Recoil Polarization and Beam-Recoil Double Polarization Measurement of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>η</mml:mi></mml:math>Electroproduction on the Proton in the Region of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>S</mml:mi><mml:mn>11</mml:mn></mml:msub><mml:mo stretchy="false">(</mml:mo><mml:mn>1535</mml:mn><mml:mo stretchy="false">)</mml:mo></mml:math>Resonance

Merkel, H.; Achenbach, P.; Gayoso, C. Ayerbe; Bernauer, J. C.; Böhm, R.; Bosnar, D.; Cheymol, B.; Distler, M. O.; Doria, L.; Fonvieille, H.; Jm, Friedrich; Janssens, Peter; Makek, M.; Müller, U.; Nungesser, L.; Pochodzalla, J.; Potokar, M.; Majos, S. Sánchez; Schlimme, B. S.; Širca, S.; Tiator, L.; Walcher, Th.; Weinriefer, M.

doi:10.1103/physrevlett.99.132301

Cited by 16 publications

(5 citation statements)

References 30 publications

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“…The model independent, truncated multipole analysis [14] showed that this feature enforced a large and rapidly varying phase between the E 0þ and the E 2− , M 2− multipoles. This phase was later supported by a measurement of the proton recoil polarization in the pðe; e 0p Þη reaction [15]. However, such a strong phase motion is not possible between amplitudes dominated by two Breit-Wigner resonances with very close pole positions, the N ⋆ ð1535Þ1=2 − and the N ⋆ ð1520Þ3=2 − resonances.…”

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confidence: 78%

Measurement of the Transverse Target and Beam-Target Asymmetries inηMeson Photoproduction at MAMI

Akondi¹,

Annand²,

Arends³

et al. 2014

Phys. Rev. Lett.

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We present new data for the transverse target asymmetry T and the very first data for the beam-target asymmetry F in theγp → ηp reaction up to a center-of-mass energy of W ¼ 1.9 GeV. The data were obtained with the Crystal-Ball/TAPS detector setup at the Glasgow tagged photon facility of the Mainz Microtron MAMI. All existing model predictions fail to reproduce the new data indicating a significant impact on our understanding of the underlying dynamics of η meson photoproduction. The peculiar nodal structure observed in existing T data close to threshold is not confirmed.

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mentioning

confidence: 78%

Measurement of the Transverse Target and Beam-Target Asymmetries inηMeson Photoproduction at MAMI

Akondi¹,

Annand²,

Arends³

et al. 2014

Phys. Rev. Lett.

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“…In standard analysis methods [2,[7][8][9], eq. (2.7) is solved numerically, with arbitrary initial guess solutions.…”

Section: Exact Formalismmentioning

confidence: 99%

Polar polarization: a new method for polarimetry analysis

et al. 2018

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A: We present a novel analysis method for measurements of polarization transferred in A( ì e, e ì N) experiments, which can be applied to other kinds of polarization measurements as well. In this method the polarization transfer components are presented in spherical coordinates using an efficient likelihood numerical maximization based on an analytic derivation. We also propose a formalism that accounts for multi-parameter models, and which yields a smooth and continuous representation of the data (rather than using standard binning). Applying this method on simulated data generates results with reduced statistical and systematic uncertainties and enables revealing physical information that is lost in standard binning of the data. The obtained results can be compared easily to theoretical models and other measurements. Furthermore, CPU time is significantly reduced using this method.

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“…Electroproduction experiments, e.g., by the CLAS Collaboration at JLab, are producing a wealth of data that, in many cases, still await a detailed analysis, in pion electroproduction [111][112][113][114] (JLab), [115] (A1 Collaboration at MAMI), η electroproduction [116] (JLab), [117] (A1 Collaboration at MAMI), and kaon electroproduction [3] (A2 Collaboration), [118] (JLab). It should also be stressed that pion and kaon electroproduction experiments with the new CLAS12 detector at the 12 GeV upgrade of Jefferson Lab [10,119] will provide many data that require a timely analysis.…”

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confidence: 99%

Jülich-Bonn-Washington Model for Pion Electroproduction Multipoles

Mai,

Döring,

Granados

et al. 2021

Preprint

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Pion electroproduction off the proton is analyzed in a new framework based on a general parametrization of transition amplitudes, including constraints from gauge invariance and threshold behavior. Data with energies 1.13 GeV < W < 1.6 GeV and Q 2 below 6 GeV 2 are included. The model is an extension of the latest Jülich-Bonn solution incorporating constraints from pion-induced and photoproduction data. Performing large scale fits (∼ 10 5 data) we find a set of solutions with χ 2 dof = 1.69 − 1.81 which allows us to assess the systematic uncertainty of the approach.

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Recoil Polarization and Beam-Recoil Double Polarization Measurement ofηElectroproduction on the Proton in the Region of theS11(1535)Resonance

Cited by 16 publications

References 30 publications

Measurement of the Transverse Target and Beam-Target Asymmetries inηMeson Photoproduction at MAMI

Measurement of the Transverse Target and Beam-Target Asymmetries inηMeson Photoproduction at MAMI

Polar polarization: a new method for polarimetry analysis

Jülich-Bonn-Washington Model for Pion Electroproduction Multipoles

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