124 lines
2.2 KiB
Plaintext
124 lines
2.2 KiB
Plaintext
{
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"cells": [
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{
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"cell_type": "code",
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"execution_count": 20,
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"metadata": {},
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"outputs": [],
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"source": [
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"using Combinatorics"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 41,
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"metadata": {},
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"outputs": [
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{
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"data": {
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"text/plain": [
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"num_diagrams (generic function with 3 methods)"
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]
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},
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"metadata": {},
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"output_type": "display_data"
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}
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],
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"source": [
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"function num_diagrams(m::Int, e::Int, u::Int = 0, t::Int = 0)\n",
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" n = e + u + t\n",
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" return Int(factorial(3n-3) / factorial(2n-1)) * binomial(m+3n-3, 3n-3) * factorial(m) * factorial(e) * factorial(u) * factorial(t)\n",
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"end"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 42,
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"metadata": {},
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"outputs": [
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{
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"data": {
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"text/plain": [
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"8"
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]
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},
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"metadata": {},
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"output_type": "display_data"
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}
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],
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"source": [
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"# Trident:\n",
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"num_diagrams(1, 2)"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 43,
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"metadata": {},
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"outputs": [
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{
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"data": {
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"text/plain": [
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"7-element Vector{Int64}:\n",
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" 2\n",
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" 6\n",
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" 24\n",
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" 120\n",
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" 720\n",
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" 5040\n",
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" 40320"
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]
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},
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"metadata": {},
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"output_type": "display_data"
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}
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],
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"source": [
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"# n-Photon Compton:\n",
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"[num_diagrams(n, 1) for n in 2:8]"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 62,
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"metadata": {},
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"outputs": [
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{
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"data": {
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"text/plain": [
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"6-element Vector{Int64}:\n",
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" 2\n",
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" 36\n",
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" 1728\n",
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" 158400\n",
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" 23587200\n",
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" 5181926400"
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]
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},
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"metadata": {},
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"output_type": "display_data"
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}
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],
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"source": [
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"# fermion scattering\n",
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"[num_diagrams(0, n) for n in 2:7]"
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]
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}
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],
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"metadata": {
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"kernelspec": {
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"display_name": "Julia 1.9.4",
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"language": "julia",
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"name": "julia-1.9"
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},
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"language_info": {
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"file_extension": ".jl",
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"mimetype": "application/julia",
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"name": "julia",
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"version": "1.9.4"
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}
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},
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"nbformat": 4,
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"nbformat_minor": 2
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}
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