A Feynman diagram for bound particle output

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The discussion centers on the formation of Feynman diagrams from differential equations in particle interactions, specifically when incoming particles are unbound and outgoing particles are bound, such as in the case of hydrogen atoms. The original poster expresses difficulty finding relevant literature on this topic and requests bibliographic references for graduate-level papers. There is skepticism about the poster's familiarity with Feynman diagrams, prompting questions about any calculations they may have performed. The conversation highlights a gap in available resources for this specific area of particle physics. Overall, the need for more comprehensive literature on the topic is emphasized.
JonAce73
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Feynman diagram for bound particle output
I am interested on how Feynman diagram is formed from a differential equation model of particle interaction wherein the incoming particles are not bound (e.g., separated neutron, proton and electron) and one or more of the outgoing particles are bound (e.g., hydrogen atom). However, I had never found any literature that deal with my topic of interest. I would highly appreciate if anyone can provide me with a bibliography of a paper on this topic.
 
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A-level means "graduate level". Are you sure that's what you want? From the question, I think it's not likely you have done any calculations with Feynman diagrams. Have you? If so, which ones?
 

Thread 'Angular Momentum Vector and Its Magnitude'

For the quantum state ##|l,m\rangle= |2,0\rangle## the z-component of angular momentum is zero and ##|L^2|=6 \hbar^2##. According to uncertainty it is impossible to determine the values of ##L_x, L_y, L_z## simultaneously. However, we know that ##L_x## and ## L_y##, like ##L_z##, get the values ##(-2,-1,0,1,2) \hbar##. In other words, for the state ##|2,0\rangle## we have ##\vec{L}=(L_x, L_y,0)## with ##L_x## and ## L_y## one of the values ##(-2,-1,0,1,2) \hbar##. But none of these...
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