martinfoell / colorflow-to-feynman

A C++ program for converting color flows to Feynman diagrams

colorflow-to-feyman: Convert from color flows to Feynman diagram in QCD

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Description

In Quantum Chromo Dynamics (QCD) in particle physics the color charges for the quark/anti-quarks and gluons can be put together in what is called color flows as shown to the left in the picture above. The purpose of this program is to convert these color flows to a Feynman diagram as shown to to right in the picture above. The details of the method used to convert between the color flows and the Feynman diagram can be found in chapter 6 here.

Setup

Here is a short guide for how to set up the program and run it with the color flows in the example in example.txt.

install

https://github.com/martinfoell/colorflow-to-feynman.git

build (in the same folder as Makefile)

make

run

cd bin
./main

Example

The input format for the color flows to the program are stored in a .txt file. The input example.txt is given below and corresponds to the example in the picture above.

in = q1, Q2
inter = g
out = q3, Q4
cf1 = q1, g, Q2
cf2 = Q4, g, q3

Input variable	Description	Value	Figure 1
in	incomming particles	q1, Q2	$q_1$, $\overline{q}_2$
inter	intermediate particles	g	$g$
out	outgiong particles	q3, Q4	$q_3$, $\overline{q}_4$
cf1	color flow 1	q1, g, Q2	$q_1 \rightarrow g \rightarrow \overline{q}_2$
cf2	color flow 2	Q4, g, q3	$\overline{q}_4 \rightarrow g \rightarrow q_3$

Input particle	Description
q	quark
Q	anti-quark
g	gluon