期刊
JOURNAL OF HIGH ENERGY PHYSICS
卷 -, 期 2, 页码 -出版社
SPRINGER
DOI: 10.1007/JHEP02(2014)088
关键词
Relativistic heavy ion physics; Heavy Ions; harmonic flow
资金
- BMWF (Austria)
- FWF (Austria)
- FNRS (Belgium)
- FWO (Belgium)
- CNPq (Brazil)
- CAPES (Brazil)
- FAPERJ (Brazil)
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- MES (Bulgaria)
- CERN
- CAS (China)
- MoST (China)
- NSFC (China)
- COLCIENCIAS (Colombia)
- MSES (Croatia)
- RPF (Cyprus)
- MoER [SF0690030s09]
- ERDF (Estonia)
- Academy of Finland (Finland)
- MEC (Finland)
- HIP (Finland)
- CEA (France)
- CNRS/IN2P3 (France)
- BMBF (Germany)
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- HGF (Germany)
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- OTKA (Hungary)
- NKTH (Hungary)
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- Marie-Curie programme (European Union)
- European Research Council (European Union)
- EPLANET (European Union)
- Leventis Foundation
- A. P. Sloan Foundation
- Alexander von Humboldt Foundation
- Belgian Federal Science Policy Office
- Fonds pour la Formation a la Recherche dans l'Industrie et dans l'Agriculture (FRIA-Belgium)
- Agentschap voor Innovatie door Wetenschap en Technologie (IWT-Belgium)
- Ministry of Education, Youth and Sports (MEYS) of Czech Republic
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- Compagnia di San Paolo (Torino)
- HOMING PLUS programme of Foundation for Polish Science
- EU, Regional Development Fund
- Thalis and Aristeia programmes
- EU-ESF
- Greek NSRF
- STFC [ST/J004871/1, ST/J005665/1, ST/I505580/1, ST/I005912/1, ST/I000410/1, PP/E002803/1, ST/L005603/1, ST/H000925/1, ST/H000925/2, ST/F006748/1, ST/J005479/1, ST/I505572/1, ST/F007434/1, ST/K003844/1, ST/K001531/1, ST/K001604/1, ST/H00081X/2, ST/M002020/1, ST/K001639/1, ST/G502347/1, ST/L00609X/1, ST/F007094/1, ST/J004901/1, ST/K003542/1, ST/I000305/1, ST/I003622/1, ST/I002200/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/H000925/2, ST/J005479/1, ST/K001604/1, ST/F007094/1, ST/I003622/1 GRIDPP, ST/I003622/1, ST/I005912/1, ST/K003844/1 GRIDPP, ST/H000925/1, ST/F007434/1, ST/G502347/1, CMS, ST/F006748/1, ST/K001531/1, ST/K001639/1, ST/I002200/1, ST/M002020/1, ST/I505580/1, ST/I005912/1 GRIDPP, ST/K003844/1, ST/K003542/1, ST/L00609X/1 GRIDPP, ST/J004871/1, ST/K001256/1, ST/K003542/1 GRID PP, ST/J005665/1, ST/L00609X/1, ST/L005603/1, ST/J004901/1, ST/I000305/1, PP/E002803/1, ST/I505572/1, ST/I000410/1] Funding Source: researchfish
- Division Of Physics
- Direct For Mathematical & Physical Scien [1151640, 1067907, 1211067, 1120138, 0906479] Funding Source: National Science Foundation
- Division Of Physics
- Direct For Mathematical & Physical Scien [1205960, 1306951, 1314131] Funding Source: National Science Foundation
Azimuthal dihadron correlations of charged particles have been measured in PbPb collisions at = 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 mu b -aEuro parts per thousand 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 a parts per thousand yenaEuro parts per thousand 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.
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