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

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Paul Hoyer Mugla 2010 Removing IR sensitivity in QCD In QCD even soft gluons can change the color of the quark ⇒ we can never measure the color of a quark! Also: Want to sum over all soft and collinear divergences up to a “Factorization scale” µ, large enough to apply PQCD for Q > µ. Define IR safe cross sections, which can be calculated in PQCD using the factorization theorem, and measured in experiments. 50
e�nition Paul Hoyer Mugla 2010 Infrared Safe observables An obser vable is infrared safe if it is insensitive to SOFT radiation: Adding any number of infinitely soft particles should not change the value of the obser vable COLLINEAR radiation: Splitting an existing particle up into two comoving particles each with half the original momentum should not change the value of the obser vable 51 P. Skands
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 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: Paul Hoyer Mugla 2010 Optical Theor
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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