Principal-component analysis of two-particle azimuthal correlations in PbPb and pPb collisions at CMS

For the first time a principle-component analysis is used to separate out different orthogonal modes of the two-particle correlation matrix from heavy ion collisions. The analysis uses data from √sNN = 2.76 TeV PbPb and √sNN = 5.02 TeV pPb collisions collected by the CMS experiment at the CERN Lar...

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Main Authors:	Sirunyan, A. M., Tumasyan, A. R., Adam, Wolfgang, Ambrogi, F., Asilar, Ece, Md. Ali, Mohd. Adli, Zolkapli, Z., Wan Abdullah, Wan Ahmad Tajuddin, ., et. al
Format:	Article
Language:	English English
Published:	American Physical Society 2017
Subjects:	QC Physics
Online Access:	http://irep.iium.edu.my/61897/ http://irep.iium.edu.my/61897/ http://irep.iium.edu.my/61897/ http://irep.iium.edu.my/61897/1/61897_Principal-component%20analysis%20of%20two-particle.pdf http://irep.iium.edu.my/61897/2/61897_Principal-component%20analysis%20of%20two-particle_SCOPUS.pdf

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recordtype	eprints
spelling	iium-618972018-07-10T00:44:58Z http://irep.iium.edu.my/61897/ Principal-component analysis of two-particle azimuthal correlations in PbPb and pPb collisions at CMS Sirunyan, A. M. Tumasyan, A. R. Adam, Wolfgang Ambrogi, F. Asilar, Ece Md. Ali, Mohd. Adli Zolkapli, Z. Wan Abdullah, Wan Ahmad Tajuddin ., et. al QC Physics For the first time a principle-component analysis is used to separate out different orthogonal modes of the two-particle correlation matrix from heavy ion collisions. The analysis uses data from √sNN = 2.76 TeV PbPb and √sNN = 5.02 TeV pPb collisions collected by the CMS experiment at the CERN Large Hadron Collider. Two-particle azimuthal correlations have been extensively used to study hydrodynamic flow in heavy ion collisions. Recently it was shown that the expected factorization of two-particle results into a product of the constituent single-particle anisotropies is broken. The new information provided by these modes may shed light on the breakdown of flow factorization in heavy ion collisions. The first two modes (“leading” and “subleading”) of two-particle correlations are presented for elliptical and triangular anisotropies in PbPb and pPb collisions as a function of pT over a wide range of event activity. The leading mode is found to be essentially equivalent to the anisotropy harmonic previously extracted from two-particle correlation methods. The subleading mode represents a new experimental observable and is shown to account for a large fraction of the factorization breaking recently observed at high transverse momentum. The principle-component analysis technique was also applied to multiplicity fluctuations. These also show a subleading mode. The connection of these new results to previous studies of factorization is discussed American Physical Society 2017-12-05 Article PeerReviewed application/pdf en http://irep.iium.edu.my/61897/1/61897_Principal-component%20analysis%20of%20two-particle.pdf application/pdf en http://irep.iium.edu.my/61897/2/61897_Principal-component%20analysis%20of%20two-particle_SCOPUS.pdf Sirunyan, A. M. and Tumasyan, A. R. and Adam, Wolfgang and Ambrogi, F. and Asilar, Ece and Md. Ali, Mohd. Adli and Zolkapli, Z. and Wan Abdullah, Wan Ahmad Tajuddin and ., et. al (2017) Principal-component analysis of two-particle azimuthal correlations in PbPb and pPb collisions at CMS. Physical Review C, 96 (6). 064902-1. ISSN 2469-9985 https://journals.aps.org/prc/abstract/10.1103/PhysRevC.96.064902 10.1103/PhysRevC.96.064902
repository_type	Digital Repository
institution_category	Local University
institution	International Islamic University Malaysia
building	IIUM Repository
collection	Online Access
language	English English
topic	QC Physics
spellingShingle	QC Physics Sirunyan, A. M. Tumasyan, A. R. Adam, Wolfgang Ambrogi, F. Asilar, Ece Md. Ali, Mohd. Adli Zolkapli, Z. Wan Abdullah, Wan Ahmad Tajuddin ., et. al Principal-component analysis of two-particle azimuthal correlations in PbPb and pPb collisions at CMS
description	For the first time a principle-component analysis is used to separate out different orthogonal modes of the two-particle correlation matrix from heavy ion collisions. The analysis uses data from √sNN = 2.76 TeV PbPb and √sNN = 5.02 TeV pPb collisions collected by the CMS experiment at the CERN Large Hadron Collider. Two-particle azimuthal correlations have been extensively used to study hydrodynamic flow in heavy ion collisions. Recently it was shown that the expected factorization of two-particle results into a product of the constituent single-particle anisotropies is broken. The new information provided by these modes may shed light on the breakdown of flow factorization in heavy ion collisions. The first two modes (“leading” and “subleading”) of two-particle correlations are presented for elliptical and triangular anisotropies in PbPb and pPb collisions as a function of pT over a wide range of event activity. The leading mode is found to be essentially equivalent to the anisotropy harmonic previously extracted from two-particle correlation methods. The subleading mode represents a new experimental observable and is shown to account for a large fraction of the factorization breaking recently observed at high transverse momentum. The principle-component analysis technique was also applied to multiplicity fluctuations. These also show a subleading mode. The connection of these new results to previous studies of factorization is discussed
format	Article
author	Sirunyan, A. M. Tumasyan, A. R. Adam, Wolfgang Ambrogi, F. Asilar, Ece Md. Ali, Mohd. Adli Zolkapli, Z. Wan Abdullah, Wan Ahmad Tajuddin ., et. al
author_facet	Sirunyan, A. M. Tumasyan, A. R. Adam, Wolfgang Ambrogi, F. Asilar, Ece Md. Ali, Mohd. Adli Zolkapli, Z. Wan Abdullah, Wan Ahmad Tajuddin ., et. al
author_sort	Sirunyan, A. M.
title	Principal-component analysis of two-particle azimuthal correlations in PbPb and pPb collisions at CMS
title_short	Principal-component analysis of two-particle azimuthal correlations in PbPb and pPb collisions at CMS
title_full	Principal-component analysis of two-particle azimuthal correlations in PbPb and pPb collisions at CMS
title_fullStr	Principal-component analysis of two-particle azimuthal correlations in PbPb and pPb collisions at CMS
title_full_unstemmed	Principal-component analysis of two-particle azimuthal correlations in PbPb and pPb collisions at CMS
title_sort	principal-component analysis of two-particle azimuthal correlations in pbpb and ppb collisions at cms
publisher	American Physical Society
publishDate	2017
url	http://irep.iium.edu.my/61897/ http://irep.iium.edu.my/61897/ http://irep.iium.edu.my/61897/ http://irep.iium.edu.my/61897/1/61897_Principal-component%20analysis%20of%20two-particle.pdf http://irep.iium.edu.my/61897/2/61897_Principal-component%20analysis%20of%20two-particle_SCOPUS.pdf
first_indexed	2023-09-18T21:27:49Z
last_indexed	2023-09-18T21:27:49Z
_version_	1777412309370535936

Principal-component analysis of two-particle azimuthal correlations in PbPb and pPb collisions at CMS

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