کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9860900 | 1528973 | 2005 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Intermediate resonance excitation in the γpâpÏ0Ï0 reaction
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک هسته ای و انرژی بالا
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The helicity dependence of the total cross section for the γâpââpÏ0Ï0 reaction has been measured for the first time at incident photon energies from 400 to 800 MeV. The measurement, performed at the tagged photon beam facility of the MAMI accelerator in Mainz, used the large acceptance detector DAPHNE and a longitudinally polarized frozen-spin target. This channel is found to be excited predominantly when the photon and proton have a parallel spin orientation, most likely due to the intermediate production of the D13(1520) resonance. However, the contribution of the antiparallel spin configuration, arising from other reaction mechanisms, is also not negligible. This result gives important new information to resolve the existing model discrepancies in the identification of the nucleon resonances contributing to this channel.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physics Letters B - Volume 624, Issues 3â4, 29 September 2005, Pages 173-180
Journal: Physics Letters B - Volume 624, Issues 3â4, 29 September 2005, Pages 173-180
نویسندگان
GDH Collaboration GDH Collaboration, A2 Collaboration A2 Collaboration, J. Ahrens, S. Altieri, J.R.M. Annand, G. Anton, H.-J. Arends, K. Aulenbacher, R. Beck, C. Bradtke, A. Braghieri, N. Degrande, N. d'Hose, H. Dutz, S. Goertz, P. Grabmayr, K. Hansen,