Decay, Collisions and Particles Flashcards
1
Q
Fermi’s Golden Rule
A
P(i->f) α Amplitude(FD) x Phase Space (Left over energy for Kinetic Energy)
2
Q
Decay Equation
A
- N(t) = N(0) · e^(−tΓ)
- N = Number of particles
- t = time
- Γ = decay rate
3
Q
Average lifetime of particle equation
A
- Γ = 1/τ
- Γ = decay rate
- τ = average life time of particle
4
Q
Branching Ratio
A
- BR = Γ / ΣΓ
- Higher the BR, the more important the force is in the decay
5
Q
Fastest to Slowest decays for each Force
A
Strong, EM, Weak
6
Q
Mandelstam-s definition
A
Energy Available for particle creation in final state
7
Q
Mandelstam-s Equation - COM
A
s = (E1 +E2)^2
8
Q
Mandelstam-s - FT
A
s = (2E1m2c^2)^1/2
9
Q
Beta Decay
A
- Neutron -> Proton + Electron + Anti Electron neutron
- Half the heatoutput of the Earth
10
Q
Cosmic Rays
A
- High Energy Particles
- Eg protons
- Source: Astrophysical objects (Pulsars)
11
Q
Solar Particles
A
- Solar Wind
- Solar Neutrinos
12
Q
Solar Particles - Solar Wind
A
- Plasma of charged particles emitted from solar corona
- Earth’s Magnetic field deflects Solar Wind
13
Q
Solar Particles - Solar neutrinos
A
Neutrinos generated by the fusion process inside the sun
14
Q
Virtual Particles
A
Particles that do not follow standard energy-momentum relationship to satisfy kinematic constraints
15
Q
Mandelstam-s equation
A
s = (E1 + E2)^2 - ((p1 +p2)^2)c^2
