Evidence for the Strong Interaction

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1 Evidence for the Strong Interaction Scott Wilbur Scott Wilbur Evidence for the Strong Interaction 1

2 Overview Continuing search inside fundamental particles Scott Wilbur Evidence for the Strong Interaction 2

3 Discovery of Nucleus Plum pudding model (Thompson) 1911: Rutherford observes hard scattering of α particles off of gold atoms Atoms must have a small, dense nucleus Scott Wilbur Evidence for the Strong Interaction 3

4 Discovery of Protons 1918: Rutherford shoots α particles into nitrogen, sees hydrogen nuclei produced Nitrogen must contain hydrogen nuclei Since hydrogen has atomic number 1, assume it is an elementary particle Scott Wilbur Evidence for the Strong Interaction 4

5 Discovery of Neutrons 1930: Walther Bothe and H. Becker notice that α particles hitting light elements produces a new, penetrating radiation 1932: Irène Joliot-Curie and Frédéric Joliot notice that if this radiation hits a compound containing hydrogen, it ejects high-energy protons 1932: James Chadwick rejects γ ray hypothesis, proposes that new radiation is an uncharged particle with same mass as proton Scott Wilbur Evidence for the Strong Interaction 5

6 Strong Nuclear Force All nucleons are either positive or neutral: need another force to hold them together 1935: Hideki Yukawa proposes a mechanism: nucleons exchange massive bosons (mesons) Mesons must have mass 100 MeV p p π 0 n n Scott Wilbur Evidence for the Strong Interaction 6

7 Discovery of Pions 1947: Cecil Powell, Cèsar Lattes and Giuseppe Occhialini at the University of Bristol observe cosmic rays using photographic emulsions Charged particles leave tracks Pions identified by double meson tracks (π ± µ ± ν µ ) Scott Wilbur Evidence for the Strong Interaction 7

8 The Eightfold Way 1961: Murray Gell-Mann develops classification scheme for hadrons SU(3) flavor symmetry (quantum numbers: isospin, hypercharge) Spin-0 mesons, spin-1 mesons, and spin- 1 2 baryons in 8, spin-3 2 baryons in 10 Leads to discovery of new baryon: Ω Proposes quarks (up, down, strange) as underlying triplet Scott Wilbur Evidence for the Strong Interaction 8

9 Electron Proton Scattering The MIT-SLAC Collaboration performed e +p scattering experiments at 20 GeV in 1966 Analysis of elastic scattering showed no evidence for structure Scott Wilbur Evidence for the Strong Interaction 9

10 Deep Inelastic Scattering Inelastic scattering analyzed in 1967 Much larger cross sections than expected Electrons were exciting the protons (or breaking them up) First actual evidence that protons were composite Scott Wilbur Evidence for the Strong Interaction 10

11 Deep Inelastic Scattering Cross section for scattering is σ(e, E, θ) = 4e4 E 2 [ W q 4 2 (v, q 2 ) cos 2 θ 2 + 2W 1(v, q 2 ) sin 2 θ ] 2 Bjorken predicts (and finds) scaling: vw 2 = F 2 (v/q 2 ), implying pointlike constituents Scott Wilbur Evidence for the Strong Interaction 11

12 The Parton Model Feynman visited SLAC in 1968, sees inelastic scattering data and fits to Bjorken scaling Identifies x = q2 2mv parton with the fraction of momentum carried by According to Friedman: Feynman came up with a simple dynamical model which experimenters could really understand. It was another way of saying what Bjorken was saying except it gave it a sort of physical structure. Scott Wilbur Evidence for the Strong Interaction 12

13 Asymptotic Freedom Seems that Gell-Mann s quarks are the partons, and are loosely bound inside proton If quarks actually exist inside proton, why has no one seen one come out? David Gross, David Politzer, and Frank Wilczek formulate QCD Asymptotic freedom Quarks are loosely bound, but trapped inside hadrons Scott Wilbur Evidence for the Strong Interaction 13

14 Quark Theory Accepted Logarithmic scaling violations observed (as predicted) at Fermilab and CERN Nobel Prizes for all involved Yukawa Explaining strong force by meson exchange Powell Discovering pions Gell-Mann Proposing The Eightfold Way Friedman, Kendall, Taylor Discovering quarks Gross, Politzer, Wilczek Discovering QCD Scott Wilbur Evidence for the Strong Interaction 14

15 Summary The strong interaction was discovered by continually looking for constituents of fundamental particles Currently, it looks like quarks and gluons are the fundamental particles Could there be something else? Scott Wilbur Evidence for the Strong Interaction 15

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