Jets and QCD in
D0 Experiment
Physics at Extreme
Energies
Hanoi, Vietnam July 23, 2000
V. Šimák
Institute of Physics ASCR, Prague
for the D Collaborations
Tit le:
d0logo. eps
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Outline
pp J1 (J2) anything
• Inclusive Jet Cross Section : d 2
– at 1800 GeV
– at 630 GeV
dET d
– Ratio of Inclusive Jet Cross Sections
• Dijet Triple Differential Cross Section
d 3
dET d1d2
• Dijet Mass Spectrum
f a / A x1
jet 1
All theoretical x1P1
P1
comparisons done
ˆ s
with JETRAD f b / B x2
P2
x2 P2
jet 2
(p1p2 2 jets)
dx dx
1 f
2 a/ A x1 fb / B x2 (ab cd )
ˆ
abcd
Hanoi, July 23, V. Šimák 2
2000
y
_
p
p
x
z
- ln [ tan (q / 2) ] Transverse
segmentation
|| 60 GeV
Probe Jet : ET > 30 GeV
No restriction on additional jets.
Measurement as input to PDF’s:
gluon distribution is most interesting.
Both experiments use JETRAD for
theoretical comparisons with different
PDF’s.
Hanoi, July 23, V. Šimák 9
2000
Dijet Triple Differential Cross
Section (D)
OS SS
Beam line
• Divide data sample into four eta bins:
-- 0.0 2.4 TeV
no new physics so far
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