Hadrons

Question 1

what are hadrons

Answer 1

a particle which is made up of two or more quarks

Question 2

where are quarks never found

Answer 2

in isolation

Question 3

what is a baryon

Answer 3

a hadron which is made of three quarks

Question 4

what can antiparticles combine to form

Answer 4

antimatter

Question 5

what is a meson

Answer 5

a hadron made of a quark and anti-quark pair

Question 6

what are the two types of mesons

Answer 6

pions and kaons

Question 7

what are the 4 quark compositions of a pion

Answer 7

uu
ud
du
dd

Question 8

what are the two rules you need to remember when finding out the quark composition of a pion

Answer 8

• they contain a quark-antiquark pair
• they only contain up and down quarks

Question 9

what is the charge of ud quark

Answer 9

+1e

Question 10

what is the charge of du quark

Answer 10

-1e

Question 11

what is the charge of uu quark

Answer 11

0

Question 12

what is the charge of dd quark

Answer 12

0

Question 13

what do the pion charges show

Answer 13

the name of the pion eg +1e is the positive pion

Question 14

how many types of pion are there

Answer 14

4
positive,negative and 2 neutral

Question 15

what is the third type of meson

Answer 15

kaon

Question 16

what is special about a kaon

Answer 16

they all contain a strange quark

Question 17

what is the charge of the su kaon

Answer 17

-1e

Question 18

what is the charge of the us kaon

Answer 18

+1e

Question 19

what is the charge of the ds kaon

Answer 19

0

Question 20

what is the charge of the sd kaon

Answer 20

0

Question 21

how to find the charge of a meson

Answer 21

write its quark composition
substitute charge values
sum the values to find its total charge

Question 22

what is the symbol for the kaon

Answer 22

K

Question 23

what are the 4 types of kaon

Answer 23

negative kaon
positive kaon
neutral kaon
neutral anti-kaon

Question 24

what is the lifespan of a meson

Answer 24

tiny (fraction of a second)

Question 25

do all mesons decay

Answer 25

yes

Question 26

what are the two different conditions for baryon decay

Answer 26

inside the nucleus
outside the nucleus

Question 27

can protons and neutrons inside the nucleus decay into other particles

Answer 27

yes

Question 28

what are they called when protons and neutrons are outside the nucleus

Answer 28

free

Question 29

does a free neutron decay

Answer 29

yes into a proton

Question 30

does a free proton decay

Answer 30

no, as its the only stable baryon

Question 31

what will all baryons decay into

Answer 31

a proton

Question 32

how to identify a hadrons composition

Answer 32

• narrow down the type of hadron
• type of baryon or meson
• quark composition