The polarization observables T , P , and H and their impact on<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:mi>γ</mml:mi><mml:mi>p</mml:mi><mml:mo stretchy="false">→</mml:mo><mml:mi>p</mml:mi><mml:msup><mml:mrow><mml:mi>π</mml:mi></mml:mrow><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msup></mml:math>multipoles

Hartmann, J.; Dutz, H.; Anisovich, A. V.; Bayadilov, D.; Beck, R.; Becker, M.; Beloglazov, Y. A.; Берлин, А. А.; Bichow, M.; Böse, S.; Brinkmann, K.-Th.; Credé, V.; Dieterle, M.; Eberhardt, H.; Elsner, D.; Fornet-Ponse, K.; Friedrich, S.; Frommberger, F.; Funke, Ch.; Gottschall, M.; Gridnev, A.; Grüner, M.; Goertz, S.; Gutz, E.; Hammann, Ch.; Hannappel, J.; Hannen, V.; Herick, J.; Hillert, W.; Hoffmeister, P.; Honisch, Christiane; Jahn, O.; Jude, T. C.; Käser, A.; Kaiser, David; Kalinowsky, H.; Kalischewski, F.; Klassen, P.; Keshelashvili, I.; Клейн, Ф.; Klempt, E.; Koop, K.; Krusche, B.; Kube, M.; Lang, Μ.; Lopatin, I.; Makónyi, K.; Messi, F.; Metag, V.; Meyer, W.; Müller, J.; Nanova, M.; Nikonov, V. A.; Novinski, D.; Novotny, R.; Piontek, D.; Reeve, S.; Rosenbaum, Ch.; Roth, Bradley J.; Reicherz, G.; Rostomyan, T.; Runkel, S.; Sarantsev, A.; Schmidt, Ch.; Schmieden, H.; Schmitz, R.; Seifen, T.; Sokhoyan, V.; Thämer, Ph.; Thiel, A.; Thoma, U.; Urban, M.; Pee, H. van; Walther, Dirk; Wendel, Ch.; Wiedner, U.; Wilson, A.; Winnebeck, A.; Witthauer, L.

doi:10.1016/j.physletb.2015.07.008

Cited by 31 publications

(42 citation statements)

References 43 publications

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“…Therefore, larger discrepancies are not surprising. The other models used recent polarization data from CBELSA/TAPS [3][4][5][6] as well as our precise cross-section data [2] in their fits. Figure 8 shows the dependence on the center-ofmomentum energy W for selected angular bins and the comparison to the model calculations.…”

Section: Resultsmentioning

confidence: 99%

“…This led to changes of some of the extracted multipole amplitudes, like E 0+ and E 1+ . An essential conclusion of [5], however, was that inclusion of the new data leads to a significantly better convergence of different fits and therefore to a less model-dependent extraction of partial-wave amplitudes. This is important because the unambiguous determination of multipoles like M 1− , M 2+ , or E 2+ is a prerequisite for the unique determination of baryon resonance parameters.…”

Section: Resultsmentioning

confidence: 99%

“…The differential cross sections for the γp → π 0 p reaction were obtained with unprecedented accuracy and full angular coverage at MAMI [2]. New measurements of beam and beam-target asymmetries were performed by the CBELSA/TAPS experiment at ELSA [3][4][5][6], the GRAAL experiment at the ESRF [7], and the CLAS experiment at JLab [8,9]. Measurements of the polarization of the recoiling proton were performed at JLab and MAMI [10,11].…”

Section: Introductionmentioning

confidence: 99%

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TandFasymmetries inπ0photoproduction on the proton

Annand¹,

Arends²,

Beck³

et al. 2016

Phys. Rev. C

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The γp → π 0 p reaction was studied at laboratory photon energies from 425 to 1445 MeV with a transversely polarized target and a longitudinally polarized beam. The beam-target asymmetry F was measured for the first time and new high precision data for the target asymmetry T were obtained. The experiment was performed at the photon tagging facility of the Mainz Microtron MAMI using the Crystal Ball and TAPS photon spectrometers. The polarized cross sections were expanded in terms of associated Legendre functions and compared to recent predictions from several partial-wave analyses. The impact of the new data on our understanding of the underlying partialwave amplitudes and baryon resonance contributions is discussed.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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TandFasymmetries inπ0photoproduction on the proton

Annand¹,

Arends²,

Beck³

et al. 2016

Phys. Rev. C

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“…To check whether the data themselves can help to reduce discrepancies in different multipole solutions, the SAID, MAID, Bonn-Gatchina and Jülich-Bonn groups teamed up to compare solutions before and after the inclusion of new high-precision π 0 photoproduction data produced at ELSA [1][2][3][4]. The quality of the fits to the new data is similar as shown in Ref.…”

Section: Introductionmentioning

confidence: 99%

“…The variance of all three PWAs summed over all γp → π 0 p multipoles up to L = 4 [5]. The range covered by the new double polarization observables [1][2][3][4] are indicated by shaded areas. Over the largest part of the energy range the new data have enforced an improvement of the overall consistency.…”

Section: Introductionmentioning

confidence: 99%

Towards Precision Spectroscopy of Baryonic Resonances

2017

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Abstract. Recent progress in baryon spectroscopy is reviewed. In a common effort, various groups have analyzed a set of new high-precision polarization observables from ELSA. The Jülich-Bonn group has finalized the analysis of pion-induced meson-baryon production, the photoproduction of pions and eta mesons, and (almost) the KΛ final state. As data become preciser, statistical aspects in the analysis of excited baryons become increasingly relevant and several advances in this direction are proposed.

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Covariance Matrix for Helicity Couplings

Sadasivan

Döring

2018

Few-Body Syst

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The polarization observables T , P , and H and their impact onγp→pπ0multipoles

Cited by 31 publications

References 43 publications

TandFasymmetries inπ0photoproduction on the proton

TandFasymmetries inπ0photoproduction on the proton

Towards Precision Spectroscopy of Baryonic Resonances

Covariance Matrix for Helicity Couplings

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