Week 11 Notes
This is non-linear
Qualitatively Fields have charges and produce more fields
This will lead to additional Feynman rules, involving self-couplings
The fields that result are called gluon fields
The true strong force is this force
The strong f
Week 8 Notes
For any process where two particles of momenta p1 and p2 collide to make two
final particles with momenta p3 and p4, define the Mandelstam variables as
below.Show that s + t +u is a constant, and determine it in terms of the masses mi2
= pi2.
Midterm Exam
Particle Physics, Fall 2012
Name: _
October 16, 2012
Part I: Short Answer [50 points]
For each of the following, give a short answer (2-3 sentences, or a formula). [5 points each]
1. Explain qualitatively (a) how we accelerate particles to hi
Midterm Information
Equations you should memorize:
X L X ,
(1.7)
N X X Ldt ,
(1.9)
N X t N X 0 exp tot t .
BR X Y
c 0
1
1 v2
u v g u v
(1.12)
X Y
.
tot X
(1.15)
0 1.
L0 t E
,
Lm
(1.18)
u 0v0 u v .
(2.11)
(2.8)
m p p E p .
p
v .
E
2
2
2
s p1 p2 E1
Solutions to Midterm Exam
Particle Physics, Fall 2012
Name: _
October 16, 2012
Part I: Short Answer [50 points]
For each of the following, give a short answer (2-3 sentences, or a formula). [5 points each]
1. Explain qualitatively (a) how we accelerate pa
Lecture 5
Can you explain how to obtain and the meaning of the Feynman invariant amplitude?
How to obtain it depends on the theory
For * theory read chapter 5
What it means
I dont know
Its an amplitude the amplitude that you go into a particular state
But
Particle Physics, Fall 2012
Final Exam
December 11, 2012
Part I: Short Answer [100 points]
For each of the following, give a short answer (2-3 sentences, or a formula). [5 points each]
1. [This one might be hard for Sam]: What is your name? _
2. The cross
Final Information
Equations you should memorize:
c 0
1
1 v2
u v g u v
0 1.
L0 t E
,
Lm
(1.18)
u 0v0 u v .
(2.11)
(2.8)
m2 p p E 2 p2 .
p
v .
E
2
2
2
s p1 p2 E1 E2 p1 p 2 .
(2.33)
(2.34)
(2.35)
p E , p E , p sin cos , p sin sin , p cos .
1 2 n B B n 2 1
Particle Physics, Fall 2012
Solutions to Final Exam
December 11, 2012
Part I: Short Answer [100 points]
For each of the following, give a short answer (2-3 sentences, or a formula). [5 points each]
1. [This one might be hard for Sam]: What is your name? _
Feynman Diagram (Problem Solving) Notes
Feynman Diagrams
1. Find the Feynman invariant amplitude
2. Multiply it by its complex conjugate
Later, this will be harder than it looks now
3. Rewrite this quantity in terms of the given or final energies or angle