These are the most frequently used words in this book.
action
amplitude
case
charge
complex
compute
consider
constant
contribution
corrections
corresponding
coupling
define
derivatives
diagrams
dimensions
dirac
does
energy
eq
equation
external
factor
fermion
feynman
field
fig
find
first
form
function
gauge
get
given
group
however
index
indices
integral
invariant
k2
lagrangian
let
line
loop
lorentz
m2
mass
matrices
matrix
momentum
must
need
next
note
now
number
operator
order
p2
part
particles
photon
problem
propagator
quantum
quark
real
representation
result
scalar
scattering
second
section
see
set
should
show
side
since
spinor
state
symmetry
take
term
theory
therefore
three
thus
time
transformation
two
use
value
vanishes
vector
vertex
write
yields
zero