoloméD. BranfordYasser MaghrbiC. M. TarbertT. RostomyanM. OstrickA. NikolaevL. K. AkasoyW. J. BriscoeA. N. MushkarenkovB. M. K. NefkensD. WerthmüllerA. BraghieriF. ZehrM. Martinez-fabregateR. F. B. CodlingJ. D. KellieD. MekterovicS. P. KruglovR. BeckD. I. GlazierI. JaegleR. KondratievR. GregorI. ZamboniB. DemissieB. OussenaD. P. WattsI. M. SuarezK. BantawaV. S. BekrenevI. KeshelashviliD. I. SoberV. MetagJ. RobinsonF. PheronM. UnverzagtI. J. D. MacgregorA. StarostinS. CherepnyaE. HeidD. HornidgeL. V. Fil'kovA. PolonskiV. L. KashevarovH. BerghäuserK. LivingstonT. C. JudeP. PedroniJason BrudvikJ. R. M. AnnandSasa MicanovicH. J. ArendsA. FixE. F. McnicollG. RosnerS. SchumannR. W. NovotnyP. B. OtteB. KruscheMichaela ThielD. M. ManleyM. KorolijaS. N. PrakhovAndy ThomasJ. C. McgeorgeV. LisinO. JahnDavid HamiltonP. DrexlerI. Supek

subject

PhysicsNuclear reactionNuclear and High Energy PhysicsPhotonProton010308 nuclear & particles physicsmedia_common.quotation_subjectResonanceElementary particle01 natural sciencesAsymmetryDelta baryonNuclear physics0103 physical sciencesNuclear Experiment010306 general physicsCrystal Ballmedia_common

description

Abstract The circular photon asymmetry for π 0 η photoproduction on the proton was measured for the first time at the tagged photon facility of the MAMI C accelerator using the Crystal Ball/TAPS photon spectrometer. The experimental results are interpreted within a phenomenological isobar model that confirms the dominant role of the Δ ( 1700 ) D 33 resonance. The measured asymmetry allows us to identify small contributions from positive-parity resonances via interference terms with the dominant D 33 amplitude.

https://doi.org/10.1016/j.physletb.2010.09.028