Forward photoproduction of neutral pions from protons in the resonance region

Brefeld, W.; Husmann, D.; Jansen, Walter; Löhr, B.; Reichmann, K.; Schilling, H.

doi:10.1016/0550-3213(75)90226-6

Cited by 8 publications

(4 citation statements)

References 16 publications

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“…As an example, figure 17 shows some of the available data for a large energy range from 1.0 to system: θ ≈ 148 • (left) and θ ≈ 41 • (right). Data are from CLAS [136], CB-ELSA [145,146], CBELSA/TAPS • [162], Becks et al [283], and Brefeld et al [284]. Statistical and systematic errors have been added in quadrature.…”

Section: Photoproduction Of a Single π Mesonmentioning

confidence: 99%

Progress towards understanding baryon resonances

2013

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Abstract. The composite nature of baryons manifests itself in the existence of a rich spectrum of excited states, in particular in the important mass region 1-2 GeV for the light-flavoured baryons. The properties of these resonances can be identified by systematic investigations using electromagnetic and strong probes, primarily with beams of electrons, photons, and pions. After decades of research, the fundamental degrees of freedom underlying the baryon excitation spectrum are still poorly understood. The search for hitherto undiscovered but predicted resonances continues at many laboratories around the world. Recent results from photo-and electroproduction experiments provide intriguing indications for new states and shed light on the structure of some of the known nucleon excitations. The continuing study of available data sets with consideration of new observables and improved analysis tools have also called into question some of the earlier findings in baryon spectroscopy. Other breakthrough measurements have been performed in the heavy-baryon sector, which has seen a fruitful period in recent years, in particular at the B factories and the Tevatron. First results from the LHC indicate rapid progress in the field of bottom baryons. In this review, we discuss the recent experimental progress and give an overview of theoretical approaches.

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Section: Photoproduction Of a Single π Mesonmentioning

confidence: 99%

Progress towards understanding baryon resonances

2013

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“…Cross section data for π 0 photoproduction were obtained and studied at many different laboratories over a wide kinematic range [2][3][4][6][7][8][9][10][11][12][13][14][15][16][17][18]. A review of the main data sets published before 2005 and a corresponding comparison of their coverage in energy and solid angle can be found in Ref.…”

Section: Previous Resultsmentioning

confidence: 99%

“…The data points include statistical errors only; the total systematic error is given as error bands at the bottom of each plot. [18] (open green triangles). The dashed lines represent the current SAID solution (SP09) [30], and the solid lines represent the latest solution of the Bonn-Gatchina PWA [29], which includes the new data presented here.…”

Section: B Systematic Uncertaintiesmentioning

confidence: 99%

“…The angle shown is the pion center-of-mass scattering angle. The experimental data are from the CBELSA/TAPS measurements presented here (filled circles •), CB-ELSA[2] (open stars ✩), GRAAL (left)[15] (open boxes ), SPring-8 (center and right)[16] (open boxes ), CLAS[4] (open circles •), Althoff et al (left)[17] (open triangles △), and Brefeld et al (right)[18] (open triangles △). The dashed lines represent the current SAID solution (SP09)[30], and the solid lines represent the latest solution of the Bonn-Gatchina PWA[29], which includes the new data presented here.…”

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confidence: 99%

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