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

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Mesons Paul Hoyer Mugla 2010 Quark Model classification of Hadrons q¯q Hadrons may be formed with any combination of q = u,d,s,c,b,t π + Free quarks have never been seen: p Baryons qqq Were quarks mere mathematical rules, or true particles? (Gell-Mann) 12
Paul Hoyer Mugla 2010 Quarks have Color Three quark colors were introduced by O.W. Greenberg in 1964, to make the quark model of the proton compatible with the Pauli exclusion principle: Baryon wave functions must be antisymmetric under the interchange of quarks. In the Quark Model, the space – spin wf is symmetric. The color wf is antisymmetric, rescuing the Pauli principle. The antisymmetric color wave function (A,B,C = red, blue, yellow) means that the proton is a color singlet (does not change under gauge transformations). Mesons are also color singlets: |π〉 = � A q A ¯q A |p〉 = � A,B,C U|p〉 = |p〉 U|π〉 = |π〉 εABCq A q B q C 13
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 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 26 and 27: Instantaneous Coulomb interaction P
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
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Introduction to QCD slides - P.Hoyer.pdf - High Energy Physics Group

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