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Title

Evidence for collective multiparticle correlations in p-Pb collisions

AuthorsKhachatryan, V.; Brochero Cifuentes, J. A. ; Cabrillo, I. J. ; Calderon, Alicia ; Duarte Campderros, J. ; Fernández, M. ; Gómez, G. ; Graziano, A. ; López Virto, A. ; Marco, Jesús ; Marco, Rafael ; Martínez-Rivero, Celso ; Matorras, Francisco ; Muñoz Sánchez, F. J. ; Piedra, Jonatan ; Rodrigo, Teresa ; Rodríguez Marrero, Ana Y. ; Ruiz Jimeno, Alberto ; Scodellaro, Luca ; Vila, Iván ; Vilar, Rocío ; CMS Collaboration
Issue Date2015
PublisherAmerican Physical Society
CitationPhysical Review Letters 115(1): 012301 (2015)
AbstractThe second-order azimuthal anisotropy Fourier harmonics, v2, are obtained in p-Pb and PbPb collisions over a wide pseudorapidity (η) range based on correlations among six or more charged particles. The p-Pb data, corresponding to an integrated luminosity of 35nb-1, were collected during the 2013 LHC p-Pb run at a nucleon-nucleon center-of-mass energy of 5.02TeV by the CMS experiment. A sample of semiperipheral PbPb collision data at sNN=2.76TeV, corresponding to an integrated luminosity of 2.5μb-1 and covering a similar range of particle multiplicities as the p-Pb data, is also analyzed for comparison. The six- and eight-particle cumulant and the Lee-Yang zeros methods are used to extract the v2 coefficients, extending previous studies of two- and four-particle correlations. For both the p-Pb and PbPb systems, the v2 values obtained with correlations among more than four particles are consistent with previously published four-particle results. These data support the interpretation of a collective origin for the previously observed long-range (large Δη) correlations in both systems. The ratios of v2 values corresponding to correlations including different numbers of particles are compared to theoretical predictions that assume a hydrodynamic behavior of a p-Pb system dominated by fluctuations in the positions of participant nucleons. These results provide new insights into the multiparticle dynamics of collision systems with a very small overlapping region.
DescriptionThis article is available under the terms of the Creative Commons Attribution 3.0 License.-- et al.
Publisher version (URL)https://doi.org/10.1103/PhysRevLett.115.012301
URIhttp://hdl.handle.net/10261/139942
DOI10.1103/PhysRevLett.115.012301
Identifiersdoi: 10.1103/PhysRevLett.115.012301
e-issn: 1079-7114
issn: 0031-9007
Appears in Collections:(IFCA) Artículos
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