Abstract
The two Zero Degree Calorimeters (ZDCs) of the CMS
experiment are located at ± 140 m from the collision point and
detect neutral particles in the |η| > 8.3 pseudorapidity
region. This paper ...presents a study on the performance of the ZDC in
the 2016 pPb run. The response of the detectors to ultrarelativistic
neutrons is studied using in-depth Monte Carlo simulations. A method
of signal extraction based on template fits is presented, along with
a dedicated calibration procedure. A deconvolution technique for the
correction of overlapping collision events is discussed.
The 2 + 1 SU(3) Polyakov linear sigma model is used to investigate the respective influence of a finite volume and a magnetic field on the quark-hadron phase boundary in the plane of baryon chemical ...potential ( B ) versus temperature (T) of the quantum chromodynamics (QCD) phase diagram. The calculated results indicate sizable shifts of the quark-hadron phase boundary to lower values of ( B and T ) for increasing magnetic field strength, and an opposite shift to higher values of ( B and T ) for decreasing system volume. Such shifts could have important implications for the extraction of the thermodynamic properties of the QCD phase diagram from heavy ion data.
The strongly interacting Quark-Gluon-Plasma (sQGP) created in relativistic nucleus-nucleus collisions, can be described by hydrodynamic models. Low energy hadrons are created after the so called ...freeze-out of this medium, thus their distributions reveal information about the final state of the sQGP, Photons are created throughout the evolution, so their distributions carry information on the whole expansion and cool down. We show results from an analytic, 1+3 dimensional perfect relativistic hydrodynamic solution, and compare hadron and photon observables to RHIC data. We extract an average equation of state of the expanding quark matter from this comparison. In the second part of this paper, we generalize the before mentioned analytic solution of relativistic perfect fluid hydrodynamics to arbitrary temperature-dependent Equation of State. We investigate special cases of this class of solutions, in particular, we present hydrodynamical solutions with an Equation of State determined from lattice QCD calculations.
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IZUM, KILJ, NUK, PILJ, PNG, SAZU, UL, UM, UPUK
In this paper we analyze a (1+3)-dimensional solution of relativistic hydrodynamics. We calculate momentum distribution and other observables from the solution and compare them to measurements from ...the Relativistic Heavy-Ion Collider (RHIC). We find that the solution we analyze is compatible with the data. In the last several years many numerical models were tested, but it is the first time that an exact, parametric, (1+3)-dimensional relativistic solution is compared to data.
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DOBA, EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, IZUM, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, SIK, UILJ, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
Buda-Lund hydro-model fits are compared to BRAHMS, PHENIX, PHOBOS and STAR data on identified particle spectra, two-particle Bose-Einstein or HBT correlations, charged particle pseudorapidity ...distributions and pseudorapidity as well as PT dependent elliptic flow in rootS(NN) = 130 and 200 GeV Au+Au collisions at RHIC. Preliminary results indicate that 7/8 of the particle emitting volume is rather cold, with surface temperature of 105 MeV, but the temperature has a distribution and the most central 1/8 of the volume is superheated to temperatures above the critical value, T(x) > T-c = 172 3 MeV.
Allowed regions of core fraction versus partial coherence are obtained from analysis of both two- and three-pion Bose-Einstein correlations measured at PHENIX in
s
N
N
=
200
GeV
Au+Au collisions. ...Two-pion Bose-Einstein correlation functions for different average transverse momenta are used to analyze chiral symmetry restoration.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UL, UM, UPCLJ, UPUK
The ellipsoidally symmetric extension of Buda–Lund hydrodynamic model is shown here to yield a natural description of the pseudorapidity dependence of the elliptic flow
v
2
(
η
)
, as determined ...recently by the PHOBOS experiment for Au + Au collisions at
s
N
N
=
130
and
200
GeV
. With the same set of parameters, the Buda–Lund model describes also the transverse momentum dependence of
v
2
of identified particles at mid-rapidity. The results confirm the indication for quark deconfinement in Au +Au collisions at RHIC, obtained from a successful Buda–Lund hydro model fit to the single particle spectra and two-particle correlation data, as measured by the BRAHMS, PHOBOS, PHENIX and STAR Collaborations.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UL, UM, UPCLJ, UPUK
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