Compton Scattering at Graal

Bartalini, O.; Bellini, V.; BOCQUET, J.P.; Capogni, M.; Castoldi, M.; D’Angelo, A.; d’Angelo, A.; Didélez, J. P.; Salvo, R. Di; Fantini, A; Gervino, G.; Ghio, F.; Girolami, B.; Guidal, M.; Hourany, E.; Kilvington, I.; Kunne, R.; Kuznetsov, V.; Lapik, A.; Sandri, P. Levi; LLERES, A.; Moricciani, D.; Nedorezov, V.; NICOLETTI, L.; REBREYEND, D.; RENARD, F.; Rudnev, N.; Schaerf, C.; Sperduto, M. L.; Sutera, M. C.; Turinge, A.; Zucchiatti, A.

doi:10.1142/9789812705167_0048

Cited by 3 publications

(6 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The results for the reaction γp → nπ + CLAS beam asymmetries (386 data points shown as filled circles) are compared in Fig. 10 to previous data from GRAAL [25] (open squares), Yerevan [26] (open triangles), CEA [21] (filled squares), and DNPL [23] (crosses). Only those world data that are within ±3 MeV of the CLAS photon energies E γ are shown.…”

Section: Resultsmentioning

confidence: 99%

“…The π + data obtained here tend to agree well with the previous data except for a few points. Out of the 34 points from GRAAL, easily identifiable differences between GRAAL [25] and CLAS occur for four with E γ = 1148 MeV (θ = 114 • , 122 • , 145 • , and 150 • ), along with a single point at E γ = 1400 (θ = 90 • ). The single CEA [21] point at E γ = 1400 MeV (θ = 90 • ) is systematicaly low when compared to CLAS.…”

Section: Resultsmentioning

confidence: 99%

“…which for m = 0, reduces to the familiar form for a Poisson distributed random variable divided by a constant [29]) predictions. Experimental data are from the current (filled circles), GRAAL [25] (open square), Yerevan [26] (open triangle), CEA [21] (filled square), and DNPL [23] (cross). Plotted uncertainties are statistical.…”

Section: Statistical Uncertaintymentioning

confidence: 99%

See 2 more Smart Citations

Beam asymmetryΣforπ+andπ0photoproduction on the proton for photon energies from 1.102 to 1.862 GeV

Dugger¹,

Ritchie²,

Collins³

et al. 2013

Phys. Rev. C

Self Cite

View full text Add to dashboard Cite

Dugger, M. et al. (2013) Beam asymmetry Σ for π+ and π0 photoproduction on the proton for photon energies from 1.102 to 1.862 GeV. Physical Review C, 88 (6). Art. 065203. ISSN 0556-2813 Copyright © 2013 American Physical Society.A copy can be downloaded for personal non-commercial research or study, without prior permission or chargeThe content must not be changed in any way or reproduced in any format or medium without the formal permission of the copyright holder(s) When referring to this work, full bibliographic details must be given Beam asymmetries for the reactions γp → pπ 0 and γp → nπ + have been measured with the CEBAF Large Acceptance Spectrometer (CLAS) and a tagged, linearly polarized photon beam with energies from 1.102 to 1.862 GeV. A Fourier moment technique for extracting beam asymmetries from experimental data is described. The results reported here possess greater precision and finer energy resolution than previous measurements. Our data for both pion reactions appear to favor the SAID and Bonn-Gatchina scattering analyses over the older Mainz MAID predictions. After incorporating the present set of beam asymmetries into the world database, exploratory fits made with the SAID analysis indicate that the largest changes from previous fits are for properties of the ∆(1700)3/2 − and ∆(1905)5/2 + states.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Beam asymmetryΣforπ+andπ0photoproduction on the proton for photon energies from 1.102 to 1.862 GeV

Dugger¹,

Ritchie²,

Collins³

et al. 2013

Phys. Rev. C

Self Cite

View full text Add to dashboard Cite

show abstract

“…Beam asymmetry of the reaction γp → π 0 p. Dashed (blue) line: fit 1 (prediction); solid (red) line: fit 2; data: DU13[118] (CLAS). Beam asymmetry of the reaction γp → π + n. Dashed (blue) line: fit 1; solid (red) line: fit 2; data: BL01[165] (LEGS), BE00[157] (MAMI), AJ00[169] (GRAAL), BT02[170] (GRAAL).…”

mentioning

confidence: 99%

Photocouplings at the pole from pion photoproduction

et al. 2014

View full text Add to dashboard Cite

The reactions γp → π 0 p and γp → π + n are analyzed in a semi-phenomenological approach up to E ∼ 2.3 GeV. Fits to differential cross section and single and double polarization observables are performed. A good overall reproduction of the available photoproduction data is achieved. The Jülich2012 dynamical coupled-channel model -which describes elastic πN scattering and the world data base of the reactions πN → ηN , KΛ, and KΣ at the same time -is employed as the hadronic interaction in the final state. The framework guarantees analyticity and, thus, allows for a reliable extraction of resonance parameters in terms of poles and residues. In particular, the photocouplings at the pole can be extracted and are presented.

show abstract

“…Results on cross section measurements were recently reported for pπ 0 [184], pη [185,186], pω [187], pπ 0 π 0 [188], and nπ 0 π 0 [189]. Results on beam asymmetries for a large variety of reactions can be found in [184,187,188,189,190,191,192,193,194,195,196].…”

Section: Beammentioning

confidence: 93%

Progress towards understanding baryon resonances

2013

View full text Add to dashboard Cite

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.

show abstract

Compton Scattering at Graal

Cited by 3 publications

References 0 publications

Beam asymmetryΣforπ+andπ0photoproduction on the proton for photon energies from 1.102 to 1.862 GeV

Beam asymmetryΣforπ+andπ0photoproduction on the proton for photon energies from 1.102 to 1.862 GeV

Photocouplings at the pole from pion photoproduction

Progress towards understanding baryon resonances

Contact Info

Product

Resources

About