First measurement of the helicity dependence for the gamma p → p Pi(+)pi(-) reaction
The European physical journal : A. Bd. 34. H. 1. Berlin: Springer 2007 S. 11 - 21
Erscheinungsjahr: 2007
ISBN/ISSN: 1434-6001 ; 1434-601X
Publikationstyp: Zeitschriftenaufsatz
Sprache: Englisch
Doi/URN: 10.1140/epja/i2007-10491-5
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Inhaltszusammenfassung
The helicity dependence of the total cross-section and the invariant-mass distributions in the (p pi(+/-)) and (pi(+) pi(-)) final states for the gamma p -> p pi(+)pi(-) reaction have been measured for the first time at incident photon energies from 400 to 800MeV. The measurement was performed with the large-acceptance detector DAPHNE at the tagged photon beam facility of the MAMI accelerator in Mainz. Although this channel is found to be predominantly excited by the intermediate production o...The helicity dependence of the total cross-section and the invariant-mass distributions in the (p pi(+/-)) and (pi(+) pi(-)) final states for the gamma p -> p pi(+)pi(-) reaction have been measured for the first time at incident photon energies from 400 to 800MeV. The measurement was performed with the large-acceptance detector DAPHNE at the tagged photon beam facility of the MAMI accelerator in Mainz. Although this channel is found to be predominantly excited by the intermediate production of a Delta pi state, both the measured unpolarized and the helicity-dependent observables are generally not well described by the existing theoretical models.» weiterlesen» einklappen
Autoren
Klassifikation
DFG Fachgebiet:
Teilchen, Kerne und Felder
DDC Sachgruppe:
Physik
