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Published byReilly Maulden Modified over 9 years ago
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Scoperta dei flavors del Modello Standard ,b,t,, Lezione 18
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La scoperta del neutrino
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La scoperta del SPEAR SLAC 1970 MARKI
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events tasso petra Hamburg mass 1,777GeV lifetime 3×10 -13 s
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Perchè erano così sicuri che si tratttava di un leptone?
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La scopertta del b
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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
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shower counter absorber
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DELPHI,LEP è stato osservato al LEP
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la scoperta del top tevatron FNAL CDF,DO
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11 연세대 입자물리 실험실 강의 series (2) 2002/11/15 How to see “ top ” quarks? and
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CDF Detector
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“ top ” quark event : one lepton + 4 jets CDF
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“ top ” quark event : di-lepton + 2 jets CDF
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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
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la scoperta del tevatron FNAL DONUT
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Detection of – a challenge! n Experiment: DONUT (Direct Observation of the NU T au)at FermiLab accelerator. n Out of 10 13 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
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18 연세대 입자물리 실험실 강의 series (2) 2002/11/15
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19 연세대 입자물리 실험실 강의 series (2) 2002/11/15
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