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Consider first “small dipole - hadron” cross section d σinel = π2 3 F2 d 2 αs(λ/d 2 )xGT(x.λ/d 2 ) F 2 Casimir operator of color SU(3) F 2 F 2 (quark) =4/3 (gluon)=3 Comment: This simple picture is valid only in LO. NLO would require introducing mixing of different components. Also, in more accurate expression there is an integral over x, and and extra term due to quark exchanges 26 Baym et al 93 26
HERA data confirm increase of the cross sections of small dipoles predicted by pQCD 2 (d , x, Q ) (mb) qqN − ! 45 40 35 Hard 30 Regime 25 20 15 10 5 0 0 " " 0.1 Matching Region = 4 x = 0.0001 = 10 0.2 0.3 0.4 0.5 d (fm) 0.6 x = 0.001 x = 0.01 The interaction cross-section, ˆσ for CTEQ4L, x = 0.01, 0.001, 0.0001, λ = 4, 10. Based on pQCD expression for ˆσ at small dt, soft dynamics at large b, and smooth interpolation. Provides a good description of F2p at HERA and J/ψ photoproduction. Frankfurt, Guzey, McDermott, MS 2000-2001 0.7 0.8 Provided a reasonable prediction for σL 27 Soft Regime 0.9 1 27
Page 1 and 2: HERA impact for QCD dynamics at LHC
Page 3 and 4: Outline • Imaging a fast nucleon.
Page 5 and 6: Image of nucleon at different resol
Page 7 and 8: z-x cut of the fast nucleon the rat
Page 9: Implication - hard processes corres
Page 12: )'
Page 16 and 17: Binkley et al .9:%);3*&#55:?3:4#@&3
Page 19 and 20: 2! " F g (x, ", Q 2 ) / fm -1 2 1 0
Page 22 and 23: Experimentally one measures the rat
Page 24 and 25: In order to analyze the strengths o
Page 28 and 29: Impact parameter distribution in
Page 30 and 31: Can use hard diffraction to check p
Page 33 and 34: (P gg ⊗ g) / g 1.4 1.2 1 0.8 0.6
Page 35 and 36: | Γ pp (b) | 2 Study of the elasti
Page 37 and 38: 2 ! b P in (b) / fm -1 1 0.8 0.6 0.
Page 39 and 40: Impact parameter distribution for a
Page 41 and 42: New phenomena when going to LHC ene
Page 43: To estimate the maximum transverse
Page 46 and 47: pp→h+X Z 1 dN = ∑ dxx fa(x,Q N
Page 48 and 49: Cosmic rays of ultrahigh energies:
Page 50 and 51: P H Y S I C A L R E V I E W L E T T
Page 54: | Γ pp (b) | 2 Warning - it is not

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