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Small-x effects in heavy quark production (coord: A.Dainese, H.Jung and R.Vogt)

Small-x effects in heavy quark production (coord: A.Dainese, H.Jung and R.Vogt). GLR-MQ and BK GLR-MQ (J. Qiu, G. Levin. M. Ryskin): small x and DGLAP, non-linear terms and factorization BK (G. Levin, J. Bartels, M. Lublinsky, K. Kutak, L. Motyka, K. Peters): non-linear terms and factorization

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Small-x effects in heavy quark production (coord: A.Dainese, H.Jung and R.Vogt)

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  1. Small-x effects in heavy quark production(coord: A.Dainese, H.Jung and R.Vogt) • GLR-MQ and BK • GLR-MQ (J. Qiu, G. Levin. M. Ryskin): small x and DGLAP, non-linear terms and factorization • BK (G. Levin, J. Bartels, M. Lublinsky, K. Kutak, L. Motyka, K. Peters): non-linear terms and factorization • Comparison of GLR and BK: understanding of gluon enhancement and suppression relative to the linear case (R. Vogt, A. Dainese, K. Peters) • Phenomenological Applications: Heavy Quark Production • non-linear effects at HERA (H. Jung et al.) • Heavy quark production in multiple interaction events • suppression of DDbar cross section at small pt ? • non-linear effects at LHC • Charm production (R. Vogt, A. Dainese, K. Peters) • Beauty production (K. Peters) • Perspectives for experimental observations at LHC (A. Dainese, R. Vogt) • Factorisation and non-linear effects: effective factorisation at large pt, estimates and predictions (K. Peters) HERA-LHC Workshop, DESY, 21-25.03.2005 Andrea Dainese

  2. R GLR-MQ non-linear terms in DGLAP eq. from V.Kolhinen non-linear (quadratic) correction has “–” sign Q2 evolution is slower Refit HERA F2 data, reduces F2 at low x a moderate Q2 xg(x,Q2) at low Q2 (<10 GeV2) and x (<10-3) is larger than in DGLAP HERA-LHC Workshop, DESY, 21-25.03.2005 Andrea Dainese

  3. Non-linear effects in BK equation from K.Kutak × Non-linear part has no impact in the kinematical region of HERA HERA-LHC Workshop, DESY, 21-25.03.2005 Andrea Dainese

  4. GLR-MQ vs BK: gluons R = 5 GeV-1 = 1 fm R = 4 GeV-1 = 0.8 fm Linear (dashed) vs non-linear (solid) in BK with R = 4 GeV-1 Linear (blue) vs non-linear (red) in DGLAP HERA-LHC Workshop, DESY, 21-25.03.2005 Andrea Dainese

  5. Non-linear effects at HERA • Input from H. Jung: • Total xsection F2 • diffraction • multiple scatterings • also in heavy quark production • final state signatures ? • heavy quark correlations HERA-LHC Workshop, DESY, 21-25.03.2005 Andrea Dainese

  6. Non-linear effects at LHC: charm pp @ 14 TeV R = 0.3 fm |y| < 1 R = 1 fm Charm enhancement due to non-linear effects in GLR-MQ Charm suppression due to non-linear effects in BK (will be shown as ratios) IMPORTANT TO-DO: compare at same R! HERA-LHC Workshop, DESY, 21-25.03.2005 Andrea Dainese

  7. Non-linear effects at LHC: beauty bbbar suppression due to non-linear effects in BK R = 0.3 fm GLR-MQ gives small effect (< 15 %) for beauty production, due to the larger scale of the process, relative to charm production HERA-LHC Workshop, DESY, 21-25.03.2005 Andrea Dainese

  8. Perspectives for exp. obs. with ALICE Ratio of simulated ALICE data for D0 production (with GLR-MQ non-linear enhancement) to linear DGLAP results with several sets of parameters. Data: mc = 1.2 GeV, Q2 = 4mt2 and enhancement HERA-LHC Workshop, DESY, 21-25.03.2005 Andrea Dainese

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