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Studies of azimuthal dihadron correlations in ultra-central PbPb collisions at sNN−−−−√ =2.76 TeV
dc.contributor.author | CMS Collaboration | |
dc.contributor.author | Bean, Alice | |
dc.date.accessioned | 2015-12-21T18:59:54Z | |
dc.date.available | 2015-12-21T18:59:54Z | |
dc.date.issued | 2014-02 | |
dc.identifier.citation | CMS Collaboration. "Studies of azimuthal dihadron correlations in ultra-central PbPb collisions at sNN−−−−√ =2.76 TeV." Journal of High Energy Physics. February, 2014: v5 n2. http://dx.doi.org/10.1007/JHEP02(2014)088 | en_US |
dc.identifier.uri | http://hdl.handle.net/1808/19312 | |
dc.description | This is the published version. | en_US |
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.publisher | Springer Verlag | en_US |
dc.subject | Relativistic heavy ion physics | en_US |
dc.subject | Heavy Ions | en_US |
dc.subject | Harmonic flow | en_US |
dc.title | Studies of azimuthal dihadron correlations in ultra-central PbPb collisions at sNN−−−−√ =2.76 TeV | en_US |
dc.type | Article | |
kusw.kuauthor | Bean, Alice | |
kusw.kudepartment | Physics and Astronomy | en_US |
dc.identifier.doi | 10.1007/JHEP02(2014)088 | |
kusw.oaversion | Scholarly/refereed, publisher version | |
kusw.oapolicy | This item meets KU Open Access policy criteria. | |
dc.rights.accessrights | openAccess |