Download or read book Centrality Dependence of Identified Particle Elliptic Flow in Relativistic Heavy Ion Collisions at math mrow msqrt msub mi mi mrow mi N mi mi N mi mrow msub msqrt mo written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Here, elliptic flow (v2) values for identified particles at midrapidity in Au + Au collisions measured by the STAR experiment in the Beam Energy Scan at the Relativistic Heavy Ion Collider at √sNN = 7.7-62.4 GeV are presented for three centrality classes. The centrality dependence and the data at √sNN = 14.5 GeV are new. Except at the lowest beam energies, we observe a similar relative v2 baryon-meson splitting for all centrality classes which is in agreement within 15% with the number-of-constituent quark scaling. The larger v2 for most particles relative to antiparticles, already observed for minimum bias collisions, shows a clear centrality dependence, with the largest difference for the most central collisions. Also, the results are compared with a multiphase transport (AMPT) model and fit with a blast wave model.

Download or read book Centrality Rapidity and Transverse Momentum Dependence of Isolated Prompt Photon Production in Lead lead Collisions at math mrow msqrt msub mi mi mrow mi N mi mi N mi mrow msub msqrt mo written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In this study, prompt photon production in √sNN = 2.76-TeV Pb+Pb collisions has been measured by the ATLAS experiment at the Large Hadron Collider using data collected in 2011 with an integrated luminosity of 0.14 nb-1. Inclusive photon yields, scaled by the mean nuclear thickness function, are presented as a function of collision centrality and transverse momentum in two pseudorapidity intervals,

Download or read book Onset of Radial Flow in math mrow mi p mi mo mo mi p mi mrow math Collisions written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: It has been debated for decades whether hadrons emerging from p+p collisions exhibit collective expansion. The signal of the collective motion in p+p collisions is not as clear as in heavy-ion collisions because of the low multiplicity and large fluctuation in p+p collisions. Tsallis Blast-Wave (TBW) model is a thermodynamic approach, introduced to handle the overwhelming correlation and fluctuation in the hadronic processes. We have systematically studied the identified particle spectra in p+p collisions from RHIC to LHC using TBW and found no appreciable radial flow in p+p collisions below √s = 900 GeV. At LHC higher energy of 7 TeV in p+p collisions, the radial flow velocity achieves an average of ([beta]) = 0.320 ± 0.005. This flow velocity is comparable to that in peripheral (40-60%) Au+Au collisions at RHIC. In addition, breaking of the identified particle spectra mT scaling was also observed at LHC from a model independent test.

Download or read book Centrality Dependence of Two particle Correlations in Relativistic Heavy Ion Collisions written by Youngsoo Park and published by . This book was released on 2009 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt: Results on the centrality dependence of two-particle correlations in Au+Au collisions at ... 200GeV are presented. A particular focus is devoted to investigating any anomalous behavior in the centrality dependence of correlation functions, as previous results suggest existence of such tendencies around Npart [approx.] 50. Correlation functions are calculated for a wide kinematic region of ... from data obtained by the PHOBOS experiment at RHIC. The RHIC layout and the PHOBOS detector setup is discussed. Data acquisition method employed by the PHOBOS experiment, data processing procedures and event selection criteria are presented. The two-particle correlation function is defined and calculation procedures are described. Decomposition analysis is explained as the fit function and the constituting components are introduced. Analysis results for correlation functions and fits are presented. The results suggest that in the kinematic region covered by the analysis of this thesis, no anomalous trends in component behavior exists.