8.276 Nuclear and Particle Physics
Problem Set 6
Professor Mike Williams
TA Colton OConnor
Friday, March 22, 2013
1
Griffiths 9.1
When looking at a massive spin-1 particle, we are free to choose a gauge where the Lorentz condition
holds: A = 0. This immed

8.276 Nuclear and Particle Physics
Problem Set 1
Professor Mike Williams
TA Colton OConnor
Friday, February 15, 2013
1
Griffiths 1.2
m=
h
hc
200 MeV fm
=
= 100 MeV/c2
2r0 c
2r0 c2
2 1 fm c2
The PDG lists the mass of the pion at 140 MeV/c2 .
2
Griffiths 1.

8.276 Nuclear and Particle Physics
Problem Set 7
Professor Mike Williams
TA Colton OConnor
Friday, April 5, 2013
1
Lifetime of the Charm Quark
(a)
As a single fundamental particle, a free charm quark would only be allowed to decay via a weak
process. It c

8.276 Nuclear and Particle Physics
Problem Set 3
Professor Mike Williams
TA Colton OConnor
Friday, March 1, 2013
1
Griffiths 7.8
(a)
We begin with the Dirac equation and solve for an expression for the energy of the system:
p m = 0
0 E ~ p~ m = 0
0 ( 0

8.276: Pset 4
Reading: Griffiths the rest of chapter 7.
Problems
1. Show that the mean value of t from the distribution et is = 1/ (Hint: you should find integration by
parts helpful). [5 pts]
2. Compute the Fourier transform of the static (with the time-

8.276: Pset 8
Guest Lecture
Attendance of Dr. Neils guest lecture on jet physics (April 8). [50 pts]
Problems
1. Griffiths 11.2 [10 pts]
2. Griffiths 11.3 [10 pts]
3. Draw the lowest-order Feynman diagrams for all 2 2 reactions involving a or and nucleon