Standard Model

Question 1

Introduction to Standard Model

Answer 1

Matter is made of fundamental particles, smallest things in the world. How these particles interact is a theory called the ‘Standard Model’.

Question 2

Higgs Boson

Answer 2

How all fundamental matter particles aquire mass - quantam ripple in the background energy field of the universe

Question 3

Muons and Tau

Answer 3

Only seen in high energy experiments as they decay easier

Question 4

Elementary Particles

Answer 4

Fundamental particle that has no smaller known constituents

Question 5

Antiparticle

Answer 5

A particle with the same mass and opposite physical changes to a corresponding particle

Question 6

Hadrons

Answer 6

Quarks interact to form hardrons which are baryons and mesons

Question 7

Baryons

Answer 7

3 quarks

Question 8

Mesons

Answer 8

1 quark and 1 antiquark

Question 9

Leptons

Answer 9

Particles governed by weak nuclear forces and electromagnetism

Question 10

Baryon and Lepton Member

Answer 10

• conservation of energy
• conservation of momentum
• conservation of charge
• conservation of baryon number
• conservation of lepton number

Question 11

Gauge Bosons

Answer 11

Gluons, photons, Z boson, W boson

Question 12

Gluons

Answer 12

• Exhanged between quarks
• This is what binds protons and neutrons in the nucleus
• Massless boson

Question 13

Photons

Answer 13

• Exchanged between leptons
• Responsible for EM force and interact with any charged particle
• Zero rest mass, finite momentum

Question 14

Z boson

Answer 14

• Massive intermediate particle involved in weak nuclear interaction (electron/neutrino)
• Z interaction hard to observe

Question 15

W boson

Answer 15

• Massive intermediate particles involved in weak nuclear interactions
• W- involved in neutron decay to proton (beta decay)
• W+ involved in proton decay to neutron (positron decay)