Claude Andre Pruneau

Transverse radial flow effects on two- and three-particle angular correlations

Abstract We use a simple a transverse radial boost scenario coupled to PYTHIA events to illustrate the impact radial flow may have of two- and three-particle correlation functions measured in heavy-ion collisions. We show that modest radial velocities can impart strong modifications to the correlation functions, some of which may be interpreted as same side ridge and away side structure that can mimic conical emission.

Two pion correlations in Au + Au collisions at 10.8-GeV/c per nucleon

Two-particle correlation functions for positive and negative pions have been measured in Au+Au collisions at 10.8GeV/{ital c} per nucleon. The data were analyzed using one- and three-dimensional correlation functions. From the results of the three-dimensional fit the phase space density of pions was calculated. It is consistent with local thermal equilibrium. {copyright} {ital 1997} {ital The American Physical Society}

Analysis of charged-particle–photon correlations in hadronic multiparticle production

In order to analyze data on joint charged-particle/photon distributions from an experimental search (T-864, MiniMax) for disoriented chiral condensate (DCC) at the Fermilab Tevatron collider, we have identified robust observables, ratios of normalized bivariate factorial moments, with many desirable properties. These include insensitivity to many efficiency corrections and the details of the modeling of the primary pion production, and sensitivity to the production of DCC, as opposed to the generic, binomial-distribution partition of pions into charged and neutral species. The relevant formalism is developed and tested in Monte-Carlo simulations of the MiniMax experimental conditions.

METHODS FOR JET STUDIES WITH THREE-PARTICLE CORRELATIONS

We present a method based on three-particle azimuthal correlation cumulants for the study of the interaction of jets with the medium produced in heavy ion collisions at RHIC and LHC where jets cannot be reconstructed on an event-by-event basis with conventional jet finding algorithms. The method is specifically designed to distinguish a range of jet interaction mechanisms such as Mach cone emission, gluon Cerenkov emission, jet scattering, and jet broadening. We discuss how anisotropic flow background conti-butions of second order (e.g.

Search for conical emission with three-particle correlations

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Event-by-event net charge fluctuations

) are suppressed in three-particle azimuthal correlation cumulants, and discussed specific model representations of di-jets, away-side scattering, and Mach cone emission.We present a method based on three-particle azimuthal correlation cumulants for the study of the interaction of jets with the medium produced in heavy ion collisions at RHIC and LHC usable whenever jets cannot be reconstructed on an event-by-event basis with conventional jet finding algorithms. The method yields a model independent correlation function which may be used to study jet structure or search for new phenomena such as conical emission.

Three-particle cumulant study of conical emission

We present preliminary STAR results on three-particle azimuthal angle correlation studies in Au+Au collisions at GeV. The studies are carried out at mid-rapidity between a trigger particle with 3 ≤p⊥≤ 4 GeV/c and two associated particles in 1 ≤p⊥≤ 2 GeV/c. A cumulant analysis reveals finite three-particle azimuthal correlations, dominated by near- and away-side particle correlations consistent with jet production, and jet-flow correlations. We use a two-component model to remove underlying background correlations. This analysis indicates the presence of the conical emission signals in central Au+Au collisions within the model assumptions about background composition and normalization.

Excitation Function of Net Charge Fluctuations at RHIC

We present analyses of event-by-event dynamical net charge fluctuations measured in 130 and 200 GeV Au+Au collisions with the STAR detector. The dynamical net charge fluctuations are evaluated using the ν +-,dyn observable. Dynamical fluctuations measured in Au+Au collisions at 130 and 200 GeV are finite, and exceed charge conservation limits. They deviate from a perfect 1/N scaling and provide an indication that the collision dynamics varies with collision centrality.

Covariance of antiproton yield and source size in nuclear collisions

We discuss the sensitivity of the three-particle azimuthal cumulant method for a search and study of conical emission in central relativistic

Longitudinal dependence of two-particle momentum correlations from the hydrodynamic flow model NEXSPHERIO

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