Electron neutrino
interacts with an
exchange particle and
becomes an electron
A muon neutrino
interacts with an
exchange particle and
becomes a muon
A strange quark emits an
exchange particle and
A down quark emits an becomes an up quark
exchange particle to
become an up quark
Particle-antiparticle
pair creation. An
exchange particle
materializes as an
electron and an
electron antineutrino.
(One of the arrows must
point backwards towards the
vertex.)
This is a “diagonal” flavor
change where a quark
transforms into a member
of a neighboring
generation
A positron enters a
vertex, emits an
exchange particle and
emerges as an
antineutrino
Particle-antiparticle
annihilation seen as a
vertex with an
exchange particle
emerging.
Feynman diagram for
ordinary negative
muon decay
An electron neutrino
interacts with a muon
to produce and
electron and a muon
neutrino
The standard beta
decay diagram. This is
a combination of a
quark-quark vertex
and a lepton-lepton
vertex.
Positive muon decay
A postitron-muon
interaction results in
the emergence of a
muon neutrino and an
electron antineutrino
Kaon decay into a pair
of pions seen at the
quark level
A kaon decay path into
a positive muon and its
neutrino
During a proton-proton
Electron-positron
collision, a gluon is
annihilation seen as the released from a quark
emission of two
and then materializes
photons at two
into a same flavor
successive vertices
quark-antiquark pair.
This produced a pion.
During a proton-proton
collision a quark
changes flavor. A W+
boson is released an
materializes into a
quark, antiquark pair.
This produces a pion.
A. an electron and a positron
annihilating into a photon, which
then “pair produces” into
another electron and positron.
B. An electron and a positron
interacting by sending a photon
between them. This is definitely
a different process since the
electron and positron never
actually touch, unlike the first
diagram.