Photoproduction of π 0 ω off protons for E γ ≤3 GeV

Junkersfeld, J.; Anisovich, A. V.; Anton, G.; Bantes, R.; Bartholomy, O.; Beck, R.; Beloglazov, Y. A.; Bogendoerfer, R.; Castelijns, R.; Credé, V.; Ehmanns, A.; Ernst, J.; Fabry, I.; Flemming, H.; Foesel, A.; Fuchs, Markus; Funke, Ch.; Gothe, R.; Gridnev, A.; Gutz, E.; Höeffgen, Stefan K.; Horn, I.; Hößl, J.; Kalinowsky, H.; Клейн, Ф.; Klempt, E.; Koch, H.; Konrad, M.; Kopf, B.; Krusche, B.; Langheinrich, J.; Löhner, H.; Lopatin, I.; Lotz, J.; Mattaey, H.; Menze, D.; Messchendorp, J. G.; Nikonov, V. A.; Novinski, D.; Ostrick, M.; Pee, H. van; Radkov, A.; Sarantsev, A.; Schadmand, S.; Schmidt, Ch.; Schmieden, H.; Schoch, B.; Suft, G.; Sumachev, V. V.; Szczepanek, T.; Thoma, U.; Walther, Dirk; Weinheimer, C.

doi:10.1140/epja/i2006-10302-7

Cited by 10 publications

(8 citation statements)

References 51 publications

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“…Δ * decays can be studied in the process γp → π 0 ωp to which the isobar Δ(1232)ω makes the most significant contribution [139]. Similarly, the reaction γp → K * Λ has no Δ * contributions [140].…”

Section: Photoproduction Of ω Mesonsmentioning

confidence: 99%

Partial wave analysis

2017

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Abstract. The project A.2 of the SFB/TR16 "Subnuclear Structure of Matter" aimed at a combined multichannel partial wave analysis of all or of most data on pion and photo-induced reactions for invariant masses from the Δ(1232) region to 2300 MeV. In this review the most important results are presented. It is shown that the data and their partial wave analysis have improved our understanding of the dynamics of excited light-quark baryons significantly.

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Section: Photoproduction Of ω Mesonsmentioning

confidence: 99%

Partial wave analysis

2017

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“…Recently, differential cross sections and spin density matrix elements were determined for single ω meson photoproduction off the proton [88]. The reaction γp → π 0 ωp was shown to be dominated by Δ(1232)ω production [89]. Measurements of the beam asymmetry were carried out for various final states: pπ 0 [90,91], pη [67], pω [92], and K 0 s Σ + [84], (see also contribution of project B.1 to these proceedings).…”

Section: Differential Cross Sections and The Beam Asymmetry σmentioning

confidence: 99%

Spectroscopy of baryon resonances

Beck

Thoma

2017

EPJ Web Conf.

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Abstract. Within project A.1 of the SFB/TR16 "Subnuclear Structure of Matter", a large amount of data on photoproduction reactions has been accumulated at the Bonn Electron Stretcher Accelerator ELSA with the CBELSA/TAPS detector and was analysed in detail. In particular, data have been taken with unpolarized or with linearly or circularly polarized photons and with unpolarized or with longitudinally or transversely polarized protons. Photoproduction off neutrons was studied to determine the helicity amplitudes for the excitation of resonances off neutrons. In a partial wave analysis of the data, new resonances have been found and the properties of new and of known resonances have been determined, including the measurement of partial widths of so far unmeasured decay modes.

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“…In relation to the above issues it is worth investigating the reaction p g w  D + in parallel with the ω photoproduction on the nucleon, because the reaction is not well understood yet, with few experiments [15,16] and theories [17]. Together with the p p g w  reaction, knowledge of the reaction mechanism may help us to analyze nuclear reactions, including the study of color transparency in the nuclear photoproduction of ω.…”

Section: Introductionmentioning

confidence: 99%

“…Data are taken from Ref[8]. Beam polarization asymmetry is obtained from spin density matrix elements via using Eq (15)…”

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Features of ω photoproduction off nucleon target at forward angles: dominance of π exchange with Regge cuts and scaling of differential cross-sections

Choi²,

Kong³

2019

J. Phys. G: Nucl. Part. Phys.

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We investigate photoproduction of ω off a nucleon target γN → ωN by using a Reggeized model where π(135) + σ(500) + f1(1285) + f2(1270)+Pomeron exchanges are included in the t-channel for the reaction at forward angles. The reaction mechanism at low energy is featured by the dominance of the π exchange with the absorptive cuts introduced to modulate the pion contribution to both γp → ωp and γn → ωn reactions. Necessity of σ exchange is illustrated in the analysis of the cross section from natural parity exchanges. Cross sections for differential, total, and spin density matrix with parity and beam polarization asymmetries are reproduced and compared with existing data on γp → ωp. Scaled differential cross sections of Jefferson Lab data on γp → ωp are investigated at the production angle θ = 90 • with the nonlinear trajectories for a saturation. Differential and total cross sections for the γn → ωn reaction are analyzed to compare with recent experimental data at the CBELSA/TAPS Collaboration. An application to the γp → ω∆ + reaction is presented to demonstrate the significance of the π exchange in the total and differential cross sections. PACS numbers: 11.55.Jy, 13.40.-f, 13.60.Le for unnatural parity (P = −(−1) J ) exchanges.The Regge propagator is given bywritten in the collective form for the ϕ meson of spin-J which stands for all the mesons considered here. s 0 = 1 GeV 2 . The phase factor is, in general, taken to be of the canonical form, 1 2 [(−1) J + e −iπαJ (t) ], for each meson exchange. Photon and vector meson polarizations

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Photoproduction of π 0 ω off protons for E γ ≤3 GeV

Cited by 10 publications

References 51 publications

Partial wave analysis

Partial wave analysis

Spectroscopy of baryon resonances

Features of ω photoproduction off nucleon target at forward angles: dominance of π exchange with Regge cuts and scaling of differential cross-sections

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