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Saturation regimes at LHC energies Cudell, Jean-René ; in Czechoslovak Journal of Physics (2004), 54(Suppl. A), 441-444 The effects of saturation and unitarization for hadron-hadron scattering at LHC energies are explored in several models. It is shown that different choices of saturation parameters lead to sizable ... [more ▼] The effects of saturation and unitarization for hadron-hadron scattering at LHC energies are explored in several models. It is shown that different choices of saturation parameters lead to sizable differences in the energy dependence of total cross sections, and to dramatic changes in elastic differential cross sections. [less ▲] Detailed reference viewed: 24 (14 ULg)Interactions at large distances and spin effects in nucleon-nucleon and nucleon-nuclei scattering Cudell, Jean-René ; ; in Physics of Particles and Nuclei (2004), 35(Suppl. 1), 75-78 The momentum transfer dependence of the slopes of the spin-non-flip and spin-flip amplitudes is analyzed. It is shown that the long tail of the hadronic potential in impact parameter space leads, for ... [more ▼] The momentum transfer dependence of the slopes of the spin-non-flip and spin-flip amplitudes is analyzed. It is shown that the long tail of the hadronic potential in impact parameter space leads, for hadron-hadron interactions, to a larger value of the slope for the reduced spin-flip amplitude than for the spin-non-flip amplitude. It is also shown that the preliminary measurement of A(N) obtained by the E950 Collaboration confirms such behavior of the hadron spin-flip amplitude. [less ▲] Detailed reference viewed: 16 (3 ULg)Integral and derivative dispersion relations, analysis of the forward scattering data ; Cudell, Jean-René ; in Eur. Phys. J. (2004), C33 Detailed reference viewed: 8 (0 ULg)A simple model for generalised parton distributions of the pion Lansberg, Jean-Philippe ; ; Cudell, Jean-René et al in Bruncko, D.; Ferencei, J.; Strizenec, P. (Eds.) 12th International Workshop On Deep Inelastic Scattering (DIS 2004) (2004) Detailed reference viewed: 13 (1 ULg)Saturation and non-linear effects in diffractive processes ; Cudell, Jean-René in Burdik, C. (Ed.) 11th International Conference On Symmetry Methods In Physics (SYMPHYS-11) (2004) Detailed reference viewed: 7 (0 ULg)Large-distance effects on spin observables at RHIC ; Cudell, Jean-René ; in Aulenbacher, K.; Bradamante, F.; Bressan, A. (Eds.) et al 16th International Spin Physics Symposium (SPIN 2004) (2004) Detailed reference viewed: 8 (0 ULg)Pion Structure Function and violation of the Momentum Sum Rule Lansberg, Jean-Philippe ; ; Cudell, Jean-René et al in Blin, A. H.; Hiller, B.; Ruivo, M. C. (Eds.) et al Hadron Physics: Effective Theories of Low Energy QCD N°2 (2003) We present a method to evaluate the pion structure functions from a box diagram calculation. Pion and constituent quark fields are coupled through the simplest pseudoscalar coupling. The gamma^* pi -> q ... [more ▼] We present a method to evaluate the pion structure functions from a box diagram calculation. Pion and constituent quark fields are coupled through the simplest pseudoscalar coupling. The gamma^* pi -> q \bar q cross-section is evaluated and related to the structure functions. We then show that the introduction of non-perturbative effects, related to the pion size and preserving gauge invariance, provides us with a straighforward relation with the quark distribution. It is predicted that higher-twist terms become negligible for Q^2 larger than about 2 GeV^2 and that quarks in the pion have a momentum fraction smaller than in the proton. We enlarge the discussion concerning this violation of the momentum sum rule, emphasizing that the sum rule is recovered in the chiral limit and also when the finite size condition is not imposed. [less ▲] Detailed reference viewed: 61 (3 ULg)Confinement and cut-off: A model for the Pion Quark Distribution Function Stassart, Pierre ; ; Cudell, Jean-René et al (2003) The pion structure function is investigated in a simple pseudo-scalar coupling model of pion and constituent quark fields. The imaginary part of the forward Compton scattering amplitude is evaluated. We ... [more ▼] The pion structure function is investigated in a simple pseudo-scalar coupling model of pion and constituent quark fields. The imaginary part of the forward Compton scattering amplitude is evaluated. We show that the introduction of non-perturbative effects, linked through a cut-off to the size of the pion, allows the reproduction of important features of the pion quark distribution function. [less ▲] Detailed reference viewed: 24 (14 ULg)Integral and derivative dispersion relations in the analysis of the data on p p and anti-p p forward scattering Cudell, Jean-René ; ; in Ukrainian Journal of Physics (2003), 48(Nos. 11- 12, 2003), Detailed reference viewed: 9 (0 ULg)Benchmarks for the forward observables at RHIC, the Tevatron-run II, and the LHC Cudell, Jean-René ; ; et al in Physical Review Letters (2002), 89(20), 201801 We present predictions on the total cross sections and on the ratio of the real part to the imaginary part of the elastic amplitude (rho parameter) for present and future pp and pbar p colliders, and on ... [more ▼] We present predictions on the total cross sections and on the ratio of the real part to the imaginary part of the elastic amplitude (rho parameter) for present and future pp and pbar p colliders, and on total cross sections for gamma p -> hadrons at cosmic-ray energies and for gamma gamma-> hadrons up to sqrt{s}=1 TeV. These predictions are based on an extensive study of possible analytic parametrisations