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Scoperta dei flavors del Modello Standard  ,b,t, , 

Scoperta dei flavors del Modello Standard  ,b,t, , . Lezione 18. La scoperta del neutrino . La scoperta del . SPEAR SLAC 1970. MARKI.  events. tasso petra Hamburg. tasso petra Hamburg. mass 1,777GeV lifetime 3 ×10 -13 s.

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Scoperta dei flavors del Modello Standard  ,b,t, , 

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  1. Scoperta dei flavors del Modello Standard ,b,t,, Lezione 18

  2. La scoperta del neutrino 

  3. La scoperta del  SPEAR SLAC 1970 MARKI

  4.  events tasso petra Hamburg tasso petra Hamburg mass 1,777GeV lifetime 3×10-13 s

  5. Perchè erano così sicuri che si tratttava di un leptone?

  6. La scopertta del b

  7. QUARK b drift chambers beam pipe time-of-light counters Fermilab,Chicago 1977 Leon Lederman decdimento di un B-meson fixed target experiment on berillium cleo, cornell TASSO,DESY tracce sparpagliate, presenza di un , presenza di tracce originate molto vicine al vertice di interazione

  8. shower counter  absorber

  9. DELPHI,LEP è stato osservato al LEP

  10. la scoperta del top tevatron FNAL CDF,DO

  11. How to see “top” quarks? and 연세대 입자물리 실험실 강의 series (2) 2002/11/15

  12. CDF Detector

  13. “top” quark event : one lepton + 4 jets CDF

  14. “top” quark event : di-lepton + 2 jets CDF

  15. Mass of top quark • Each top candidate is fit to obtain Mrec • kinematical constraints to b-jets and light-q-jets • missing transverse energy for neutrino • max. likelihood fit to obtain mass from a sample of candidate events CDF, PRL (1998) world average 연세대 입자물리 실험실 강의 series (2) 2002/11/15

  16. la scoperta del  tevatron FNAL DONUT

  17. Detection of  – a challenge! Experiment: DONUT (Direct Observation of the NU Tau)at FermiLab accelerator. Out of 1013 neutrinos , only 1000  interactions recorded,out of which 4 were identified as  2000 DONUT searched for decays into 1 charged particle (86% of taon decays) •  has to produce a  lepton • one has to track a  •  lifetime is 3x10-13 sec (ct=90 µm) use emulsion

  18. 연세대 입자물리 실험실 강의 series (2) 2002/11/15

  19. 연세대 입자물리 실험실 강의 series (2) 2002/11/15

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