A Schematic detector
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A Schematic detector
Hadronic
layers
Tracking system Magnetized volume
CalorimeterInduces shower
in dense material
Innermost tracking layers
use silicon
Muon detector
Interactionpoint
Absorber material
Bend angle momentum
Electron
Experimental signature of a quark or gluon
Muon
Jet: q or g
“Missing transverse energy”
Signature of a non-interacting (or weaklyinteracting) particle like a neutrino
EM layersfine sampling
p p
Jet Production
1P
2P
1xfi11Px
22Px
1jet
2jet
sij
2xf j
,,,ˆ
,,
2
2
2
22
2211
22
2121
RFRsij
ijFjFi
QQPxPx
xfxfdxdx
2R
1.3R
Collisions at the Tevatron
Advantages (re e+e-)• High Energy• Hard Scatter is QCD
Disadvantages (re e+e-)
• Don’t know what’s colliding
• Underlying Event
• Hard Scatter is QCD
UnderlyingEvent
u
u
d
gq
q u
u
d
Hard Scatterproton anti-proton
Arbitrary Definitions: Heavy Flavor c and b
)(z, (m)...),z,,x,(x ),(x ),(x dz dx dx X)H (AB s21ij2121Q ]Q[HQji
ijDˆff
ij
fi (x1)
fj (x2)
DQH(z)
Q
Q
A
B
Incoming Particles
Hard Interaction
Parton Shower / Fragmentation
M(Q) >> qcd means
• perturb calc for (NLO is normal)
• higher order effects from dep on R,F
Universal non-perturb parts
• PDFs and fragmentation
• take from other meas’s
• or meas using Q-prod
ij