6533b7d9fe1ef96bd126c0e5

RESEARCH PRODUCT

Threshold π0 photoproduction on transverse polarised protons at MAMI

V. SokhoyanV. SokhoyanS. CostanzaB. KruscheH. J. ArendsG. M. HuberT. RostomyanLothar TiatorV. L. KashevarovV. L. KashevarovM. H. SikoraM. OstrickL. V. Fil'kovP. Hall-barrientosS. N. PrakhovC. S. AkondiW. GradlA. PolonskiS. GarniD. I. GlazierD. I. GlazierA. J. SartyA. BraghieriD. HornidgeB. OussenaC. CollicottE. J. DownieE. J. DownieA. ThomasA. MushkarenkovV. LisinE. F. McnicollD. P. WattsK. LivingstonDurga PaudyalI. KeshelashviliDavid HamiltonR. MiskimenLilian WitthauerN. S. BorisovW. MeyerM. WolfesP. PedroniV. V. PolyanskiR. KondratievJ. MancelG. ReicherzIgor StrakovskyA. B. NeganovCésar Fernández-ramírezA. B. LazarevA. NikolaevG. M. GurevichB. M. K. NefkensD. G. MiddletonD. G. MiddletonTh. StrubH. OrtegaM. DieterleReinhard BeckYu. A. UsovO. SteffenJ. R. M. AnnandW. J. BriscoeS. CherepnyaP. OttI. J. D. MacgregorDavid ManleyA. FixD. WerthmüllerD. WerthmüllerP. P. MartelP. P. MartelAron M. BernsteinI. SupekM. OberleM. UnverzagtD. HowdleM. KorolijaS. SchumannS. SchumannP. B. Otte

subject

PhysicsNuclear and High Energy PhysicsPhotonChiral perturbation theoryScatteringmedia_common.quotation_subjectAsymmetryNuclear physicsCross section (physics)Transverse planeAtomic physicsNuclear ExperimentMultipole expansionMicrotronmedia_common

description

Abstract Polarisation-dependent differential cross sections σ T associated with the target asymmetry T have been measured for the reaction γ p → → p π 0 with transverse target polarisation from π 0 threshold to photon energies of 190 MeV. The data were obtained using a frozen-spin butanol target with the Crystal Ball / TAPS detector set-up and the Glasgow photon tagging system at the Mainz Microtron MAMI. Results for σ T have been used in combination with our previous measurements of the unpolarised cross section σ 0 and the beam asymmetry Σ for a model-independent determination of S- and P-wave multipoles in the π 0 threshold region, which includes for the first time a direct determination of the imaginary part of the E 0 + multipole.

yearjournalcountryeditionlanguage
2015-11-01Physics Letters B
https://doi.org/10.1016/j.physletb.2015.09.015