On the definitions of the gamma*N-->N* helicity amplitudes
Journal Article
·
· Physical Review C
OSTI ID:956221
We present definitions and formulas that may be useful for a consistent computation of helicity amplitudes for the process gamma* N -> N* in theoretical approaches. Of particular importance is the correct determination of the common sign of the amplitudes and of the relative sign between the transverse (A12,A32) and longitudinal (S12) amplitudes. This clarification is necessary to clear up confusions present in theoretical works. Using the definitions presented in this paper will enable a direct comparison with amplitudes extracted from experimental data.
- Research Organization:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-060R23177
- OSTI ID:
- 956221
- Report Number(s):
- JLAB-PHY-08-892; arXiv:0810.0997; DOE/OR/23177-0497; PRVCAN; TRN: US1004947
- Journal Information:
- Physical Review C, Journal Name: Physical Review C; ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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