Multiplicity and transverse momentum dependence of two- and four-particle correlations in pPb and PbPb collisions
Contribuinte(s) |
Universidade Estadual Paulista (UNESP) |
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Data(s) |
27/05/2014
27/05/2014
23/07/2013
|
Resumo |
Measurements of two- and four-particle angular correlations for charged particles emitted in pPb collisions are presented over a wide range in pseudorapidity and full azimuth. The data, corresponding to an integrated luminosity of approximately 31nb-1, were collected during the 2013 LHC pPb run at a nucleon-nucleon center-of-mass energy of 5.02 TeV by the CMS experiment. The results are compared to 2.76 TeV semi-peripheral PbPb collision data, collected during the 2011 PbPb run, covering a similar range of particle multiplicities. The observed correlations are characterized by the near-side (|δφ|≈0) associated pair yields and the azimuthal anisotropy Fourier harmonics (vn). The second-order (v2) and third-order (v3) anisotropy harmonics are extracted using the two-particle azimuthal correlation technique. A four-particle correlation method is also applied to obtain the value of v2 and further explore the multi-particle nature of the correlations. Both associated pair yields and anisotropy harmonics are studied as a function of particle multiplicity and transverse momentum. The associated pair yields, the four-particle v2, and the v3 become apparent at about the same multiplicity. A remarkable similarity in the v3 signal as a function of multiplicity is observed between the pPb and PbPb systems. Predictions based on the color glass condensate and hydrodynamic models are compared to the experimental results. © 2013 CERN. |
Formato |
213-240 |
Identificador |
http://dx.doi.org/10.1016/j.physletb.2013.06.028 Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, v. 724, n. 4-5, p. 213-240, 2013. 0370-2693 http://hdl.handle.net/11449/76025 10.1016/j.physletb.2013.06.028 WOS:000322358500005 2-s2.0-84880266581 2-s2.0-84880266581.pdf |
Idioma(s) |
eng |
Relação |
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics |
Direitos |
openAccess |
Palavras-Chave | #CMS #Heavy ions #Physics |
Tipo |
info:eu-repo/semantics/article |