Author
P. Valin
Bio: P. Valin is an academic researcher from McGill University. The author has contributed to research in topics: Gluon & Quantum chromodynamics. The author has an hindex of 9, co-authored 14 publications receiving 275 citations.
Topics: Gluon, Quantum chromodynamics, Inelastic scattering, Hadron, Tevatron
Papers
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TL;DR: In this article, the preliminary SPS p p collider results strongly suggest that the elastic p p profile becomes more opaque and edgier and increases in range (Blacker, Edgier, Larger or BEL behaviour) compared to the elastic pp profile at the ISR.
52 citations
TL;DR: The inclusion of a real part for the elastic amplitude, the removal of multiple diffraction zeros, and the behavior of the model up to the multi-TeV energy range (the Froissart bound is not saturated) are discussed.
Abstract: We study elastic diffraction in the pp and p-barp channels at high energies through an eikonal model, built in impact-parameter space out of QCD and parton-model concepts. The eikonal function is separated into two terms, a constant contribution from valence quarks and a gluon-fusion-initiated term. The latter is responsible for the whole energy dependence of the model at high energies. We discuss the inclusion of a real part for the elastic amplitude, the removal of multiple diffraction zeros, and the behavior of our model up to the multi-TeV energy range (the Froissart bound is not saturated). We find excellent agreement with a large body of experimental data.
46 citations
TL;DR: In this article, the authors argue that the observation by UA4 of a high energy ρ value (real-to-imaginary ratio of the forward p p amplitude) in excess of what had been predicted is accommodated by QCD.
40 citations
TL;DR: Using Fermilab Tevatron experiment E710 results, it is deduced that {rho} at 546 GeV is well below the central UA4 value of 0.24, defusing this number as a crucial issue.
Abstract: Production of gluon jets becomes a feature of average hadron collisions for multi-TeV energies, leading to a model where interactions are mostly mediated by semihard gluons. We calculate forward scattering in this model as the shadow of the large inelastic cross sections associated with gluon jets. Using Fermilab Tevatron experiment E710 results, we deduce that {rho} at 546 GeV is well below the central UA4 value of 0.24, defusing this number as a crucial issue.
33 citations
TL;DR: In this article, it was shown that the proton turns BEL (Blacker, Edgier, Larger) as its energy increases from the CERN ISR to the collider, and it seems to be tending slowly toward the step-function profile of the famous Froissart-Martin bound.
28 citations
Cited by
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TL;DR: Based on QCD-inspired models for multiple jets production, the authors developed a Monte Carlo program to study jet and the associated particle production in high energy pp, pA and AA collisions.
722 citations
TL;DR: It is argued that hadronic events contain a varying number of semihard parton-parton interactions, with an average interaction rate given by perturbative QCD, and the variation between different events given by Poissonian statistics for each impact parameter separately.
Abstract: A detailed model for hadronic events is presented, with particular emphasis put on the event structure at low transverse momenta, i.e., ``beam jets'' and ``minijets.'' Specifically, we argue that hadronic events contain a varying number of semihard parton-parton interactions, with an average interaction rate given by perturbative QCD, and the variation between different events given by Poissonian statistics for each impact parameter separately. Comparisons with data are presented for a number of properties, such as multiplicity distributions, forward-backward correlations, minijet phenomenology, and the ``pedestal effect.'' Also, predictions for the behavior at higher energies are included.
626 citations
TL;DR: The physical basis and some applications of an efficient event generator designed for Monte Carlo simulations of atmospheric cascades at ultrahigh energies are described.
Abstract: We describe the physical basis and some applications of an efficient event generator designed for Monte Carlo simulations of atmospheric cascades at ultrahigh energies. The event generator (sibyll) incorporates many features of the Lund programs, but emphasizes the fragmentation region and the production of minijets. A consistent treatment of hadron-hadron and hadron-nucleus interactions is emphasized. Examples of applications are the calculation of coincident muons observed in deep underground detectors and the simulation of the longitudinal development of air shower components in the atmosphere.
367 citations
TL;DR: In this article, a detailed account is given of correlated flavour, colour, longitudinal and transverse momentum distributions, encompassing both the partons initiating perturbative interactions and the partsons left in the beam remnants.
Abstract: Recent experimental data have established some of the basic features of multiple interactions in hadron-hadron collisions. The emphasis is therefore now shifting, to one of exploring more detailed aspects. Starting from a brief review of the current situation, a next-generation model is developed, wherein a detailed account is given of correlated flavour, colour, longitudinal and transverse momentum distributions, encompassing both the partons initiating perturbative interactions and the partons left in the beam remnants. Some of the main features are illustrated for the Tevatron and the LHC.
265 citations
TL;DR: In this article, a critical review of all the data produced at the ISR on proton-proton elastic scattering and total cross sections is presented, which is used to compute the impact parameter distribution of the inelastic overlap integral.
236 citations