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Particle: Lecture 2
Content from the second lecture of a 3rd year particle course
Type-ins are quite strict!
Last updated: April 21, 2019
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April 19, 2019
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What is the relationship for the probability of a process to occur with its constant at the vertex in question?
The probability is proportional to the constant squared
Give an example for a plane wave of a fermion (in terms of q, r and h bar)
What does q represent in the above equation?
The momentum transferred to the fermion
In layman's terms describe what a Born-approximation shows
How much of the particle’s wave function overlaps with the potential
What is needed to calculate the interaction probability?
How do we obtain the potential?
What is the mass of a photon?
What is g in a calculation for the potential of a weak interaction?
Generic coupling constant
Finish Noether's first theorem: Every differentiable ________ of the ______ __ _ ________ ______ has a corresponding ____________ ___.
symmetry, action of a physical system and conservation law
Define the spin of a particle
A particle’s angular momentum in its own rest frame.
What are the smallest and largest values of total angular momentum (in terms of L and S)?
|L-S| and L+S
Express J^2 in terms of J and h bar
Express J_z in terms of M and h bar
True or false: Fermions and antifermions have opposite intrinsic parities?
Express C-parities in terms of L and S for a fermion-antifermion pair
Express P-parities in terms of L and intrinsic P-parities
Finish the sentence: CP violation causes a ______-__________ _________.
matter, antimatter and asymmetry
List all internal quantum numbers
Charge, Baryon number and Lepton number
True or false: All these internal quantum numbers are always conserved?
Define the baryon number in terms of number of quarks and antiquarks, defined as q and p respectively
1/3 * (q-p)
True or false: The lepton number for leptons and antileptons is the same?
What is the magnitude of a boson's spin (generally) ?
What is the magnitude of a lepton's spin (generally)?
True or false: Bosons have even wave functions and leptons have odd wave functions?
If we are in a frame S we are travelling in the x-direction at relativistic speeds what is our distance travelled in the S' frame? Give your answer in terms of a generic x, gamma, v and t
What is the time in this S' frame? Give your answer in terms of a generic x, gamma, v, c and t
Give the definition of the invariant mass
Finish this sentence: The ____ __ the ________ particle is equal to the _________ ____ of the decay products.
mass of, decaying and invariant mass
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