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  • Measurements of the ▫$\rm \gamma^\ast p \to \Delta$▫ reaction at low ▫$\rm Q ^2$▫
    Sparveris, N. F. ...
    We report new ▫$p(e, e' p)\pi°$▫ measurements in the ▫$ \Delta^+(1232)$▫ resonance at the low momentum transfer region utilizing the magnetic spectrometers of the A1 Collaboration at MAMI. The ... mesonic cloud dynamics are predicted to be dominant and appreciably changing in this region while the momentum transfer is sufficiently low to be able to test chiral effective field theory calculations. The results disagree with predictions of constituent quark models and are in reasonable agreement with dynamical calculations with pion cloud effects, chiral effective field theory and lattice calculations. The reported measurements suggest that improvement is required to the theoretical calculations and provide valuable input that will allow their refinements.
    Source: The european physical journal. A, Hadrons and nuclei. - ISSN 1434-6001 (Vol. 49, iss. 10, 2013, 7 str.)
    Type of material - article, component part
    Publish date - 2013
    Language - english
    COBISS.SI-ID - 2615396

    Link(s):

    http://link.springer.com/article/10.1140/epja/i2013-13136-2

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