The definition of transverse amplitude in the process: ep→epπ

In summary, the conversation discusses the use of transverse and scalar (longitudinal) amplitudes in describing the process of ep→epπ. These correspond to different types of photons and are not directly observable, but can be inferred through a fit to data. A reference provided suggests that these amplitudes can be expanded over multipole amplitudes.
  • #1
zhangyang
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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.
 
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  • #2
What is observed is related to the squared amplitude, integrated over the phase space. So not directly no, but these squared amplitudes will result in different kinematics of the final state, and can generally be inferred with a fit to data. If you provide a reference, I can check explicitly.
 
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  • #3
RGevo said:
What is observed is related to the squared amplitude, integrated over the phase space. So not directly no, but these squared amplitudes will result in different kinematics of the final state, and can generally be inferred with a fit to data. If you provide a reference, I can check explicitly.

http://www.sciencedirect.com/science/article/pii/S0146641011001086
3.2. Expansion over multipole amplitudes

Thank you!
 

1. What is the definition of transverse amplitude in the process ep→epπ?

In the process ep→epπ, the transverse amplitude is a measure of the strength of the interaction between the initial electron (e) and proton (p) and the final electron (e) and pion (π) in the transverse direction, perpendicular to the direction of the initial and final particles.

2. How is the transverse amplitude measured in this process?

The transverse amplitude in the process ep→epπ is typically measured through the analysis of data from high-energy scattering experiments, where the initial and final particles are accelerated and collided in a controlled environment. The resulting data can be used to calculate the transverse amplitude using mathematical models and techniques.

3. What is the significance of the transverse amplitude in this process?

The transverse amplitude in the process ep→epπ is an important quantity in understanding the underlying interactions between subatomic particles. It provides valuable information about the structure and properties of these particles and can help us better understand the fundamental forces of nature.

4. Are there any factors that can affect the transverse amplitude in this process?

Yes, there are several factors that can affect the transverse amplitude in the process ep→epπ, including the energy and momentum of the initial and final particles, the angle at which they are scattered, and the properties of the particles themselves (such as spin and charge).

5. How does the transverse amplitude relate to other amplitudes in this process?

The transverse amplitude is just one component of the overall amplitude for the process ep→epπ. It is related to other amplitudes, such as the longitudinal and interference amplitudes, which together make up the full amplitude for this process. Each of these amplitudes provide unique information about the interaction between the particles and are all necessary for a complete understanding of the process.

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