On hadron deformation: A model independent extraction of EMR from pion photoproduction data View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2018-07

AUTHORS

L. Markou, E. Stiliaris, C. N. Papanicolas

ABSTRACT

The multipole content of pion photoproduction at the Δ+(1232) resonance has been extracted from a data set dominated by recent Mainz Microtron (MAMI) precision measurements. The analysis has been carried out in the Athens Model Independent Analysis Scheme (AMIAS), thus eliminating any model bias. The benchmark quantity for nucleon deformation, EMR = E2/M1 = E1+3/2/M1+3/2, was determined to be -2.5±0.4stat+syst, thus reconfirming in a model independent way that the conjecture of baryon deformation is valid. The derived multipole amplitudes provide stringent constraints on QCD simulations and QCD inspired models striving to describe the hadronic structure. They are in good agreement with phenomenological models which explicitly incorporate pionic degrees of freedom and with lattice QCD calculations. More... »

PAGES

115

References to SciGraph publications

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  • 2004-08. Helicity dependence of the channels and multipole analysis in the region in THE EUROPEAN PHYSICAL JOURNAL A
  • 2005-10. Measurement of the G asymmetry for the γp↦Nπ channels in the Δ(1232) resonance region in THE EUROPEAN PHYSICAL JOURNAL A
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  • 2006-05. Experiments with photons at MAMI in THE EUROPEAN PHYSICAL JOURNAL A
  • Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1140/epja/i2018-12549-7

    DOI

    http://dx.doi.org/10.1140/epja/i2018-12549-7

    DIMENSIONS

    https://app.dimensions.ai/details/publication/pub.1105411558


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