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Evidence for collectivity in pp collisions at the LHC

Abstract: Measurements of two- and multi-particle angular correlations in pp collisions at s=5,7, and 13TeV are presented as a function of charged-particle multiplicity. The data, corresponding to integrated luminosities of 1.0pb?1 (5?TeV), 6.2pb?1 (7?TeV), and 0.7pb?1 (13?TeV), were collected using the CMS detector at the LHC. The second-order (v2) and third-order (v3) azimuthal anisotropy harmonics of unidentified charged particles, as well as v2 of KS 0 and ?/?? particles, are extracted from long-range two-particle correlations as functions of particle multiplicity and transverse momentum. For high-multiplicity pp events, a mass ordering is observed for the v2 values of charged hadrons (mostly pions), KS 0, and ?/??, with lighter particle species exhibiting a stronger azimuthal anisotropy signal below pT?2GeV/c. For 13?TeV data, the v2 signals are also extracted from four- and six-particle correlations for the first time in pp collisions, with comparable magnitude to those from two-particle correlations. These observations are similar to those seen in pPb and PbPb collisions, and support the interpretation of a collective origin for the observed long-range correlations in high-multiplicity pp collisions.

 Fuente: Physics Letters B 765 (2017) 193-220

 Editorial: Elsevier

 Fecha de publicación: 01/02/2017

 Nº de páginas: 28

 Tipo de publicación: Artículo de Revista

 DOI: 10.1016/j.physletb.2016.12.009

 ISSN: 0370-2693,1873-2445

 Url de la publicación: https://doi.org/10.1016/j.physletb.2016.12.009