Evidence for collectivity in pp collisions at the LHC
- Title
- Evidence for collectivity in pp collisions at the LHC
- Author
- 김태정
- Keywords
- CMS; Physics; Heavy ion; Ridge; Correlation; pp
- Issue Date
- 2017-02
- Publisher
- ELSEVIER SCIENCE BV
- Citation
- PHYSICS LETTERS B, v. 765, page. 193-220
- 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.
- URI
- https://www.sciencedirect.com/science/article/pii/S037026931630747X?via%3Dihubhttps://repository.hanyang.ac.kr/handle/20.500.11754/112777
- ISSN
- 0370-2693; 1873-2445
- DOI
- 10.1016/j.physletb.2016.12.009
- Appears in Collections:
- COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > PHYSICS(물리학과) > Articles
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