14-partices - e b 1/3 e b 5000 Bottom 2/3 e t +2/3 e t...

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4 Fundamental Forces Infinite ( 1/ r 2 ) 10 –43 Gravitational 10 –3 fm 10 –6 Weak Infinite ( 1/ r 2 ) 10 –2 Electromagnetic 1 fm 1 Strong Range Relative Strength Force 14.1
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0.8 x 10 –10 1672 Ω + Ω Omega 1.6 x 10 –10 1197 Σ + Σ 6 x 10 –20 1192 Σ 0 Σ 0 0.8 x 10 –10 1189 Σ Σ + Sigma 2.6 x 10 –10 1116 Λ 0 Λ 0 Lambda 900 939.6 n n Neutron Stable 938.3 p p Proton Heavy particles Baryons Lifetime (s) Rest energy (MeV) Antiparticle symbol Particle symbol Particle Hadrons ( Heavy particles) 14.2
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10 –13 1784 τ + τ Tau 2.2 x 10 –6 105.7 μ + μ Muon Stable 0.511 e + or β + e or β Electron Lifetime (s) Rest energy (MeV) Antiparticle symbol Particle symbol Particle Leptons (light particles) Stable 0 but not 0!! ν τ ν τ Tau neutrino Stable 0 but not 0!! ν μ ν μ Muon neutrino Stable 0 but not 0!! ν e ν e Electron neutrino Lifetime (s) Rest energy (MeV) Antiparticle symbol Particle symbol Particle Neutrinos – involved in weak nuclear force Fat electrons 14.3
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Quarks and Antiquarks +1/3
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Unformatted text preview: e b 1/3 e b 5000 Bottom 2/3 e t +2/3 e t 173,000 Top +1/3 e s 1/3 e s 540 Strange 2/3 e c +2/3 e c 1500 Charmed +1/3 e d 1/3 e d 360 Down 2/3 e u +2/3 e u 360 Up Charge Symbol Charge Symbol Rest energy (MeV) Name Antiquarks Quarks Valence quarks 14.4 u d Q=+1 , and its called a + M~140 [MeV/c 2 ] Lifetime~2.6x10-8 [s] Gluons communicate force between quarks Mesons = quark / anti-quark bound together. communicates force between p+ and n 7 7 3 3 X Li = 14.5 Quarks and leptons = most fundamental particles Up & down quarks and electrons make up ordinary matter. other quarks and leptons-produced in cosmic ray showers or high energy accelerators. (or early universe) EM force strong force weak force Lots neutrinos in Univ. 14.6 14.7...
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This note was uploaded on 04/03/2012 for the course PHY 1020 taught by Professor Kodera during the Spring '11 term at University of Florida.

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14-partices - e b 1/3 e b 5000 Bottom 2/3 e t +2/3 e t...

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