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Measurement of the Sensitivity of Two-Particle Correlations in pp Collisions to the Presence of Hard Scatterings.
Phys Rev Lett
October 2023
CERN, Geneva, Switzerland.
Article Synopsis
- - The study investigates the "ridge" phenomenon in high-energy proton-proton (pp) collisions, focusing on the correlation between particles in the underlying event and scattering processes like jets.
- - Using data from the ATLAS experiment at the LHC, researchers analyzed two-particle correlations in pp collisions at 13 TeV, looking at different configurations with and without charged particles related to jets.
- - The findings indicate that excluding jet-associated particles does not change the correlations, and there is no significant relationship between jet particles and the underlying event, suggesting that hard scattering does not contribute to the observed ridge effect.
Exposing the noncollectivity in elliptic flow.
Phys Rev Lett
July 2009
Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
We show that backward-forward elliptic anisotropy correlation provides an experimentally accessible observable which distinguishes between collective and noncollective contributions to the observed elliptic anisotropy v_{2} in relativistic heavy ion collisions. The measurement of this observable will reveal the momentum scale at which collective expansion seizes and where the elliptic anisotropy is dominated by (semi)hard processes.
View Article and Find Full Text PDFSemihard scattering unraveled from collective dynamics by two-pion azimuthal correlations in 158A GeV/c Pb+Au collisions.
Phys Rev Lett
January 2004
Gesellschaft für Schwerionenforschung (GSI), 64291 Darmstadt, Germany.
Elliptic flow and two-particle azimuthal correlations of charged hadrons and high-p(T) pions (p(T)>1 GeV/c) have been measured close to midrapidity in 158A GeV/c Pb+Au collisions by the CERES experiment. Elliptic flow (v(2)) rises linearly with p(T) to a value of about 10% at 2 GeV/c. Beyond p(T) approximately 1.
View Article and Find Full Text PDFProduction mechanism of quark-gluon plasma in heavy-ion collisions.
Phys Rev Lett
September 2003
Department of Physics, IIT Kanpur, Kanpur-208 016, India.
A general scheme is proposed here to describe the production of semihard and soft quarks and gluons that form the bulk of the plasma in ultrarelativistic heavy-ion collisions. We show how to obtain the production rates in the extended phase space, including the color part, as a function of time in a consistent manner and without having to make ad hoc assumptions. All the required features-the back reaction on QCD vacuum, the non-Markovian nature of the production, and the quasi particle nature of the partons-are naturally incorporated.
View Article and Find Full Text PDFProton breakup in high-energy pA collisions from perturbative QCD.
Phys Rev Lett
March 2003
Physics Department, Brookhaven National Laboratory, Upton, New York 11973, USA.
We argue that the distribution of hadrons near the longitudinal light cone in central high-energy pA collisions is computable in weak coupling QCD. This is because the density of gluons per unit transverse area in the dense target at saturation provides an intrinsic semihard momentum scale, Q(s). We predict that the longitudinal distribution of (anti)baryons and mesons steepens with increasing energy and atomic number of the target and that the transverse momentum distribution broadens.
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