Evidence for collectivity in pp collisions at the LHC
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Published version
Author(s)
Type
Journal Article
Abstract
Measurements of two- and multi-particle angular correlations in pp collisions at View the MathML sources=5,7, and 13TeV are presented as a function of charged-particle multiplicity. The data, corresponding to integrated luminosities of View the MathML source1.0pb−1 (5 TeV), View the MathML source6.2pb−1 (7 TeV), and View the MathML source0.7pb−1 (13 TeV), were collected using the CMS detector at the LHC. The second-order (v2v2) and third-order (v3v3) azimuthal anisotropy harmonics of unidentified charged particles, as well as v2v2 of View the MathML sourceKS0 and View the MathML sourceΛ/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 v2v2 values of charged hadrons (mostly pions), View the MathML sourceKS0, and View the MathML sourceΛ/Λ‾, with lighter particle species exhibiting a stronger azimuthal anisotropy signal below View the MathML sourcepT≈2GeV/c. For 13 TeV data, the v2v2 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.
Date Issued
2016-12-13
Date Acceptance
2016-12-05
Citation
Physics Letters B, 2016, 765, pp.193-220
ISSN
0370-2693
Publisher
Elsevier
Start Page
193
End Page
220
Journal / Book Title
Physics Letters B
Volume
765
Copyright Statement
© 2016
The
Author(s).
Published
by
Elsevier
B.V.
This
is
an
open
access
article
under
the
CC
BY
license
(http://creativecommons.org/licenses/by/4.0/
).
The
Author(s).
Published
by
Elsevier
B.V.
This
is
an
open
access
article
under
the
CC
BY
license
(http://creativecommons.org/licenses/by/4.0/
).
Identifier
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000393627800025&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
Subjects
Science & Technology
Physical Sciences
Astronomy & Astrophysics
Physics, Nuclear
Physics, Particles & Fields
Physics
CMS
Heavy ion
Ridge
Correlation
pp
TRANSVERSE-MOMENTUM DEPENDENCE
PROTON-PROTON
FLOW
PSEUDORAPIDITY
MULTIPLICITY
TEV
Nuclear & Particles Physics
0202 Atomic, Molecular, Nuclear, Particle And Plasma Physics
Publication Status
Published