- #1
zhangyang
- 58
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When CLAS of Jlab describe the result of the process ep→epπ,the use the terminal "transverse amplitude" Ml±(W,Q2), El±(W,Q2),and "scalar(longitudinal) amplitudes"Sl±(W,Q2),they correspond to photons of the magnetic, electric, and Coulombic type.Are they observables?
The index of polarization vector of photon is :0,1,2,3.0 is scalar photon ;1 and 2 are transvers one;3 is longitudinal.But in experiment ,could observables be divided into scalar, transvers and longitudinal?
Thanks.
The index of polarization vector of photon is :0,1,2,3.0 is scalar photon ;1 and 2 are transvers one;3 is longitudinal.But in experiment ,could observables be divided into scalar, transvers and longitudinal?
Thanks.