LFV

The LFV diagram.

import matplotlib.pyplot as plt
from feynman import Diagram

fig = plt.figure(figsize=(10.,10.))
ax = fig.add_axes([0,0,1,1], frameon=False)

diagram = Diagram(ax)
in1 = diagram.vertex(xy=(.1,.5))
in2= diagram.vertex(xy=(.4,.5))
v1 = diagram.vertex(xy=(.65,.65))
v2 = diagram.vertex(xy=(.65,.35))
out1 = diagram.vertex(xy=(.9,.65),marker='')
out2 = diagram.vertex(xy=(.9,.35),marker='')

higgs = diagram.line(in1, in2, arrow=False, style='dashed')
nu1 = diagram.line(v1, in2)
nu2 = diagram.line(in2, v2)
w = diagram.line(v1, v2, style='wiggly')
lep = diagram.line(out1, v1)
tau = diagram.line(v2, out2)

nu1.text(r"$\nu_\ell$",fontsize=40)
nu2.text(r"$\nu_\tau$",fontsize=40)
lep.text(r"$\ell^+$",fontsize=40)
tau.text(r"$\tau^-$",fontsize=40)
diagram.text(0.72,0.5,"$W^\pm$",fontsize=40)
higgs.text("H",fontsize=40)

diagram.plot()
plt.show()

Total running time of the script: ( 0 minutes 0.074 seconds)