2.4 - Quarks And Anti-Quarks Flashcards

You may prefer our related Brainscape-certified flashcards:
1
Q

why are kaons considered strange

A

they are created by strong interaction but decay by weak interaction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

what do kaons decay into

A

pions

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

what were considered the kaons

A

only those that decay into pions

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

what were other particles such as sigma particle found to have

A

different rest masses which were greater than the protons rest mass

decays either in sequence or directly into pions and protons

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

what are strange particles created in

A

in twos

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

what quarks are types of quarks and antiquarks are needed to make hadrons

A

Up down and strange

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

mesons are hadrons consisting of

A

2 quarks - a quark and an antiquark

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

pi 0 meson quark combination

A

up and anti up
down and anti down

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

why is strange anti strange not considered a pi0 meson

A

decays much faster than pions

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

what are the 2 uncharged kaons

A

k 0 meson or anti k 0 meson

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

what’s the antiparticle of any meson

A

is a quark antiquark pair

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Baryons and anti baryons are hadrons that consist of

A

3 quarks for a baryon or 3 antiquarks for an anti baryon

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

the sigma particle is what

A

a baryon containing a strange quark

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

what happens to the quarks in b- decay

A

a neutron changes into a proton
therefore a down quark has changed into an up quark

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

what happens to the quarks in b+ decay

A

a proton changes into a neutron
therefore an up quark changes into a down quark

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

k+ combo

A

U-S

17
Q

k- combo

A

s-U

18
Q

k 0 combo

A

d-s

19
Q

pi 0 combo

A

u-u. d-d

20
Q

pi + combo

A

U -d

21
Q

pi- combo

A

d-u

22
Q

proton

A

uud

23
Q

antiproton

A

-u -u -d

24
Q

neutron

A

ddu

25
Q

antineutron

A

-d-d-u

26
Q

charge for up quark

A

+2/3

27
Q

charge for anti up

A

-2/3

28
Q

charge for down and strange

A

-1/3

29
Q

charge for anti down and anti strange

A

+1/3

30
Q

baryon number for there quarks

A

+1/3

31
Q

strange numbers

A

+1 for kaons
0 for nonkaons
must be conserved

32
Q

what dud observations that strangeness is not conserved when strange particles decay lead to

A

the idea that strangeness isnt conserved in weak interactions