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In order to analyze the strengths of interaction with the gluon fields at small x it is convenient to consider virtual photon - nucleon scattering in the nucleon rest frame. Space-time picture of DIS, exclusive vector meson production - a three step process: ● transition γ ∗ → h where h are various configurations long before the target: ● ● lcoh ∼ c(Q 2 )q0/Q 2 ,c(Q 2 ) ≤ 1 Slow evolution of this wave package. q ¯q,q ¯qg... interaction of the evolved configurations with the target, formation of the final state. 24 24
Convenient to introduce a notion of the cross section of the interaction of a small dipole with the nucleon. Such a cross section can be legitimately calculated in the leading log approximation. One can also try to extend it to large size dipoles hoping that a reasonably smooth matching with nonperturbative regime is possible. Sensitive to mq in nonperturbative regime - real photon size constrain → mq ~ 300 MeV for u & d quarks. A delicate point: in pQCD the cross section depends both on the transverse separation between quark and antiquark and the off-shellness (virtuality) of the probe which produced the q ¯q pair. In most of the models on the market this is ignored. 25 25
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 26 and 27: Consider first “small dipole - ha
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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