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Particle physics > Leptons and Quarks > Flashcards

Leptons and Quarks Flashcards

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1
Q

what are leptons

A

fundamental particles 6 different types

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2
Q

life times of leptons

A

electron and all neutrinos have infinite lifetime muons and taus are short lived.

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3
Q

most stable lepton, and why

A

electrons because they are the lightest

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4
Q

which quark combination has infinite lifetime and why

A

proton because it is the lightest possible combination of quark.

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5
Q

what do quarks combine to make

A

hadrons

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6
Q

what force is needed to make hadrons

A

strong force

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7
Q

what is a baryon

A

3 quarks

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8
Q

what is a mesons

A

1 quark and 1 anti quark

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9
Q

baryon and mesons are ….

A

hadrons

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10
Q

what happens to the attraction between quarks as they get closer together

A

the attraction gets weaker

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11
Q

what is different in a anti quark to a quark

A

opposite, charge, strangness and baryon number

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12
Q

proton is what combination of quarks

A

uud

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13
Q

neutron is what combination of quarks

A

udd

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14
Q

why do quarks not exsits alone

A

the energy needed to seperate them from a triplet is too large

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15
Q

what are the lightest baryons

A

protons and neutrons, an anti proton is not a anti baryon

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16
Q

hadron

A

combination of quarks (baryon and measons)

17
Q

stability of baryons

A

a free proton is stable however a free neutron (outside the nucleus) will decay in less than 15 mins. All other baryons are unstable and decay

18
Q

baryon numbers

A

barons have a baryon number of +1, measons have a baryon number of 0 , anti baryon have a baryon number of -1

19
Q

anti mesons

A

each meson has a anti meson

20
Q

life time of mesons

A

tend to annihilate and have very short life times

21
Q

stability of mesons

A

no stable mesons: all decay to less positive particles whilst obeying all the relevant conservation laws

Particle physics (7 decks)

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