Photoproduction of neutral pions off protons

Credé, V.; Sparks, N. A.; Wilson, A.; Anisovich, A. V.; Bacelar, J. C. S.; Bantes, R.; Bartholomy, O.; Bayadilov, D.; Beck, R.; Beloglazov, Y. A.; Castelijns, R.; Dutz, H.; Elsner, D.; Ewald, R.; Frommberger, F.; Funke, Chr.; Gregor, R.; Gridnev, A.; Gutz, E.; Hillert, W.; Hoffmeister, P.; Jaeglé, I.; Junkersfeld, J.; Kalinowsky, H.; Kammer, S.; Klein, Frank; Клейн, Ф.; Klempt, E.; Kotulla, M.; Krusche, B.; Löhner, H.; Lopatin, I.; Lugert, S.; Menze, D.; Mertens, T.; Messchendorp, J. G.; Metag, V.; Nanova, M.; Nikonov, V. A.; Novinski, D.; Novotny, R.; Ostrick, M.; Pant, L. M.; Pee, H. van; Pfeiffer, M.; Roy, A.; Sarantsev, A.; Schadmand, S.; Schmidt, Ch.; Schmieden, H.; Schoch, B.; Shende, S.; Sokhoyan, V.; Suele, A.; Sumachev, V. V.; Szczepanek, T.; Thoma, U.; Trnka, D.; Varma, R.; Walther, Dirk; Wendel, Ch.

doi:10.1103/physrevc.84.055203

Cited by 26 publications

(23 citation statements)

References 128 publications

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“…7, we compare a prediction from SP09 to a fit including the data of Ref. [15]. A large discrepancy exists in the forward direction.…”

Section: Solutionmentioning

confidence: 96%

“…Cross-section [14,15], [16,17], and double-polarized C x [18] data for γp → π 0 p have had a lesser impact. For this reason, in the next section we focus mainly on the neutron target fits and multipoles.…”

Section: Databasementioning

confidence: 99%

“…CLAS data (solid circles) are from [5]. CB-ELSA data (open circles [15] and solid triangles [27]). Notation of the solutions is the same as in Fig.…”

Section: Resonance Couplingsmentioning

confidence: 99%

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Updated SAID analysis of pion photoproduction data

et al. 2012

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Energy-dependent and single-energy fits to the existing pion photoproduction database have been updated to cover the region from threshold to 2.7 GeV in the laboratory photon energy. Revised resonance photo-decay couplings have been extracted and compared to previous determinations. The influence of recent measurements is displayed. Remaining problems and future approaches are discussed.Comment: 9 pages, 6 figures, 3 table

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“…7, we compare a prediction from SP09 to a fit including the data of Ref. [15]. A large discrepancy exists in the forward direction.…”

Section: Solutionmentioning

confidence: 96%

Section: Databasementioning

confidence: 99%

See 1 more Smart Citation

Updated SAID analysis of pion photoproduction data

et al. 2012

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“…Differential cross sections for the reactions γp → π 0 p [70,71] and γp → ηp [73,74] have been measured at the beginning of the SFB, followed by additional measurements of γp → π 0 p [72] and γp → ηp and γp → η p [77] covering the full solid angle also in forward direction. Recently, differential cross sections and spin density matrix elements were determined for single ω meson photoproduction off the proton [88].…”

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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“…There has been multiple measurements of the π 0 cross-section in single pion photoproduction that can be compared to g12 measurements [14,15,16,17,18,19]. However, no experiment has produced the cross-section continuously at beam energies greater than 3 GeV.…”

Section: Comparison To Existing Datamentioning

confidence: 99%

Measurement of the π0 differential cross-section with CLAS and outlook into 12 GeV Hall C

Kunkel¹

2016

AIP Conference Proceedings

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Abstract. Photoproduction of the π 0 meson was studied using the CLAS detector at Thomas Jefferson National Accelerator Facility using tagged incident beam energies spanning the range E γ = 1.1 GeV -5.45 GeV. The measurement is performed on a liquid hydrogen target in the reaction γp → pe + e − (γ). The final state of the reaction is the sum of two subprocesses for π 0 decay, the Dalitz decay mode of π 0 → e + e − γ and conversion mode where one photon from π 0 → γγ decay is converted into a e + e − pair. This specific final state reaction avoided limitations caused by single prompt track triggering and allowed a kinematic range extension to the world data on π 0 photoproduction to a domain never systematically measured before. We report the measurement of the π 0 differential cross-sections dσ dΩ and dσ dt. The angular distributions agree well with the SAID parametrization for incident beam energies below 3 GeV, while an interpretation of the data for incident beam energies greater than 3 GeV is currently being developed. Included in the report will be a discussion of the future wide angle, exclusive photoproduction of π 0 experiment that will be performed in Hall C.

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Photoproduction of neutral pions off protons

Abstract: Photoproduction of neutral pions has been studied with the CBELSA/TAPS detector in the reaction γp → pπ

Cited by 26 publications

References 128 publications

Updated SAID analysis of pion photoproduction data

Updated SAID analysis of pion photoproduction data

Spectroscopy of baryon resonances

Measurement of the π0 differential cross-section with CLAS and outlook into 12 GeV Hall C

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