PQCD

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2005 Summer School
pQCD and Hadron Collider Phenomenology
C.-P. Yuan Michigan State University Tsinghua
University, Beijing, China July 2005
(Revised from the lecture notes by Wu-Ki Tung)
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Quantum Chromodynamics
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Why does QCD play such a crucial role in High
Energy Phenomenology?

• The parton picture language provides the
  foundation on which all modern particle theories
  are formulated, and all experimental results are
  interpreted.
• The validity of the parton picture is based
  empirically on an overwhelming amount of
  experimental evidence collected in the last 30-40
  years, and theoretically on the Factorization
  Theorems of PQCD.

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Key concepts Ultra-violet divergences, bare
Green fns, renormalization, RGE, anomalous
dimensions, renormalized G.Fs, etc.
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Analogies and correspondences (see later)
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Lepton-hadron Sc.
Theory Input
extracted by global analysis
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Hadron Collider Physics
leptons, hadrons
hadrons
SM and New physics
frag. functions
(universal) parton Distributions
hadronization models MC programs
jet algorithms
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Example Charm Production in DIS Experiments
Flavor creation
Flavor excitation
Overlap/subtraction
4-flv (M ¹ 0) calculation(ACOT)
as ln(Q/M)
HE limit approaches conventional ZM 4-flv LO
(FE) NLO ( as)
Near Threshold approx. 3-flv HQ calc.LO-FC (
as) O(as2)
In the intermediate region, all three terms are
needed to provide an accurate description of the
physics.
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Important HQ initiated Processes Top and Higgs
Single Top Production
W
t
b
g
Higgs Production
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Apply it to Top Quark Phenomenology at Hadron
Colliders
Tevatron and LHC
Beyond the Leading Order in QCD