P470
Lecture 3 (January 29, 2014)
Introduction and Overview
We now consider the quarks. Unlike the leptons, the quarks have never been
observed experimentally as free particles. There is much indirect evidence,
including spectroscopy of hadrons as well as
Physics 470 Homework 4
Due February 26, 2014
Problem 1 (25 points)
Problem 4.9 of Thomson
Problem 2 (25 points)
Problem 4.12 of Thomson
Problem 3 (25 points)
Problem 4.13 of Thomson
Problem 4 (25 points)
Problem 4.14 of Thomson
1
Physics 470 Homework 6
Due Wednesday, March 12, 2014
Problem 1 (20 points)
problem 5.2 of Thomson
Problem 2 (30 points)
problem 5.1 of Thomson
Problem 3 (25 points)
problem 5.3 of Thomson
Problem 4 (25 points)
problem 6.3 of Thomson
Physics 470 Homework 8
Due April 9, 2014
Problem 1 (20 points)
Problem 6.6 of Thomson
Problem 2 (40 points)
Problem 6.10 of Thomson
Problem 3 (20 points)
Problem 7.4 of Thomson
Problem 4 (20 points)
Problem 7.8 of Thomson
Physics 470 Homework 11
Due May 9, 2014
Problem 1 (25 points)
Problem 10.3 of Thomson
Problem 2 (25 points)
Problem 10.4 of Thomson
Problem 3 (25 points)
Problem 10.5 of Thomson
There are many possible Feynman diagrams at the lowest-order involving quarks
Physics 470 Homework 5
Due Wednesday, March 5, 2014
Problem 1 (25 points)
The definition of 5 is 5 = i 0 1 2 3 . The operators
PR 21 (1 + 5 ),
PL 12 (1 5 )
are the right-hand and left-hand projection operators. Show that they have the appropriate properti
Physics 470 Homework 7
Due April 2, 2014
Problem 1 (25 points)
In terms of a four-component spinor , the right- and left-handed states are defined as
R = 21 (1 + 5 ),
L = 12 (1 5 ).
Show that
= L L + R R ,
5 = L 5 L + R 5 R ,
m
= L mR + R mL .
This exer
Physics 470 Homework 9
Due April 16, 2014
Problem 1 (20 points)
Problem 8.2 of Thomson
Problem 2 (40 points)
Problem 8.3 of Thomson
Problem 3 (20 points)
Problem 8.7 of Thomson
Problem 4 (20 points)
Assume that the momentum distribution of up valence quar
Physics 470 Homework 10
Due April 30, 2014
Problem 1 (20 points)
Problem 9.3 of Thomson
You might find the following list of some Clebsch-Gordon coefficients useful:
List of some Clebsch-Gordon coefficients < JM|J1 , m1 , J2 , m2 >
< 3/2, 3/2|1/2, 1/2, 1,
Physics 470 Homework 1
Due February 5, 2014
Problem 1 (20 points)
As we discussed in class, mesons are made of quark-antiquark pairs and
baryons are made of three quarks.
a) How many different combinations of mesons can one make with 1, 2, 3, 4,
or 5 quar
Physics 470 Homework 3
Due February 19, 2014
Problem 1 (20 points)
Particle A (energy E) hits particle B (at rest), producing particles C1 , C2 , ., Cn : A+B
C1 , +C2 + . + Cn .
a) Show that the threshold (i.e. minimum E) for this reaction, in terms of t
Physics 470 Homework 2
Due Wednesday, February 12, 2014
Problem 1 (20 points)
Based on the quark model for baryons and mesons, can the following particle exist?
Explain why.
a) A meson with isospin 3/2
b) A baryon with charge +2
c) An anti-baryon with cha
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