All Questions
4
questions
1
vote
0
answers
51
views
What are extrinsic and intrinsic flavour production?
In terms of Feynman diagrams, what are extrinsic and intrinsic flavour production?
See for example this paper this paper (p.2).
- 1,187
1
vote
1
answer
286
views
$u$-channel in $gg \rightarrow u\bar{u}$
I've seen that for the QCD process $gg \rightarrow u\bar{u}$, where $g$ is a gluon and $u, \bar{u}$ are the up quark and the corresponding antiquark, there is $s$, $t$ and $u$ channels.
I perfectly ...
- 1,597
8
votes
1
answer
301
views
"Unaccounted for" vertices in certain Feynman diagrams?
I'm looking to understand where certain "unexplained" vertices in some Feynman diagrams come from, in a physical sense. For example, in the top figure (Aaij et al. 2015), in diagram (b), there is an "...
- 83
2
votes
1
answer
692
views
Gluon to quark scattering
I am trying to calculate the $g g\to q \bar q$ amplitude but am finding it intractably complex. I have determined that there are only two independent polarizations that contribute non-zero ...
- 1,083