invoking the biggest hadronic dataset available at t=0. The uncertainties on total cross sections, including the systematic errors due to contradictory data points from FNAL, can reach 1.9% at RHIC, 3.1% at the Tevatron, and 4.8% at the LHC, whereas those on the rho parameter are respectively 5.4%, 5.2%, and 5.4%. [less ▲] Detailed reference viewed: 43 (7 ULg)A model for the pion structure function ; Cudell, Jean-René ; Cugnon, Joseph et al in Physics Letters B (2002), 547(3-4), 210-218 The pion structure function is investigated in a simple model, where pion and constituent quark fields are coupled through the simplest pseudoscalar coupling. The imaginary part of the forward gamma*pi ... [more ▼] The pion structure function is investigated in a simple model, where pion and constituent quark fields are coupled through the simplest pseudoscalar coupling. The imaginary part of the forward gamma*pi --> gamma*pi evaluated and related to the structure functions. It is shown that the introduction of non-perturbative effects linked to the size of the pion and preserving gauge invariance, allows a connection with the quark distribution. It is predicted that higher-twist terms become negligible for Q(2) larger than similar to 2 GeV2 and that quarks in the pion have a momentum fraction smaller than in the proton case. (C) 2002 Elsevier Science B.V. All rights reserved. [less ▲] Detailed reference viewed: 37 (14 ULg)Hadronic scattering amplitudes: Medium-energy constraints on asymptotic behavior Cudell, Jean-René ; ; et al in Physical Review. D (2002), 65(7), We consider several classes of analytic parametrizations of hadronic scattering amplitudes, and compare their predictions to all available forward data (pp, (p) over barp, pip, Kp, gammap, gammagamma ... [more ▼] We consider several classes of analytic parametrizations of hadronic scattering amplitudes, and compare their predictions to all available forward data (pp, (p) over barp, pip, Kp, gammap, gammagamma, Sigmap). Although these parametrizations are very close for rootsgreater than or equal to9 GeV, it turns out that they differ markedly at low energy, where a universal Pomeron term similar toln(2)s enables one to extend the fit down to roots=4 GeV. [less ▲] Detailed reference viewed: 22 (5 ULg)Erratum to: “Perturbative evolution and Regge behaviour”: [Phys. Lett. B 448 (1999) 281] Cudell, Jean-René ; ; in Physics Letters B (2002), 528 Detailed reference viewed: 8 (0 ULg)Forward observables at RHIC, the Tevatron Run II and the LHC Cudell, Jean-René ; ; et al in Fiore, R.; Jenkowszky, L. (Eds.) DIFFRACTION 2002, Interpretation of the New Diffractive Phenomena in Quantum Chromodynamics and in the S-Matrix Theory (2002) We present predictions on the total cross sections and on the ratio of the real part to the imaginary part of the elastic amplitude (rho parameter) for present and future pp and pbar p colliders, and on ... [more ▼] We present predictions on the total cross sections and on the ratio of the real part to the imaginary part of the elastic amplitude (rho parameter) for present and future pp and pbar p colliders, and on total cross sections for gamma p -> hadrons at cosmic-ray energies and for gamma gamma -> hadrons up to sqrt(s)=1 TeV. These predictions are based on a study of many possible analytic parametrisations and invoke the current hadronic dataset at t=0. The uncertainties on total cross sections, including the systematic theoretical errors, reach 1% at RHIC, 3% at the Tevatron, and 10% at the LHC, whereas those on the rho parameter are respectively 10%, 17%, and 26%. [less ▲] Detailed reference viewed: 24 (7 ULg)The Valence Quark Distribution of the Pion Lansberg, Jean-Philippe ; ; Cudell, Jean-René et al in Dong Su; Burchat, Patricia (Eds.) XXII Physics in Collision Conference (PIC02) (2002) Detailed reference viewed: 32 (5 ULg)A full-acceptance detector at the LHC (FELIX) ; ; et al in Journal of Physics : G Nuclear & Particle Physics (2002), 28(6), 117-215 The FELIX collaboration had proposed the construction of a full-acceptance detector for the LHC. The primary mission of FELIX was the study of QCD: to provide comprehensive and definitive observations of ... [more ▼] The FELIX collaboration had proposed the construction of a full-acceptance detector for the LHC. The primary mission of FELIX was the study of QCD: to provide comprehensive and definitive observations of a very broad range of strong-interaction processes. This document contains an extensive discussion of this physics menu. In a further paper the FELIX detector will be reviewed. [less ▲] Detailed reference viewed: 40 (18 ULg)Consequences of t-channel unitarity for the interaction of real and virtual photons at high energies ; Cudell, Jean-René ; in Jenkovsky, L.; Fiore, R. (Eds.) DIFFRACTION 2002: INTERPRETATION OF THE NEW DIFFRACTIVE PHENOMENA IN QUANTUM CHROMODYNAMICS AND IN THE S - MATRIX THEORY (2002) Detailed reference viewed: 13 (0 ULg)Analytic amplitudes for hadronic forward scattering: COMPETE update ; Cudell, Jean-René ; et al in Bentvelsen, S.; de Jong, P.; Koch, J. (Eds.) et al ICHEP 2002 (2002) Detailed reference viewed: 5 (0 ULg)Overview of the COMPETE program. ((V)) ; Cudell, Jean-René ; et al in Jenkovsky, L.; Fiore, R. (Eds.) DIFFRACTION 2002: INTERPRETATION OF THE NEW DIFFRACTIVE PHENOMENA IN QUANTUM CHROMODYNAMICS AND IN THE S - MATRIX THEORY (2002) Detailed reference viewed: 35 (2 ULg)Consequences of t-channel unitarity for gamma(*) p and gamma(*) gamma(*) amplitudes Cudell, Jean-René ; ; in Bentvelsen, S.; de Jong, P.; Koch, J. (Eds.) et al ICHEP 2002 (2002) Detailed reference viewed: 7 (0 ULg) |
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