A Schematic detector

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description

p.  p. A Schematic detector. Muon detector. Calorimeter Induces shower in dense material. Tracking system Magnetized volume. Interaction point. Innermost tracking layers use silicon. EM layers fine sampling. Absorber material. Hadronic layers. Electron. - PowerPoint PPT Presentation

Transcript of A Schematic detector

Page 1: A Schematic detector
Page 2: A Schematic detector

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

Page 3: A Schematic detector

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

Page 4: A Schematic detector

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

Page 5: A Schematic detector

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