Transparencies pdf - Desy

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Goal for LHC - realistic account of the transverse structure of the nucleon and of the onset of Black Disk Limit on the global structure of the events with Higgs, SUSY,... For inclusive cross section at high virtuality transverse structure does not matter - convolution of parton densities For multiple collisions - which have large probability at LHC - rates scale as 1/(transverse area occupied by partons), depend on the shape of the transverse distribution and on the degree of the overlap Current MC’s of pp collisions at LHC/ Tevatron do not include constrains on the transverse structure of the nucleon originating from HERA studies. 2 2
Outline • Imaging a fast nucleon. • Onset of black regime of interaction for small dipoles • Centrality trigger for pp collisions. • Forward hadron production - LHC & cosmic rays 3 3
Page 1: HERA impact for QCD dynamics at LHC
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 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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