کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8195192 | 1528911 | 2008 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
New results on the Roper resonance and the P11 partial wave
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موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک هسته ای و انرژی بالا
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Properties of the Roper resonance, the first scalar excitation of the nucleon, are determined. Pole positions and residues of the P11 partial wave are studied in a combined analysis of pion- and photo-induced reactions. We find the Roper pole at {(1371±7)âi(92±10)}MeV and an elasticity of 0.61±0.03. The largest decay coupling is found for the NÏ (Ï=(ÏÏ)-S-wave). The analysis is based on new data on γpâpÏ0Ï0 for photons in the energy range from the two-pion threshold to 820 MeV from TAPS at Mainz and from 0.4 to 1.3 GeV from Crystal Barrel at Bonn and includes further data from other experiments. The partial wave analysis excludes the possibility that the Roper resonance is split into two states with different partial decay widths.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physics Letters B - Volume 659, Issues 1â2, 17 January 2008, Pages 94-100
Journal: Physics Letters B - Volume 659, Issues 1â2, 17 January 2008, Pages 94-100
نویسندگان
CB-ELSA and A2-TAPS Collaborations CB-ELSA and A2-TAPS Collaborations, A.V. Sarantsev, M. Fuchs, M. Kotulla, U. Thoma, J. Ahrens, J.R.M. Annand, A.V. Anisovich, G. Anton, R. Bantes, O. Bartholomy, R. Beck, Yu. Beloglazov, R. Castelijns, V. Crede,