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Polarization observables in double neutral pion photoproduction

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arxiv 2207.01981 v3 pith:VHDYCHP2 submitted 2022-07-05 nucl-ex

CBELSA/TAPS Collaboration: T. Seifen , J. Hartmann , F. Afzal , A.V. Anisovich , R. Beck , M. Becker , A. Berlin , M. Bichow
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K.-Th. Brinkmann V. Crede M. Dieterle H. Dutz H. Eberhardt D. Elsner K. Fornet-Ponse St. Friedrich F. Frommberger Ch. Funke M. Gottschall M. Grüner St. Görtz E. Gutz Ch. Hammann J. Hannappel J. Herick W. Hillert Ph. Hoffmeister Ch. Honisch O. Jahn T. Jude A. Käser D. Kaiser H. Kalinowsky F. Kalischewski P. Klassen I. Keshelashvili F. Klein E. Klempt K. Koop B. Krusche M. Lang Ph. Mahlberg K. Makonyi F. Messi V. Metag W. Meyer J. Müller J. Müllers M. Nanova K. Nikonov V.A. Nikonov R. Novotny S. Reeve B. Roth G. Reicherz T. Rostomyan St. Runkel A.V. Sarantsev Ch. Schmidt H. Schmieden R. Schmitz J. Schultes V. Sokhoyan N. Stausberg A. Thiel U. Thoma M. Urban G. Urff H. van Pee D. Walther Ch. Wendel U. Wiedner A. Wilson L. Witthauer Y. Wunderlich
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abstract

Measurements of target asymmetries and double-polarization observables for the reaction $\gamma p\to p\pi^0\pi^0$ are reported. The data were taken with the CBELSA/TAPS experiment at the ELSA facility (Bonn University) using the Bonn frozen-spin butanol (C$_4$H$_9$OH) target, which provided transversely polarized protons. Linearly polarized photons were produced via bremsstrahlung off a diamond crystal. The data cover the photon energy range from $E_{\gamma}$=650 MeV to $E_{\gamma}$=2600 MeV and nearly the complete angular range. The results have been included in the BnGa partial wave analysis. Experimental results and the fit agree very well. Observed systematic differences in the branching ratios for decays of $N^*$ and $\Delta^*$ resonances are attributed to the internal structure of these excited nucleon states. Resonances which can be assigned to SU(6)$\times$O(3) two-oscillator configurations show larger branching ratios to intermediate states with non-zero intrinsic orbital angular momenta than resonances assigned to one-oscillator configurations.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Measurement of single- and double-polarization observables in the photoproduction of $\pi^+\pi^-$~meson pairs off the proton using CLAS at Jefferson Laboratory

    nucl-ex 2025-04 conditional novelty 7.0 of 10

    First measurements of eight single- and double-polarization observables in gamma p to p pi+ pi- at W around 1.51-2.04 GeV with a Bonn-Gatchina partial-wave analysis.

  2. Photoproduction of two charged pions off protons in the resonance region

    nucl-ex 2024-11 conditional novelty 6.0 of 10

    A new event-based likelihood analysis of gamma p to pi+ pi- p CLAS data gives cross sections, spin-density matrix elements, and N rho(770) branching fractions for many N* and Delta* resonances.

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