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Counting Quarks

Counting Quarks. University of Southampton. Our goal is to learn about the particles of nature using real data from accelerators We will not explore the theory too much just what you see…

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Counting Quarks

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  1. Counting Quarks University of Southampton

  2. Our goal is to learn about the particles of nature using real data from accelerators We will not explore the theory too much just what you see… Nuclear matter (“hadrons”) is made of quarks – we are going to experimentally determine how many quarks there are…

  3. How to vote using your zapper you can change your vote (until polling closes) by pressing another button this flashes green when you vote click a button (0-9 or A-J) to vote for your answer it will not accept invalid answers please don’t press the GO button as it causes problems

  4. A question to test your zapper What did you drink with your breakfast this morning? • Tea • Coffee • Fruit Juice • Water • Other • Nothing

  5. OPAL

  6. Some Simple Events

  7. Strong Nuclear Force The force between quarks grows with distance !!!!! Energy builds up between them until many quarks are produced that arrange themselves into strong force neutral hadrons – we see jets…

  8. Taus are heavier electrons again – 3500 times heavier… They decay to quarks and electrons/muons in the detector…. Yuk!

  9. The Weak Nuclear Force (Beta Decay) Neutrinos only interact by the weak force – once produced we never see them again… The likelihood that a W will decay to quarks or leptons is the same.. If we produce Ws and count the relative probabilities of outcomes we can count how many quarks there are…

  10. WW Events at LEP The decays are so fast you’ll only see the final products in the detector… Each W can decay to e, m, t plus a neutrino LEPTONIC DECAY Each W can decay to two quarks HADRONIC DECAY

  11. What sort of WW decay is this? • Double hadronic decay • Mixed • Double leptonic decay

  12. What sort of WW decay is this? Double hadronic decay Mixed Double leptonic decay • Double hadronic decay • Mixed • Double leptonic decay

  13. What sort of WW decay is this? • Double hadronic decay • Mixed • Double leptonic decay

  14. What sort of WW decay is this? • Double hadronic decay • Mixed • Double leptonic decay

  15. What sort of WW decay is this? • Double hadronic decay • Mixed • Double leptonic decay

  16. What sort of WW decay is this? • Double hadronic decay • Mixed • Double leptonic decay

  17. What sort of WW decay is this? • Double hadronic decay • Mixed • Double leptonic decay

  18. What sort of WW decay is this? • Double hadronic decay • Mixed • Double leptonic decay

  19. What sort of WW decay is this? • Double hadronic decay • Mixed • Double leptonic decay

  20. What sort of WW decay is this? • Double hadronic decay • Mixed • Double leptonic decay

  21. Events 11-20 (30 sec)

  22. 10 What sort of WW decay is this? • Double hadronic decay • Mixed • Double leptonic decay

  23. 10 What sort of WW decay is this? • Double hadronic decay • Mixed • Double leptonic decay

  24. 10 What sort of WW decay is this? • Double hadronic decay • Mixed • Double leptonic decay

  25. 10 What sort of WW decay is this? • Double hadronic decay • Mixed • Double leptonic decay

  26. 10 What sort of WW decay is this? • Double hadronic decay • Mixed • Double leptonic decay

  27. 10 What sort of WW decay is this? • Double hadronic decay • Mixed • Double leptonic decay

  28. 10 What sort of WW decay is this? • Double hadronic decay • Mixed • Double leptonic decay

  29. 10 What sort of WW decay is this? • Double hadronic decay • Mixed • Double leptonic decay

  30. 10 What sort of WW decay is this? • Double hadronic decay • Mixed • Double leptonic decay

  31. 10 What sort of WW decay is this? • Double hadronic decay • Mixed • Double leptonic decay

  32. Events 21-30 (15 sec)

  33. 7 What sort of WW decay is this? • Double hadronic decay • Mixed • Double leptonic decay

  34. 7 What sort of WW decay is this? • Double hadronic decay • Mixed • Double leptonic decay

  35. 7 What sort of WW decay is this? • Double hadronic decay • Mixed • Double leptonic decay

  36. 7 What sort of WW decay is this? • Double hadronic decay • Mixed • Double leptonic decay

  37. 7 What sort of WW decay is this? • Double hadronic decay • Mixed • Double leptonic decay

  38. 7 What sort of WW decay is this? • Double hadronic decay • Mixed • Double leptonic decay

  39. 7 What sort of WW decay is this? • Double hadronic decay • Mixed • Double leptonic decay

  40. 7 What sort of WW decay is this? • Double hadronic decay • Mixed • Double leptonic decay

  41. 7 What sort of WW decay is this? • Double hadronic decay • Mixed • Double leptonic decay

  42. 7 What sort of WW decay is this? • Double hadronic decay • Mixed • Double leptonic decay

  43. Events 31-40 (15 sec)

  44. 7 What sort of WW decay is this? • Double hadronic decay • Mixed • Double leptonic decay

  45. 7 What sort of WW decay is this? • Double hadronic decay • Mixed • Double leptonic decay

  46. 7 What sort of WW decay is this? • Double hadronic decay • Mixed • Double leptonic decay

  47. 7 What sort of WW decay is this? • Double hadronic decay • Mixed • Double leptonic decay

  48. 7 What sort of WW decay is this? • Double hadronic decay • Mixed • Double leptonic decay

  49. 7 What sort of WW decay is this? • Double hadronic decay • Mixed • Double leptonic decay

  50. 7 What sort of WW decay is this? • Double hadronic decay • Mixed • Double leptonic decay

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