2.4 - Quarks And Anti-Quarks Flashcards
why are kaons considered strange
they are created by strong interaction but decay by weak interaction
what do kaons decay into
pions
what were considered the kaons
only those that decay into pions
what were other particles such as sigma particle found to have
different rest masses which were greater than the protons rest mass
decays either in sequence or directly into pions and protons
what are strange particles created in
in twos
what quarks are types of quarks and antiquarks are needed to make hadrons
Up down and strange
mesons are hadrons consisting of
2 quarks - a quark and an antiquark
pi 0 meson quark combination
up and anti up
down and anti down
why is strange anti strange not considered a pi0 meson
decays much faster than pions
what are the 2 uncharged kaons
k 0 meson or anti k 0 meson
what’s the antiparticle of any meson
is a quark antiquark pair
Baryons and anti baryons are hadrons that consist of
3 quarks for a baryon or 3 antiquarks for an anti baryon
the sigma particle is what
a baryon containing a strange quark
what happens to the quarks in b- decay
a neutron changes into a proton
therefore a down quark has changed into an up quark
what happens to the quarks in b+ decay
a proton changes into a neutron
therefore an up quark changes into a down quark
k+ combo
U-S
k- combo
s-U
k 0 combo
d-s
pi 0 combo
u-u. d-d
pi + combo
U -d
pi- combo
d-u
proton
uud
antiproton
-u -u -d
neutron
ddu
antineutron
-d-d-u
charge for up quark
+2/3
charge for anti up
-2/3
charge for down and strange
-1/3
charge for anti down and anti strange
+1/3
baryon number for there quarks
+1/3
strange numbers
+1 for kaons
0 for nonkaons
must be conserved
what dud observations that strangeness is not conserved when strange particles decay lead to
the idea that strangeness isnt conserved in weak interactions
