First measurement of the helicity dependence for the γp → pπreaction

J. Ahrens, S. Altieri, J. R.M. Annand, H. J. Arends, R. Beck, M. A. Blackston, C. Bradtke, A. Braghieri, N. D'Hose, H. Dutz, A. Fix, S. Goertz, P. Grabmayr, S. Hasegawa, E. Heid, H. Holvoet, N. Horikawa, T. Iwata, O. Jahn, P. JenneweinF. Klein, R. Kondratiev, M. Lang, B. Lannoy, V. Lisin, M. Martinez-Fabregate, J. C. McGeorge, W. Meyer, A. Panzeri, P. Pedroni, T. Pinelli, I. Preobrajenski, G. Reicherz, Ch Rohlof, G. Rosner, M. Rost, T. Rostomyan, D. Ryckbosch, M. Schumacher, B. Seitz, G. Tamas, A. Thomas, R. Van De Vyver, H. R. Weller, F. Zapadtka

Результат исследований: Материалы для журналаСтатья

25 Цитирования (Scopus)


The helicity dependence of the total cross-section and the invariant-mass distributions in the (pπ±) and (π+π -) final states for the γp → pπ+π - 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 Δπ state, both the measured unpolarized and the helicity-dependent observables are generally not well described by the existing theoretical models.

Язык оригиналаАнглийский
Страницы (с-по)11-21
Число страниц11
ЖурналEuropean Physical Journal A
Номер выпуска1
СостояниеОпубликовано - 1 окт 2007


ASJC Scopus subject areas

  • Nuclear and High Energy Physics


Ahrens, J., Altieri, S., Annand, J. R. M., Arends, H. J., Beck, R., Blackston, M. A., Bradtke, C., Braghieri, A., D'Hose, N., Dutz, H., Fix, A., Goertz, S., Grabmayr, P., Hasegawa, S., Heid, E., Holvoet, H., Horikawa, N., Iwata, T., Jahn, O., ... Zapadtka, F. (2007). First measurement of the helicity dependence for the γp → pπreaction. European Physical Journal A, 34(1), 11-21.