scoperta dei flavors del modello standard ,b,t,, lezione 18
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Scoperta dei flavors del Scoperta dei flavors del Modello Standard Modello Standard
,b,t,,,b,t,,
Lezione 18Lezione 18
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La scoperta del La scoperta del neutrino neutrino
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La scoperta del SPEAR
SLAC
1970
MARKI
ee
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eventstasso petra Hamburg
tasso petra Hamburg
mass 1,777GeV
lifetime 3×10-13 s
ee
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Perchè erano così sicuri Perchè erano così sicuri che si tratttava di un che si tratttava di un
leptone?leptone?
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La scopertta del bLa scopertta del b
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bbGeV )46.9( Fermilab,Chicago 1977
Leon Lederman
QUARK QUARK bb
.., eepp
fixed target experiment on berillium
cleo, cornell
eeee 21***
ee
1
2
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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XmesonBee
shower counter
absorber
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jetsbbZ 20
DELPHI,LEP
lulb
è stato osservato al LEP
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la scoperta del topla scoperta del top
tevatron FNALtevatron FNAL
CDF,DOCDF,DO
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연세대 입자물리 실험실 강의 series (2) 2002/11/15 11
How to see “top” quarks?How to see “top” quarks?
Xttpp
or '
qqW
bWt
or '
qqW
bWt
and
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CDF DetectorCDF Detector
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““top” quark event : top” quark event : one lepton one lepton + 4 jets+ 4 jets
CDF
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““top” quark event : top” quark event : di-lepton di-lepton + 2 jets+ 2 jets
CDF
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연세대 입자물리 실험실 강의 series (2) 2002/11/15 15
Mass of top quarkMass of top quark
CDF, PRL (1998)
Each top candidate is fit to obtain Mrec
kinematical constraints tob-jets and light-q-jets
missing transverse energy for neutrino max. likelihood fit to obtain mass
from a sample of candidate events
1.53.174
(GeV) 3.58.49.175)(
tm
world average
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la scoperta del la scoperta del
tevatron FNAL
DONUT
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Detection of Detection of – a – a challenge!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 emulsionuse emulsion
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연세대 입자물리 실험실 강의 series (2) 2002/11/15 18
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