Introduction to QCD slides - P.Hoyer.pdf - High Energy Physics Group

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Instantaneous Coulomb interaction Paul Hoyer Mugla 2010 Understanding charge screening in QCD What went wrong with the nice physical argument of QED? = N _1 * n 2_ c * 3 f 3 Transverse gluons (and quarks) Instantaneous Coulomb interaction = +N 4 * c Vacuum fluctuations of transverse fields Yu. L. Dokshitzer hep-ph/0306287 26 Physical, transverse gluons screen as QED Coulomb gluons give the opposite sign!
In QCD, mass terms can be directly introduced in the lagrangian. In the SM all masses result from “Yukawa interactions” involving the Higgs field, but they are unconstrained by the theory. The quark masses inferred from experiment are: mu = 1.5 ... 3.3 MeV md = 3.5 ... 6.0 MeV ms = 104 ± 30 MeV mc = 1.27 ± .10 GeV mb = 4.20 ± .15 GeV mt = 171.2 ± 2.1 GeV Paul Hoyer Mugla 2010 Quark masses: Nature’s gift } m > ΛQCD , mass effects large Non-relativistic bound states Scale of strong interactions 27
Page 1 and 2: Paul Hoyer Mugla 2010 Introduction
Page 3 and 4: Paul Hoyer Mugla 2010 The Discovery
Page 5 and 6: Paul Hoyer Mugla 2010 The Pion as a
Page 7 and 8: Matter field: Paul Hoyer Mugla 2010
Page 9 and 10: a a Fundamental Representation: ! F
Page 12 and 13: Mesons Paul Hoyer Mugla 2010 Quark
Page 14 and 15: Quarks are for real: Pointlike scat
Page 20 and 21: Paul Hoyer Mugla 2010 Quantum Chrom
Page 22 and 23: Paul Hoyer Mugla 2010 Asymptotic Fr
Page 24 and 25: Paul Hoyer Mugla 2010 Puzzles of QC
Page 28 and 29: Binding energy [meV] 0 -1000 -3000
Page 30 and 31: Paul Hoyer Mugla 2010 Origin of the
Page 32 and 33: √+%&'( !"#$$%$&'()#*%+,-. !" # !"
Page 34 and 35: Paul Hoyer Mugla 2010 34 P. Skands
Page 36 and 37: Paul Hoyer Mugla 2010 The accuracy
Page 38: dσ dX Factorization Theorem Factor
Page 41 and 42: ξ = 1 + = log E + p � � m 2 +
Page 43 and 44: :02 PM e + e - Paul Hoyer Mugla 201
Page 45 and 46: No exclusive amplitudes for charged
Page 47 and 48: Unitarity (white): σtot(s) = � P
Page 49 and 50: Paul Hoyer Mugla 2010 Optical Theor
Page 51 and 52: e�nition Paul Hoyer Mugla 2010 In
Page 53: Cross σσ Sections at NNLO X+1 (R)
Page 56 and 57: Paul Hoyer Mugla 2010 QCD is very s
Page 58 and 59: Measurement of quark and gluon colo
Page 60 and 61: Paul Hoyer Mugla 2010 The CDF Detec
Page 62 and 63: Paul Hoyer Mugla 2010 pp - → jet

Introduction to QCD slides - P.Hoyer.pdf - High Energy Physics Group

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