Accurate Test of Chiral Dynamics in the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mover accent="true"><mml:mi>γ</mml:mi><mml:mo>→</mml:mo></mml:mover><mml:mi>p</mml:mi><mml:mo>→</mml:mo><mml:msup><mml:mi>π</mml:mi><mml:mn>0</mml:mn></mml:msup><mml:mi>p</mml:mi></mml:math>Reaction

Hornidge, D.; Bartolome, P. A.; Annand, J. R. M.; Arends, H. J.; Beck, R.; Bekrenev, V.; Berghäuser, H.; Bernstein, A. M.; Braghieri, A.; Briscoe, W. J.; Cherepnya, S.; Dieterle, M.; Downie, E. J.; Drexler, P.; Fernández-Ramírez, C.; Filʼkov, L.V.; Glazier, D. I.; Barrientos, Pauline Hall; Heid, E.; Hilt, M.; Jaeglé, I.; Jahn, O.; Jude, T. C.; Kashevarov, V. L.; Keshelashvili, I.; Kondratiev, R.; Korolija, M.; Koulbardis, A.; Krambrich, D.; Kruglov, S. P.; Krusche, B.; Laffoley, A. T.; Lisin, V.; Livingston, K.; MacGregor, I. J. D.; Mancell, J.; Manley, D. M.; McNicoll, E. F.; Mekterović, D.; Metag, V.; Mićanović, Saša; Middleton, D. G.; Moores, Korwin; Mushkarenkov, A.; Nefkens, B. M. K.; Oberle, M.; Ostrick, M.; Otte, P. B.; Oussena, B.; Pedroni, P.; Pheron, F.; Polonski, A.; Prakhov, S.; Robinson, J.; Rostomyan, T.; Scherer, Stefan; Schumann, S.; Sikora, M. H.; Starostin, A.; Supek, I.; Thiel, M.; Thomas, A.; Tiator, L.; Unverzagt, M.; Watts, D. P.; Werthmüller, D.; Witthauer, L.

doi:10.1103/physrevlett.111.062004

Cited by 41 publications

(32 citation statements)

References 95 publications

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“…1. The recent new data include measurements of the beam asymmetry Σ [94,95], on T, P and H [96], G [38,97], and E [37,98] for the reaction γp → π 0 p. For the reaction γp → π + n, new data are available on the beam asymmetry Σ [95]. These data are (mostly) not used in the predictions.…”

Section: Data Used In the Analysismentioning

confidence: 99%

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The impact of new polarization data from Bonn, Mainz and Jefferson Laboratory on $\gamma p \rightarrow \pi N$ multipoles

et al. 2016

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New data on pion-photoproduction off the proton have been included in the partial wave analyses Bonn-Gatchina and SAID and in the dynamical coupled-channel approach Jülich-Bonn. All reproduce the recent new data well: the double polarization data for E, G, H, P and T in γp → π 0 p from ELSA, the beam asymmetry Σ for γp → π 0 p and π + n from Jefferson Laboratory, and the precise new differential cross section and beam asymmetry data Σ for γp → π 0 p from MAMI. The new fit results for the multipoles are compared with predictions not taking into account the new data. The mutual agreement is improved considerably but still far from being perfect.

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Section: Data Used In the Analysismentioning

confidence: 99%

“…Data on πN and ηp (and K + Λ) are fitted independently. (1 st row), for the beam asymmetry Σ in the low-energy region [94] and at higher energies (2 nd row) for γp → π 0 p, (2 nd and 3 rd row). The next three rows show T [96], G [38,97], and E [37,98] for γp → π 0 p. Note that the data from Refs.…”

Section: Maidmentioning

confidence: 99%

The impact of new polarization data from Bonn, Mainz and Jefferson Laboratory on $\gamma p \rightarrow \pi N$ multipoles

et al. 2016

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“…In addition to the unpolarized differential cross section, the observables group into single-polarization measurements which comprise three additional quantities, as well as 12 double-polarization observables that may be extracted by beam-target (BT), beam-recoil (BR) and target-recoil (TR) measurements. The most recent experimental activities center around the facilities ELSA at Bonn [7,9,11,12,14]), MAMI at Mainz [16,17,18,19] and JLab at Newport News [22]. With the modern technical developments like polarized beams and Table 1.…”

Section: Introductionmentioning

confidence: 99%

Determining the dominant partial wave contributions from angular distributions of single- and double-polarization observables in pseudoscalar meson photoproduction

Wunderlich¹,

Afzal²,

Thiel³

et al. 2017

Eur. Phys. J. A

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This work presents a simple method to determine the significant partial wave contributions to experimentally determined observables in pseudoscalar meson photoproduction. First, fits to angular distributions are presented and the maximum orbital angular momentum Lmax needed to achieve a good fit is determined. Then, recent polarization measurements for γp → π 0 p from ELSA, GRAAL, JLab and MAMI are investigated according to the proposed method. This method allows us to project high-spin partial wave contributions to any observable as long as the measurement has the necessary statistical accuracy. We show, that high precision and large angular coverage in the polarization data are needed in order to be sensitive to high-spin resonance-states and thereby also for the finding of small resonance contributions. This task can be achieved via interference of these resonances with the well-known states. For the channel γp → π 0 p, those are the N (1680) + , contributing to the F -waves.

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“…The majority of experimental data on the γp → π 0 p reaction were obtained with energy-tagged photon beams and large solid angle electromagnetic calorimeters with a high efficiency for a detection of the 2 photons from the π 0 → γγ decay. We used data from the A2 Collaboration at the Mainz Microtron MAMI [12,13,[22][23][24][25][26][27][28], the CBELSA/TAPS Collaboration at ELectron Stretcher and Accelerator ELSA [29][30][31] and the GRAAL Detector at the European Synchrotron Radiation Facility [32]. A summary is given in Table I.…”

Section: Formalismmentioning

confidence: 99%

“…In the simple case of pion production close to threshold and in the energy region of the ∆(1232) resonance where only a few partial waves contribute and unitarity provides strong constraints in the form of Watson's theorem [10] model independent multipole analyses were possible [11][12][13][14]. However, in all analyses at higher energies, the fits were constrained to a parametrization of the amplitudes given by a preferred reaction model (e.g.…”

Section: Introductionmentioning

confidence: 99%

Single-energy partial wave analysis for π0 photoproduction on the proton with fixed- t analyticity imposed

et al. 2019

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High precision data of the γp → π 0 p reaction from its threshold up to W = 2 GeV have been used in order to perform a single-energy partial wave analysis with minimal model dependence. Continuity in energy was achieved by imposing constraints from fixed-t analyticity in an iterative procedure. Reaction models were only used as starting point in the very first iteration. We demonstrate that with this procedure partial wave amplitudes can be obtained which show only a minimal dependence on the initial model assumptions. * hedim.osmanovic@untz.ba

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Accurate Test of Chiral Dynamics in theγ→p→π0pReaction

Cited by 41 publications

References 95 publications

The impact of new polarization data from Bonn, Mainz and Jefferson Laboratory on $\gamma p \rightarrow \pi N$ multipoles

The impact of new polarization data from Bonn, Mainz and Jefferson Laboratory on $\gamma p \rightarrow \pi N$ multipoles

Determining the dominant partial wave contributions from angular distributions of single- and double-polarization observables in pseudoscalar meson photoproduction

Single-energy partial wave analysis for π0 photoproduction on the proton with fixed- t analyticity imposed

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