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Qmechanic ♦
Qmechanic ♦
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How to tell whether a Feynman diagram is t$t$-channel or s$s$-channel by looking?

By looking at a diagram, how does one tell whether it represents a $s$-channel process or a $t$-channel process i.e., without finding the amplitude? I'm familiar with Mandelstam variablesMandelstam variables but I've trouble understanding what a s$s$-channel or t$t$-channel process would mean and how to tell the difference.

How to tell whether a Feynman diagram is t-channel or s-channel by looking?

By looking at a diagram, how does one tell whether it represents a $s$-channel process or a $t$-channel process i.e., without finding the amplitude? I'm familiar with Mandelstam variables but I've trouble understanding what a s-channel or t-channel process would mean and how to tell the difference.

How to tell whether a Feynman diagram is $t$-channel or $s$-channel by looking?

By looking at a diagram, how does one tell whether it represents a $s$-channel process or a $t$-channel process i.e., without finding the amplitude? I'm familiar with Mandelstam variables but I've trouble understanding what a $s$-channel or $t$-channel process would mean and how to tell the difference.

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edit approved May 3, 2017 at 17:42
dukwon
edit approved May 3, 2017 at 17:42
dukwon
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How to tell whether a Feynman diagram is t-channel or s-channel by looking?

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SRS
SRS
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How to whether a Feynman diagram is t-channel or s-channel by looking?

By looking at a diagram, how does one tell whether it represents a $s$-channel process or a $t$-channel process i.e., without finding the amplitude? I'm familiar with Mandelstam variables but I've trouble understanding what a s-channel or t-channel process would mean and how to tell the difference.