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

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F17%3A10368007" target="_blank" >RIV/00216208:11320/17:10368007 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1103/PhysRevC.96.064902" target="_blank" >http://dx.doi.org/10.1103/PhysRevC.96.064902</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevC.96.064902" target="_blank" >10.1103/PhysRevC.96.064902</a>

Result language

angličtina

Original language name

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

Original language 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 root s(NN) = 2.76 TeV PbPb and root s(NN) = 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 (&quot;leading&quot; and &quot;subleading&quot;) of two-particle correlations are presented for elliptical and triangular anisotropies in PbPb and pPb collisions as a function of p(T) 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.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10304 - Nuclear physics

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2017

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Physical Review C

ISSN

2469-9985

e-ISSN

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Volume of the periodical

96

Issue of the periodical within the volume

6

Country of publishing house

US - UNITED STATES

Number of pages

21

Pages from-to

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UT code for WoS article

000417077300003

EID of the result in the Scopus database

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