Timeline for Separation of term in Møller scattering cross section
Current License: CC BY-SA 3.0
5 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Dec 30, 2017 at 0:17 | vote | accept | user140561 | ||
| Oct 18, 2017 at 18:20 | comment | added | user140561 | @JamalS You're right. I edited the answer to be more precise. Thank you. | |
| Oct 18, 2017 at 18:20 | history | edited | user140561 | CC BY-SA 3.0 |
Included JamalS's remark.
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| Oct 18, 2017 at 18:10 | comment | added | JamalS | $u$ and $\bar u$ are spinors, so they carry $\alpha,\beta$ indices, just as when we write $\gamma^\mu$ we mean $(\gamma^\mu)_{\alpha\beta}$. Two spinors with one $\gamma^\mu$ soaks up the two spinor indices, but we still have the Lorentz index. So while you can swap them safely, strictly speaking the factor on its own is not a scalar unless you are more specific with regards to what it is a scalar with respect to. | |
| Oct 18, 2017 at 18:06 | history | answered | user140561 | CC BY-SA 3.0 |