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Evidence for Collective Multiparticle Correlations in p-Pb Collisions

Abstract: The second-order azimuthal anisotropy Fourier harmonics, v2, are obtained in p-Pb and PbPb collisions over a wide pseudorapidity (?) range based on correlations among six or more charged particles. The p-Pb data, corresponding to an integrated luminosity of 35??nb-1, were collected during the 2013 LHC p-Pb run at a nucleon-nucleon center-of-mass energy of 5.02??TeV by the CMS experiment. A sample of semiperipheral PbPb collision data at vsNN=2.76??TeV, corresponding to an integrated luminosity of 2.5??µb-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 ??) 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.

 Fuente: Phys. Rev. Lett. Vol. 115, Num. 1, Pag. 012301 (2015)

 Editorial: American Physical Society

 Fecha de publicación: 01/07/2015

 Nº de páginas: 17

 Tipo de publicación: Artículo de Revista

 DOI: 10.1103/PhysRevLett.115.012301

 ISSN: 0031-9007,1079-7114

 Proyecto español: FPA2014-55295-C3-1-R ; FPA 2011-28694-C02-01

 Url de la publicación: https://doi.org/10.1103/PhysRevLett.115.012301

Autoría

KHACHATRYAN, VLADIMIR

JAVIER ANDRES BROCHERO CIFUENTES

MARCOS FERNANDEZ GARCIA

ALBERTO GRAZIANO

MARIA AMPARO LOPEZ VIRTO

RAFAEL JOSE MARCO DE LUCAS

FRANCISCA JAVIELA MUÑOZ SANCHEZ

ANA YAIZA RODRIGUEZ MARRERO