Martinez Ruiz del Arbol, Pablo
Meinhard, Maren T.
Tavolaro, Vittorio R.
- Journal Article
Rights / licenseCreative Commons Attribution 4.0 International
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 Λ/Λ‾ 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 Λ/Λ‾, 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 Show more
Journal / seriesPhysics Letters B
Pages / Article No.
SubjectCMS; Physics; Heavy ion; Ridge; Correlation; Pp
Organisational unit03381 - Pauss, Felicitas (emeritus)
03593 - Dissertori, Günther
03904 - Wallny, Rainer
08803 - Grab, Christoph (Tit.Prof.)
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