.. _sphx_glr_auto_examples_Particle_Physics_plot_LFV.py:


LFV
===

The LFV diagram.




.. image:: /auto_examples/Particle_Physics/images/sphx_glr_plot_LFV_001.png
    :align: center





.. code-block:: python

    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)



.. only :: html

 .. container:: sphx-glr-footer


  .. container:: sphx-glr-download

     :download:`Download Python source code: plot_LFV.py <plot_LFV.py>`



  .. container:: sphx-glr-download

     :download:`Download Jupyter notebook: plot_LFV.ipynb <plot_LFV.ipynb>`


.. only:: html

 .. rst-class:: sphx-glr-signature

    `Gallery generated by Sphinx-Gallery <https://sphinx-gallery.readthedocs.io>`_