HIJING 1.0: A Monte Carlo program for parton and particle production in high energy hadronic and nuclear collisions

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.

A multiple-interaction model for the event structure in hadron collisions

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.

/pdf/sibyll-an-event-generator-for-simulation-of-high-energy-3vma10yra2.pdf

SIBYLL: An event generator for simulation of high energy cosmic ray cascades.

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.

/pdf/multiple-interactions-and-the-structure-of-beam-remnants-dhkf0rbslf.pdf

Multiple interactions and the structure of beam remnants

https://cds.cern.ch/record/133724/files/198002209.pdf

Impact parameter interpretation of proton-proton scattering from a critical review of all ISR data

Towards a blacker, edgier and larger proton

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.

Quark-gluon model for diffraction at high energies

Forward scattering amplitudes in semi-hard QCD

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.

P. Valin

Papers

Towards a blacker, edgier and larger proton

Quark-gluon model for diffraction at high energies

Forward scattering amplitudes in semi-hard QCD

Theoretical implications of Fermilab Tevatron total and elastic differential-cross-section measurements.

Does the proton look BEL at super-t and supercolliders?