Measurement of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msup><mml:mi>π</mml:mi><mml:mn>0</mml:mn></mml:msup></mml:math>photoproduction on the proton at MAMI C

Adlarson, P.; Afzal, F.; Akondi, C. S.; Annand, J. R. M.; Arends, H. J.; Azimov, Ya. I.; Beck, R.; Borisov, N. S.; Braghieri, A.; Briscoe, W. J.; Cherepnya, S.; Cividini, F.; Collicott, C.; Costanza, S.; Denig, A.; Downie, E. J.; Dieterle, M.; Bondy, M. I. Ferretti; Filʼkov, L.V.; Fix, A.; Gardner, S.; Garni, S.; Glazier, D. I.; Glowa, D.; Gradl, W.; Gurevich, G. M.; Hamilton, D.; Hornidge, D.; Huber, G. M.; Käser, A.; Kashevarov, V. L.; Kay, S.; Keshelashvili, I.; Kondratiev, R.; Korolija, M.; Krusche, B.; Kulikov, V.; Lazarev, A. B.; Linturi, J. M.; Lisin, V.; Livingston, K.; MacGregor, I. J. D.; Manley, D. M.; Martel, P. P.; Martemianov, M.; McGeorge, J. C.; Meyer, W.; Middleton, D. G.; Miskimen, R.; Mushkarenkov, A.; Neganov, A. B.; Neiser, A.; Oberle, M.; Ostrick, M.; Ott, P. S.; Otte, P. B.; Oussena, B.; Paudyal, D.; Pedroni, P.; Polonski, A.; Polyanski, V. V.; Prakhov, S.; Rajabi, A. A.; Reicherz, G.; Ron, G.; Rostomyan, T.; Sarty, A. J.; Schott, D.; Schumann, S.; Sfienti, C.; Sokhoyan, V.; Spieker, K.; Steffen, O.; Strakovsky, I. I.; Strub, Th.; Supek, I.; Taragin, M. F.; Thiel, A.; Thiel, M.; Tiator, L.; Thomas, A.; Unverzagt, M.; Usov, Yu. A.; Wagner, S.R.; Watts, D. P.; Werthmüller, D.; Wettig, J.; Witthauer, L.; Wolfes, M.; Workman, R. L.; Zana, L.

doi:10.1103/physrevc.92.024617

Cited by 41 publications

(28 citation statements)

References 103 publications

(29 reference statements)

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“…Bonn-Gatchina (BnGa) uses a K-matrix formalism with Breit-Wigner resonances and includes πN → πN , γN → ππN , as well as channels ηN , KΛ, and KΣ. The GWU/SAID model is also based on a K-matrix approach that focuses on analyses of πN → πN [10] and γN → πN [11], but more recent efforts have allowed the inclusion of πN → ηN as well.…”

Section: Introductionmentioning

confidence: 99%

Updated determination of N* resonance parameters using a unitary, multichannel formalism

Hunt

Manley

2019

Phys. Rev. C

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Results are presented for an updated multichannel energy-dependent partial-wave analysis of πN scattering. Our earlier work incorporated single-energy amplitudes for πN → πN , γN → πN , πN → ππN , πN → ηN , and πN → KΛ. The present work incorporates new single-energy solutions for γp → ηp up to a c.m. energy of 1990 MeV, γp → K + Λ up to a c.m. energy of 2230 MeV, and γn → ηn up to a c.m. energy of 1885 MeV, as well as updated single-energy solutions for πN → ηN , πN → KΛ, and γN → πN . In this paper, we present and discuss the resonance parameters obtained from a combined fit of all these single-energy amplitudes. Our determined energy-dependent amplitudes provide an excellent description of the corresponding measured observables.

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Section: Introductionmentioning

confidence: 99%

Updated determination of N* resonance parameters using a unitary, multichannel formalism

Hunt

Manley

2019

Phys. Rev. C

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“…The Glasgow-Mainz tagger [28] was used in the major part of the experiments. In order to tag the highenergy part of the bremsstrahlung spectrum, a dedicated end-point tagging spectrometer (EPT) [29] was used, especially designed for η 0 measurements. In this Letter, the analysis of three independent data sets from different periods of data taking is presented.…”

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confidence: 99%

Study of η and η′ Photoproduction at MAMI

Kashevarov¹,

Ott²,

Prakhov³

et al. 2017

Phys. Rev. Lett.

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The reactions γp → ηp and γp → η 0 p are measured from their thresholds up to the center-of-mass energy W ¼ 1.96 GeV with the tagged-photon facilities at the Mainz Microtron, MAMI. Differential cross sections are obtained with unprecedented statistical accuracy, providing fine energy binning and full production-angle coverage. A strong cusp is observed in the total cross section for η photoproduction at the energies in the vicinity of the η 0 threshold, W ¼ 1896 MeV (E γ ¼ 1447 MeV). Within the framework of a revised ηMAID isobar model, the cusp, in connection with a steep rise of the η 0 total cross section from its threshold, can only be explained by a strong coupling of the poorly known Nð1895Þ1=2 − state to both ηp and η 0 p. Including the new high-accuracy results in the ηMAID fit to available η and η 0 photoproduction data allows the determination of the Nð1895Þ1=2 − properties.

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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%

“…[31] H 157 1462 − 1620 8 CBELSA/TAPS(2014) [29] In general, there is a hierarchy of precision depending on the polarization degrees of freedom used in the experiment. The highest precision was achieved in measurements of the unpolarized differential cross section at MAMI [22]. The statistical uncertainties are so small, that systematic uncertainties due to angular dependent detection efficiencies had to be taken into account.…”

Section: Formalismmentioning

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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Measurement ofπ0photoproduction on the proton at MAMI C

Cited by 41 publications

References 103 publications

Updated determination of N* resonance parameters using a unitary, multichannel formalism

Updated determination of N* resonance parameters using a unitary, multichannel formalism

Study of η and η′ Photoproduction at MAMI

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

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