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pQCD and Hadron Collider Phenomenology

pQCD and Hadron Collider Phenomenology. C.-P. Yuan Michigan State University Taipei Summer Institute National Taiwan University July 21, 2005. (Revised from the lecture notes by Wu-Ki Tung). Quantum Chromodynamics. Why does QCD play such a crucial role in High Energy Phenomenology?.

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pQCD and Hadron Collider Phenomenology

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  1. pQCD and Hadron Collider Phenomenology C.-P. Yuan Michigan State University Taipei Summer Institute National Taiwan University July 21, 2005 (Revised from the lecture notes by Wu-Ki Tung)

  2. Quantum Chromodynamics

  3. 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.

  4. Key concepts: Ultra-violet divergences, bare Green fns, renormalization, RGE, anomalous dimensions, renormalized G.Fs, … etc.

  5. Analogies and correspondences (see later) Analogies and correspondences (see later)

  6. , universal Lepton-hadron Sc. Theory Input extracted by global analysis

  7. partons, gauge bosons, new particles Hadron Collider Physics leptons, hadrons hadrons SM and New physics frag. functions (universal) parton Distributions hadronization models: MC programs jet algorithms

  8. Example: Charm Production in DIS Experiments Flavor excitation Overlap/subtraction Flavor creation 4-flv (M ¹ 0) calculation(ACOT): ~ asln(Q/M) Near Threshold:approx. 3-flv HQ calc.LO-FC (~ as) + O(as2) HE limit: approachesconventional ZM 4-flv LO (FE) + NLO (~ as) In the intermediate region, all three terms are needed to provide an accurate description of the physics.

  9. W t b Important HQ initiated Processes: Top and Higgs Single Top Production: W t b g Higgs Production:

  10. Apply it to Top Quark Phenomenology at Hadron Colliders Tevatron and LHC Beyond the Leading Order in QCD

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