Author: Antoni AduszkiewiczPublisher:
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Languages : en
Pages : 0
Book Description
Two-particle Correlations in Azimuthal Angle and Pseudorapidity in Central 7Be+9Be Collisions at the CERN Super Proton Synchrotron
Author: Antoni AduszkiewiczTwo-particle Correlations in Azimuthal Angle and Pseudorapidity in Inelastic P + P Interactions at the CERN Super Proton Synchrotron
Author: Publisher:
ISBN:
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Languages : en
Pages : 15
Book Description
Results on two-particle [Delta][eta][Delta][Phi] correlations in inelastic p + p interactions at 20, 31, 40, 80, and 158 GeV/c are presented. The measurements were performed using the large acceptance NA61/SHINE hadron spectrometer at the CERN Super Proton Synchrotron. The data show structures which can be attributed mainly to effects of resonance decays, momentum conservation, and quantum statistics. Furthermore, the results are compared with the Epos and UrQMD models.
Two-particle Correlations as a Function of Relative Azimuthal Angle and Pseudorapidity in Proton-proton Collisions Registered by the ALICE Experiment
Author: Małgorzata Anna JanikPseudorapidity Dependence of Long-range Two-particle Correlations in $p$Pb Collisions at $\sqrt{s_{NN}}
Author: Publisher:
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Languages : en
Pages :
Book Description
Two-particle correlations in pPb collisions at a nucleon-nucleon center-of-mass energy of 5.02 TeV are studied as a function of the pseudorapidity separation (Delta eta) of the particle pair at small relative azimuthal angle (abs(Delta phi)
Multiparticle Azimuthal Correlations in P -Pb and Pb-Pb Collisions at the CERN Large Hadron Collider
Author: Publisher:
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Languages : en
Pages :
Book Description
Our measurements of multiparticle azimuthal correlations (cumulants) for charged particles in p-Pb at √sNN=5.02 TeV and Pb-Pb at √sNN=2.76 TeV collisions are presented. They help address the question of whether there is evidence for global, flowlike, azimuthal correlations in the p-Pb system. These comparisons are made to measurements from the larger Pb-Pb system, where such evidence is established. In particular, the second harmonic two-particle cumulants are found to decrease with multiplicity, characteristic of a dominance of few-particle correlations in p-Pb collisions. However, when a.
Forward-central Two-particle Correlations in P-Pb Collisions at [mml
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 14
Book Description
Two-particle angular correlations between trigger particles in the forward pseudorapidity range (2.5>
Two-Particle Correlations at 40, 80, and 158 AGeV Pb-Au Collisions
Author: Publisher:
ISBN:
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Languages : en
Pages :
Book Description
In this thesis, a centrality dependent study of tow-particle momentum correlations of like-sign pions (HBT interferometry) from Pb-Au collisions at beam energies of 40, 80 and 158 AGeV is presented. The three-dimensional correlation function C_2, depending on the relative momentum components of the particle pair, was parameterized using a three-dimensional Gaussian, modified to consider the final state Coulomb repulsion. The parameterization was done in the Cartesian out-side-long system as proposed by G. Bertsch and S. Pratt. A differential analysis of the HBT radius parameters as a function of the mean transverse pair momentum k_perp allowed to determine transverse geometrical source sizes of about 5.5 fm to 7 fm, increasing with energy and centrality. The mean transverse flow velocity v_perp was found to be of the order 0.5--0.6 c. For the freeze-out time tau_f values between 6 and 8 fm/c were obtained with a duration of particle emission compatible with zero. The beam energy dependence of the HBT radii provide evidence for a universal pion freeze-out condition. The analyzed data have been recorded with the CERES spectrometer at the Super Proton Synchrotron (SPS) accelerator at CERN.
Two-proton Correlations in P+Pb and S+Pb Collisions at the Cern Super Proton Synchrotron
Author: Maxim PotekhinLong-range Two-particle Correlations of Strange Hadrons with Charged Particles in PPb and PbPb Collisions at LHC Energies
Author: Publisher:
ISBN:
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Languages : en
Pages : 25
Book Description
The measurements of two-particle angular correlations between an identified strange hadron ( K0s or [Lambda]/[Lambda]- ) and a charged particle, emitted in pPb collisions, are presented over a wide range in pseudorapidity and full azimuth. The data, corresponding to an integrated luminosity of approximately 35 nb-1, were collected at a nucleon-nucleon center-of-mass energy (√sNN ) of 5.02 TeV with the CMS detector at the LHC. Our results are compared to semi-peripheral PbPb collision data at √sNN , covering similar charged-particle multiplicities in the events. The observed azimuthal correlations at large relative pseudorapidity are used to extract the second-order (v2) and third-order (v3) anisotropy harmonics of K0s and [Lambda]/[Lambda]- particles. These quantities are studied as a function of the charged-particle multiplicity in the event and the transverse momentum of the particles. For high-multiplicity pPb events, a clear particle species dependence of v2 and v3 is observed. For pT
Systematic Azimuth Quadrupole and Minijet Trends from Two-particle Correlations in Heavy-ion Collisions
Author: David KettlerPublisher:
ISBN:
Category :
Languages : en
Pages : 284
Book Description
Heavy-ion collisions at the Relativistic Heavy Ion Collider (RHIC) produce a tremendous amount of data but new techniques are necessary for a comprehensive understanding of the physics behind these collisions. We present measurements from the STAR detector of both p[sub]t-integral and p[sub]t-differential azimuth two-particle correlations on azimuth (ø) and pseudorapidity (n) for unidentified hadrons in Au-Au collisions at [squareroot [super]sNN=62 and 200 GeV. The azimuth correlations can be fit to extract a quadrupole component---related to conventional v_2 measures---and a same-side peak. Both p[sub]t-integral and p[sub]t-differential results are presented as functions of Au-Au centrality.We observe simple universal energy and centrality trends for the p[sub]t-integral quadrupole component. p[sub]t-differential results can be transformed to reveal quadropole p[sub]t spectra that are nearly independent of centrality. A parametrization of the p[sub]t-differential quadrupole shows a simple p[sub]t dependence that can be factorized from the centrality and collision energy dependence above 0.75 GeV/c. Observed trends seem to be in conflict with standard hydrodynamic theories. Angular correlations contain jet-like structure wit most-probable hadron momentum ~1 GeV/c. For better comparison to RHIC data we analyze the energy scale dependence of fragmentation functions from e+-e− collisions on rapidity y. The results in a parameterization of fragmentation functions that enables extrapolation to low Q in order to describe fragment distributions at low transverse momentum p[sub]t in heavy ion collisions. We convert measured minimum-bias jet-like angular correlations to single-particle hadron yields and compare them with patron fragment yields inferred from spectrum hard components. We find that jet-like correlations in central 200 GeV Au-Au collisions correspond quantitatively to pQCD predictions, and the jet-correlated hadron yield comprises one third of the Au-Au final state in central collisions. These observations conflict with the claims of "jet quenching" at RHIC.