Studies of azimuthal dihadron correlations in ultra-central PbPb collisions at sNN−−−√ =2.76 TeV
dc.contributor.author | Chatrchyan, S. | |
dc.contributor.author | Işıldak, Bora | |
dc.date.accessioned | 2014-11-10T07:37:27Z | |
dc.date.available | 2014-11-10T07:37:27Z | |
dc.date.issued | 2014-02 | |
dc.identifier.issn | 1029-8479 | |
dc.identifier.uri | http://link.springer.com/article/10.1007%2FJHEP02(2014)088 | |
dc.identifier.uri | http://hdl.handle.net/10679/522 | |
dc.description.abstract | Azimuthal dihadron correlations of charged particles have been measured in PbPb collisions at sNN−−−√ = 2.76TeV by the CMS collaboration, using data from the 2011 LHC heavy-ion run. The data set includes a sample of ultra-central (0-0.2% centrality) PbPb events collected using a trigger based on total transverse energy in the hadron forward calorimeters and the total multiplicity of pixel clusters in the silicon pixel tracker. A total of about 1.8 million ultra-central events were recorded, corresponding to an integrated luminosity of 120 μb − 1. The observed correlations in ultra-central PbPb events are expected to be particularly sensitive to initial-state fluctuations. The single-particle anisotropy Fourier harmonics, from v 2 to v 6, are extracted as a function of particle transverse momentum. At higher transverse momentum, the v 2 harmonic becomes significantly smaller than the higher-order v n (n ≥ 3). The p T-averaged v 2 and v 3 are found to be equal within 2%, while higher-order v n decrease as n increases. The breakdown of factorization of dihadron correlations into single-particle azimuthal anisotropies is observed. This effect is found to be most prominent in the ultra-central PbPb collisions, where the initial-state fluctuations play a dominant role. A comparison of the factorization data to hydrodynamic predictions with event-by-event fluctuating initial conditions is also presented. | en_US |
dc.description.sponsorship | SCOAP | |
dc.language.iso | eng | en_US |
dc.publisher | Springer Science+Business Media | en_US |
dc.relation.ispartof | Journal of High Energy Physics | |
dc.rights | openAccess | |
dc.title | Studies of azimuthal dihadron correlations in ultra-central PbPb collisions at sNN−−−√ =2.76 TeV | en_US |
dc.type | Article | en_US |
dc.description.version | publisher version | |
dc.peerreviewed | yes | en_US |
dc.publicationstatus | published | en_US |
dc.contributor.department | Özyeğin University | |
dc.contributor.authorID | (ORCID 0000-0002-0283-5234 & YÖK ID 124605) Işıldak, Bora | |
dc.contributor.ozuauthor | Işıldak, Bora | |
dc.creator | The CMS Collaboration | |
dc.identifier.volume | 2014 | |
dc.identifier.issue | 88 | |
dc.identifier.wos | WOS:000331974800001 | |
dc.identifier.doi | 10.1007/JHEP02(2014)088 | |
dc.subject.keywords | Relativistic heavy ion physics | en_US |
dc.subject.keywords | Heavy Ions | en_US |
dc.subject.keywords | Harmonic flow | en_US |
dc.identifier.scopus | SCOPUS:2-s2.0-84901649028 | |
dc.contributor.authorMale | 1 |
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