NPP2

Question 1

fourier transform is constant at ___ energy no matter the shape of the distribution

Answer 1

low

Question 2

4 momentum squared is ___

Answer 2

invariant

Question 3

projection of spin onto direction of motion

Answer 3

helicity

Question 4

we can conserve helicity and components of momentum by flipping ___

Answer 4

spin

Question 5

passing a sequence (___) of particles between 1 and 2, exchange causes a force (exchange of ___) between 1 and 2

Answer 5

field/momentum

Question 6

for a short amount of time we can ___ from nature and create a particle

Answer 6

borrow energy

Question 7

each ___ contributes to the probability of scattering via its ___

Answer 7

vertex/charge

Question 8

a ___ contributes to the probability of scattering via exchange of ___

Answer 8

propagator/momentum

Question 9

particles containing 3 quarks

Answer 9

baryons

Question 10

particles containing 2 quarks

Answer 10

mesons

Question 11

strong interaction is independent of ___

Answer 11

quark flavour

Question 12

pulling quarks apart is equivalent to

Answer 12

adding energy to the system (can create more gluons)

Question 13

valence quarks determine

Answer 13

quantum number of nucleons

Question 14

sea quarks are ___. Effective quantum numbers average out to ___

Answer 14

virtual quark-antiquark pairs/zero

Question 15

c,b,t are ___ so they play a minor role

Answer 15

very heavy

Question 16

charge q is proportional to

Answer 16

fine structure constant alpha (coupling constant)

Question 17

total probability of scattering is proportional to

Answer 17

vertices x propagators

Question 18

strength of gluon/quark interactions is proportional to

Answer 18

strong force constant

Question 19

gluons carry together

Answer 19

one colour and one anti-colour

Question 20

photons interact only with

Answer 20

charge

Question 21

gluons interact only with

Answer 21

colour (quarks and gluons)

Question 22

weak interacts with almost

Answer 22

almost everything

Question 23

higgs interacts with

Answer 23

mass

Question 24

lepton number for each family is ___ conserved

Answer 24

individually

Question 25

baryon number is

Answer 25

conserved

Question 26

Z0 interaction is ___ likely

Answer 26

least

Question 27

charge is always conserved at

Answer 27

vertices

Question 28

there is only one bound state (___) that is stable with strong force -proton

Answer 28

free (isolated)

Question 29

strong force colour ___ means we actually only have limited combinations

Answer 29

conservation

Question 30

one single ___/___ is not allowed

Answer 30

quark/gluon

Question 31

parity is a property of the ___

Answer 31

system

Question 32

we can make more ___ particles by exciting them

Answer 32

massive

Question 33

possible decays

Answer 33

electromagnetic decay
particle-antiparticle annihilation
create more lower energy particles
weak decays

Question 34

strangeness is ___ the number of strange quarks

Answer 34

negative

Question 35

Z0 will not change ___

Answer 35

family

Question 36

white combinations of colour for ___ particles

Answer 36

bound

Question 37

angular momentum and parity are not necessarily conserved for ___ interactions

Answer 37

weak

Question 38

cross section is proportional to

Answer 38

charge of particle

Question 39

most stay in their own family with ___ probability to jump to next family and ___ probability to jump two families

Answer 39

small/tiny