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https://hdl.handle.net/11147/8765
Title: | Evidence for collectivity in pp collisions at the LHC | Authors: | Khachatryan, V. Sirunyan, A. M. Tumasyan, A. Adam, W. Asilar, E. Bergauer, T. Karapınar, Güler CMS Collaboration |
Keywords: | CMS Physics Heavy ion Ridge Correlation pp |
Publisher: | Elsevier Ltd. | Abstract: | Measurements of two- and multi-particle angular correlations in pp collisions at root s = 5, 7, and 13TeV are presented as a function of charged-particle multiplicity. The data, corresponding to integrated luminosities of 1.0 pb(-1) (5 TeV), 6.2 pb(-1) (7 TeV), and 0.7 pb(-1) (13 TeV), were collected using the CMS detector at the LHC. The second-order (v(2)) and third-order (v(3)) azimuthal anisotropy harmonics of unidentified charged particles, as well as v(2) of K-S(0) and Lambda/(Lambda) over bar 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 v(2) values of charged hadrons (mostly pions), K-S(0), and Lambda/(Lambda) over bar, with lighter particle species exhibiting a stronger azimuthal anisotropy signal below pT approximate to GeV/c. For 13 TeV data, the v(2) 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. (C) 2016 The Author. Published by Elsevier B.V. This is an open access article under the CC BY license. | Description: | WOS: 000393627800025 | URI: | https://doi.org/10.1016/j.physletb.2016.12.009 https://hdl.handle.net/11147/8765 |
ISSN: | 0370-2693 |
Appears in Collections: | Rectorate / Rektörlük WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection |
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