Two-particle Azimuthal Correlation in D+Au and P+p Collisions At?sNN
Author: F. Benedosso
Publisher:
Published: 2008
Total Pages:
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Author: F. Benedosso
Publisher:
Published: 2008
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Publisher:
Published: 2016
Total Pages: 6
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DOWNLOAD EBOOKPHENIX has measured the transverse momentum (pT) spectra and two particle angular correlations for high pT particles in d+Au collisions at psNN=200 GeV using the RHIC Year-2008 run data. The azimuthal angle correlations for two particles with a large rapidity gap exhibit a ridge-like structure. Using the pi-0s reconstructed in the EMCal, we have successfully extended the pT reach of the correlation up to 8 GeV/c. We find that the azimuthal anisotropy of hadrons found at low pT persists up to 6 GeV/c with a significant centrality and pT dependence, similar to what was observed in A+A collisions.
Author: Shreyasi Acharya
Publisher:
Published: 2020
Total Pages: 0
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DOWNLOAD EBOOKAuthor: Thongbay Vongpaseuth
Publisher:
Published: 1999
Total Pages: 392
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DOWNLOAD EBOOKAuthor: Dariusz Antończyk
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Published: 2006
Total Pages: 171
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DOWNLOAD EBOOKAuthor: Matthew Nguyen
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Published: 2009
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DOWNLOAD EBOOKAuthor: Aya Ishihara
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Published: 2004
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DOWNLOAD EBOOKAuthor: Heinz Tilsner
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Published: 2002
Total Pages: 119
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DOWNLOAD EBOOKAuthor: Burak Han Alver
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Published: 2010
Total Pages: 108
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DOWNLOAD EBOOKMeasurements of collective flow and two-particle correlations have proven to be effective tools for understanding the properties of the system produced in ultrarelativistic nucleus-nucleus collisions at the Relativistic Heavy Ion Collider (RHIC). Accurate modeling of the initial conditions of a heavy ion collision is crucial in the interpretation of these results. The anisotropic shape of the initial geometry of heavy ion collisions with finite impact parameter leads to an anisotropic particle production in the azimuthal direction through collective flow of the produced medium. In "head-on" collisions of Copper nuclei at ultrarelativistic energies, the magnitude of this "elliptic flow" has been observed to be significantly large. This is understood to be due to fluctuations in the initial geometry which leads to a significant anisotropy even for most central Cu+Cu collisions. This thesis presents a phenomenological study of the effect of initial geometry fluctuations on two-particle correlations and an experimental measurement of the magnitude of elliptic flow fluctuations which is predicted to be large if initial geometry fluctuations are present. Two-particle correlation measurements in Au+Au collisions at the top RHIC energies have shown that after correction for contributions from elliptic flow, strong azimuthal correlation signals are present at A0 = 0 and A0 ~ 120. These correlation structures may be understood in terms of event-by-event fluctuations which result in a triangular anisotropy in the initial collision geometry of heavy ion collisions, which in turn leads to a triangular anisotropy in particle production. It is observed that similar correlation structures are observed in A Multi-Phase Transport (AMPT) model and are, indeed, found to be driven by the triangular anisotropy in the initial collision geometry. Therefore "triangular flow" may be the appropriate description of these correlation structures in data. The measurement of elliptic flow fluctuations is complicated by the contributions of statistical fluctuations and other two-particle correlations (non-flow correlations) to the observed fluctuations in azimuthal particle anisotropy. New experimental techniques, which crucially rely on the uniquely large coverage of the PHOBOS detector at RHIC, are developed to quantify and correct for these contributions. Relative elliptic flow fluctuations of approximately 30-40% are observed in 6-45% most central Au+Au collisions at s NN= 200 GeV. These results are consistent with the predicted initial geometry fluctuations.
Author: Brooke Haag
Publisher:
Published: 2009
Total Pages: 330
ISBN-13:
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