56 research outputs found
Observables and initial conditions for rotating and expanding fireballs with spheroidal symmetry
Utilizing a recently found class of exact, analytic rotating solutions of
non-relativistic fireball hydrodynamics, we calculate analytically the
single-particle spectra, the elliptic flows and two-particle Bose-Einstein
correlation functions for rotating and expanding fireballs with spheroidal
symmetry. We demonstrate, that rotation generates final state momentum
anisotropies even for a spatially symmetric, spherical initial geometry of the
fireball. The mass dependence of the effective temperatures, as well as the HBT
radius parameters and the elliptic flow are shown to be sensitive not only to
radial flow effects but also to the magnitude of the initial angular momentum.Comment: 26 pages, with 18 .eps figures. Dedicated to L. P. Csernai on the
occasion of his 65th birthday. Invited talk of T. Cs\"org\H{o} at the
International Workshop on Collectivity in Relativistic Heavy Ion Collisions,
Kolymbari, Crete,Greece, 14-20 September 2014, I.F. Barna at WPCF 2014,
Gy\"ongy\"os, Hungary, 25-29 August 2014, and M. I. Nagy at WPCF 2015,
Warsaw, Poland, 3-7 November 201
Higher Order Bose-Einstein Correlations for Systems with Large Halo
A generalization of the core/halo model to the Bose-Einstein correlation
function of any number of particles is presented. In particular, a simple
prediction is obtained for the intercept parameter of the n-particle inclusive
Bose-Einstein correlation functions for arbitrary large values of n.Comment: 10 pages, LaTeX, no figures (Shortened version
Oscillating HBT radii and the time evolution of the source-√s NN = 200 GeV Au + Au data analyzed with azimuthally sensitive Buda-Lund hydro model
Identified particle spectra of pions, kaons and (anti)protons, and elliptic flow and azimuthal dependence of Bose-Einstein or HBT correlations of identified pions in sNN = 200 GeV Au + Au collisions is analyzed simultaneously using an ellipsoidally symmetric generalization of the Buda-Lund hydrodynamical model. The transverse flow is found to be faster in the reaction plane than out of plane, which results in a reaction zone that gets slightly more elongated in-plane than out of plane. © 2011 Pleiades Publishing, Ltd
Anomalous radial expansion in central heavy-ion reactions
The expansion velocity profile in central heavy-ion reactions in the Fermi
energy domain is examined. The radial expansion is non-hubblean and in the
surface region it scales proportional to a higher exponent () of
the radius. The anomalous expansion velocity profile is accompanied by a power
law nucleon density profile in the surface region. Both these features of
central heavy-ion reactions disappear at higher energies, and the system
follows a uniform Hubble expansion ()
Simple predictions from ALCOR_c for rehadronisation of charmed quark matter
We study the production of charmed hadrons with the help of ALCOR_c, the
algebraic coalescence model for rehadronisation of charmed quark matter.
Mesonic ratios are introduced as factors connecting various antibaryon to
baryon ratios. The resulting simple relations could serve as tests of quark
matter formation and coalescence type rehadronization in heavy ion collisions.Comment: 7 pages in Latex, 1 PS figur
Multifragmentation of non-spherical nuclei
The shape influence of decaying thermalized source on various characteristics
of multifragmentation as well as its interplay with effects of angular momentum
and collective expansion are first studied and the most pertinent variables are
proposed. The analysis is based on the extension of the statistical
microcanonical multifragmentation model.Comment: 5 pages, 4 figure
Finite coherent length and multi-pion correlation effects on two-pion interferometry
The effects of multi-pion correlations and finite coherent length on two-pion
interferometry are studied. It was shown that as the pion multiplicity and
coherent length become larger, the apparent radius and the apparent coherent
parameters derived from two-pion interferometry become smaller. The influence
of the coherent length on the effective temperature is discussed.Comment: 5 pages, two figure
Recommended from our members
Multiparticle azimuthal correlations for extracting event-by-event elliptic and triangular flow in Au + Au collisions at sNN =200 GeV
We present measurements of elliptic and triangular azimuthal anisotropy of charged particles detected at forward rapidity 1<|η|<3 in Au + Au collisions at sNN=200 GeV, as a function of centrality. The multiparticle cumulant technique is used to obtain the elliptic flow coefficients v2{2},v2{4},v2{6}, and v2{8}, and triangular flow coefficients v3{2} and v3{4}. Using the small-variance limit, we estimate the mean and variance of the event-by-event v2 distribution from v2{2} and v2{4}. In a complementary analysis, we also use a folding procedure to study the distributions of v2 and v3 directly, extracting both the mean and variance. Implications for initial geometrical fluctuations and their translation into the final-state momentum distributions are discussed
Evidence for non-exponential elastic proton-proton differential cross-section at low |t| and sqrt(s) = 8 TeV by TOTEM
The TOTEM experiment has made a precise measurement of the elastic
proton-proton differential cross-section at the centre-of-mass energy sqrt(s) =
8 TeV based on a high-statistics data sample obtained with the beta* = 90
optics. Both the statistical and systematic uncertainties remain below 1%,
except for the t-independent contribution from the overall normalisation. This
unprecedented precision allows to exclude a purely exponential differential
cross-section in the range of four-momentum transfer squared 0.027 < |t| < 0.2
GeV^2 with a significance greater than 7 sigma. Two extended parametrisations,
with quadratic and cubic polynomials in the exponent, are shown to be well
compatible with the data. Using them for the differential cross-section
extrapolation to t = 0, and further applying the optical theorem, yields total
cross-section estimates of (101.5 +- 2.1) mb and (101.9 +- 2.1) mb,
respectively, in agreement with previous TOTEM measurements.Comment: Final version published in Nuclear Physics
- …