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Paper 1
Module 1 - Particles
Feynman diagrams
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Charlotte Coe
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feynman diagrams
allow us to draw
interactions
feynman diagrams
are drawn on a slant to show
time
passing
The squiggle in the middle of a
fireman
diagram shows the
exchange particles
the
gauge boson
associated with
nucleons
is the
pion
gauge
bone associated with corks is the
gluon
beta minus decay
?
Neutron
turns into a
proton
electron and
antielectron neutrino
beta minus decay
?
n ->
p
+
e-
+
ve-
in
beta minus decay
the
neutron
decay to a
proton
and a
w- boson
is emitted
The
W-
boson emitted in
beta minus decay
transfers a negative
charge
across to the other side so the charge balances.
beta plus decay
?
protein decays into a neutron ,
positron
and an
electron neutrino
beta plus decay
?
p ->
n
+
e+
+
ve
in
beta plus decay
, a
proton
decays to a
neutron
and a
w+
boson is emitted
the
w+
boson in
beta plus decay
carries the charge to the
positron
beta
minus decay
beta
plus decay
electron capture
–
weak interaction
electron
proton collision
is not an
electromagnetic
interaction
electron capture
?
p+
e-
-> n +
ve
electron-proton
collision
?
p + e- -> n +
ve
in
electron capture
,
proton
rich nuclei capture an orbital electron from inside the atom and change it into a
neutron
in
electron capture
a
proton
decays to a
neutron
and a
W plus boson
is emitted. this interacts with electron to produce the
electron neutrino
in
electron capture
the
W plus boson
arrow is towards the right because the
proton
decays into it ( coming from it )
in an
electron-proton collision
, the electron collides with the proton and the
w- boson
comes from the electron so the arrow is pointing left/down.
electron capture
electron
-
proton
collision
antiparticles
move back in
time
electromagnetic
repulsion
- the exchange particle is a
gamma photon
electromagnetic
repulsion
neutrino
interactions are not very common
neutrino
interactions
?
p +
ve-
-> n + e+ = this has a w+ boson
n + ve -> p + e- = this has a
w-
boson
p
+
ve-
->
n
+
e+
n
+
ve
->
p
+
e-
all decays involve
W plus
or
W minus
bosons
exchange particles
:
electromagnetic repulsion - gamma photon
beta minus decay - w- boson right
beta plus decay - w+ boson right
electron capture - w+ boson right
electron-photon collision - w- boson left
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