47 research outputs found
Effect of event selection on jetlike correlation measurement in d+Au collisions at sNN=200Â GeV
AbstractDihadron correlations are analyzed in sNN=200Â GeV d+Au collisions classified by forward charged particle multiplicity and zero-degree neutral energy in the Au-beam direction. It is found that the jetlike correlated yield increases with the event multiplicity. After taking into account this dependence, the non-jet contribution on the away side is minimal, leaving little room for a back-to-back ridge in these collisions
Beam-energy Dependence Of Charge Balance Functions From Au + Au Collisions At Energies Available At The Bnl Relativistic Heavy Ion Collider
Conselho Nacional de Desenvolvimento CientĂfico e TecnolĂłgico (CNPq)Balance functions have been measured in terms of relative pseudorapidity (Δη) for charged particle pairs at the BNL Relativistic Heavy Ion Collider from Au + Au collisions at sNN=7.7GeV to 200 GeV using the STAR detector. These results are compared with balance functions measured at the CERN Large Hadron Collider from Pb + Pb collisions at sNN=2.76TeV by the ALICE Collaboration. The width of the balance function decreases as the collisions become more central and as the beam energy is increased. In contrast, the widths of the balance functions calculated using shuffled events show little dependence on centrality or beam energy and are larger than the observed widths. Balance function widths calculated using events generated by UrQMD are wider than the measured widths in central collisions and show little centrality dependence. The measured widths of the balance functions in central collisions are consistent with the delayed hadronization of a deconfined quark gluon plasma (QGP). The narrowing of the balance function in central collisions at sNN=7.7 GeV implies that a QGP is still being created at this relatively low energy. © 2016 American Physical Society.942CNPq, Conselho Nacional de Desenvolvimento CientĂfico e TecnolĂłgicoMinistry of Education and Science of the Russian FederationMOE, Ministry of Education of the People's Republic of ChinaMOST, Ministry of Science and Technology of the People's Republic of ChinaNRF-2012004024, National Research FoundationNSF, National Stroke FoundationConselho Nacional de Desenvolvimento CientĂfico e TecnolĂłgico (CNPq
The present and future of QCD
This White Paper presents an overview of the current status and future perspective of QCD research, based on the community inputs and scientific conclusions from the 2022 Hot and Cold QCD Town Meeting. We present the progress made in the last decade toward a deep understanding of both the fundamental structure of the sub-atomic matter of nucleon and nucleus in cold QCD, and the hot QCD matter in heavy ion collisions. We identify key questions of QCD research and plausible paths to obtaining answers to those questions in the near future, hence defining priorities of our research over the coming decades
Salecker-Wigner inequalities and the black hole thermodynamics in doubly special relativity
Experimental and statistical studies of x-band transhorizon radio links over the sea
SIGLEAvailable from British Library Document Supply Centre- DSC:DX94770 / BLDSC - British Library Document Supply CentreGBUnited Kingdo
Transverse energy per charged particle in heavy-ion collisions: Role of collective flow
The ratio of (pseudo)rapidity density of transverse energy and the
(pseudo)rapidity density of charged particles, which is a measure of the mean
transverse energy per particle, is an important observable in high energy
heavy-ion collisions, which reveals about the mechanism of particle production
and the freeze-out criteria. Its collision energy and centrality dependence is
exactly like the chemical freeze-out temperature till top RHIC energy. The LHC
measurement at = 2.76 TeV brings up new challenges to rule out
the mechanisms of gluon saturation or non-equilibrium phenomena being prevalent
at high energies, which could contribute to the above observable. The
Statistical Hadron Gas Model (SHGM) with a static fireball approximation has
been successful in describing both the centrality and energy dependence till
top RHIC energies. However, the SHGM predictions for higher energies are highly
underestimated by the LHC data. In order to understand this, we have
incorporated radial flow effect in an excluded volume SHGM. The hard-core
radius of baryons at lower collision energies plays an important role in the
description of a hadronic system. In view of this, in order to make a complete
energy dependence study from FAIR to LHC energies, we have considered an
excluded volume SHGM. Our studies suggest that the collective flow plays an
important role in describing and it could be one of the possible
parameters to explain the jump observed in from RHIC to LHC
energies. Predictions for the LHC measurements at = 5.02 TeV
are given.Comment: Same as published version in EPJ