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

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Presentation on theme: "Scoperta dei flavors del Modello Standard ,b,t,,  Lezione 18."— Presentation transcript:

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 mass 1,777GeV lifetime 3× s

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

6 La scopertta del b

7 Fermilab,Chicago 1977 Leon Lederman QUARK b fixed target experiment on berillium cleo, cornell decdimento di un B-meson TASSO,DESY drift chambers beam pipe time-of-light counters 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 11 연세대 입자물리 실험실 강의 series (2) 2002/11/15 How to see “ top ” quarks? and

12 CDF Detector

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

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

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

16 la scoperta del  tevatron FNAL DONUT

17 Detection of  – a challenge! n Experiment: DONUT (Direct Observation of the NU T au)at FermiLab accelerator. n Out of neutrinos, only 1000 interactions record ed,out of which 4 were identified as  2000 n 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 18 연세대 입자물리 실험실 강의 series (2) 2002/11/15

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

20


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