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Dive into the research topics where Nicolas Borghini is active.

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Featured researches published by Nicolas Borghini.


Physical Review C | 2001

Flow analysis from multiparticle azimuthal correlations

Nicolas Borghini; Phuong Mai Dinh; Jean-Yves Ollitrault

We present a new method for analyzing directed and elliptic flow in heavy-ion collisions. Unlike standard methods, it separates the contribution of flow to azimuthal correlations from contributions due to other effects. The separation relies on a cumulant expansion of multiparticle azimuthal correlations, and includes corrections for detector inefficiencies. This new method allows the measurement of the flow of identified particles in narrow phase-space regions, and can be used in every regime, from intermediate to ultrarelativistic energies.


Physical Review C | 2001

New method for measuring azimuthal distributions in nucleus-nucleus collisions

Nicolas Borghini; Phuong Mai Dinh; Jean-Yves Ollitrault

The methods currently used to measure azimuthal distributions of particles in heavy-ion collisions assume that all azimuthal correlations between particles result from their correlation with the reaction plane. However, other correlations exist, and it is safe to neglect them only if azimuthal anisotropies are much larger than


Physics Letters B | 2005

Elliptic flow and incomplete equilibration at RHIC

Rajeev S. Bhalerao; Jean-Paul Blaizot; Nicolas Borghini; Jean-Yves Ollitrault

1/\sqrt{N},


Physics Letters B | 2006

Momentum spectra, anisotropic flow, and ideal fluids

Nicolas Borghini; Jean-Yves Ollitrault

with N the total number of particles emitted in the collision. This condition is not satisfied at ultrarelativistic energies. We propose a new method, based on a cumulant expansion of multiparticle azimuthal correlations, which allows measurements of much smaller values of azimuthal anisotropies, down to


Physical Review C | 2000

Is the analysis of flow at the CERN Super Proton Synchrotron reliable

Nicolas Borghini; Phuong Mai Dinh; Jean-Yves Ollitrault

1/N.


Physical Review D | 2001

Anomalies and Fermion Content of Grand Unified Theories in Extra Dimensions

Nicolas Borghini; Yves Gouverneur; Michel H. G. Tytgat

It is simple to implement and can be used to measure both integrated and differential flow. Furthermore, this method automatically eliminates the major systematic errors, which are due to azimuthal asymmetries in the detector acceptance.


Physics Letters B | 2000

Effects of HBT correlations on flow measurements

Phuong Mai Dinh; Nicolas Borghini; Jean-Yves Ollitrault

Abstract We argue that RHIC data, in particular those on the anisotropic flow coefficients v 2 and v 4 , suggest that the matter produced in the early stages of nucleus–nucleus collisions is incompletely thermalized. We interpret the parameter ( 1 / S ) ( d N / d y ) , where S is the transverse area of the collision zone and d N / d y the multiplicity density, as an indicator of the number of collisions per particle at the time when elliptic flow is established, and hence as a measure of the degree of equilibration. This number serves as a control parameter which can be varied experimentally by changing the system size, the centrality or the beam energy. We provide predictions for Cu–Cu collisions at RHIC as well as for Pb–Pb collisions at the LHC.


Physical Review C | 2002

Effects of momentum conservation on the analysis of anisotropic flow

Nicolas Borghini; Phuong Mai Dinh; Jean-Yves Ollitrault; A. M. Poskanzer; Sergei A. Voloshin

Abstract If the matter produced in ultrarelativistic heavy-ion collisions reaches thermal equilibrium, its subsequent evolution follows the laws of ideal fluid dynamics. We show that general predictions can be made on this basis alone, irrespective of the details of the hydrodynamical model. We derive several scaling rules for momentum spectra and anisotropic flow (in particular the elliptic flow, v 2 , and the hexadecupole flow, v 4 ) of identified particles. Comparison with existing data is briefly discussed, and qualitative predictions are made for LHC.


Journal of Physics G | 2000

Possible cosmological implications of the quark-hadron phase transition

Nicolas Borghini; W N Cottingham; R. Vinh Mau

Several heavy ion experiments at SPS have measured azimuthal distributions of particles with respect to the reaction plane. These distributions are deduced from two-particle azimuthal correlations under the assumption that they result solely from correlations with the reaction plane. In this paper, we investigate other sources of azimuthal correlations: transverse momentum conservation, which produces back-to-back correlations, resonance decays, HBT correlations and final state interactions. These correlations increase with impact parameter: most of them vary with the multiplicity N like 1/N. When they are taken into account, the experimental results of the NA49 collaboration at SPS are significantly modified. These correlations might also explain an important fraction of the pion directed flow observed by WA98. Data should be reanalyzed taking into account carefully these non--flow correlations.


European Physical Journal C | 2012

Heavy quarkonia in a medium as a quantum dissipative system: master-equation approach

Nicolas Borghini; Clément Gombeaud

The restrictions imposed by anomaly cancellation on the chiral fermion content of nonsupersymmetric gauge theories based on various groups are studied in spacetime dimension D = 6, 8, and 10. In particular, we show that the only mathematically consistent chiral SU(5) theory in D = 6 contains three nonidentical generations.

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Rajeev S. Bhalerao

Tata Institute of Fundamental Research

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J-Y Ollitrault

Centre national de la recherche scientifique

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Jean-Yves Ollitrault

Pierre-and-Marie-Curie University

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A. M. Poskanzer

Lawrence Berkeley National Laboratory

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Francois Gelis

Centre national de la recherche scientifique

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