Non-Gaussian elliptic-flow fluctuations in PbPb collisions at sNN=5.02TeV

The CMS Collaboration, cms-publication-committee-chair@cern.ch

doi:10.1016/j.physletb.2018.11.063

Non-Gaussian elliptic-flow fluctuations in PbPb collisions at s_NN=5.02TeV

The CMS Collaboration, [email protected]

Physics and Astronomy (Twin Cities)

Research output: Contribution to journal › Article › peer-review

46 Scopus citations

Abstract

Event-by-event fluctuations in the elliptic-flow coefficient v₂ are studied in PbPb collisions at s_NN=5.02 TeV using the CMS detector at the CERN LHC. Elliptic-flow probability distributions p(v₂) for charged particles with transverse momentum 0.3<p_T<3.0GeV/c and pseudorapidity |η|<1.0 are determined for different collision centrality classes. The moments of the p(v₂) distributions are used to calculate the v₂ coefficients based on cumulant orders 2, 4, 6, and 8. A rank ordering of the higher-order cumulant results and nonzero standardized skewness values obtained for the p(v₂) distributions indicate non-Gaussian initial-state fluctuations. Bessel–Gaussian and elliptic power fits to the flow distributions are studied to characterize the initial-state spatial anisotropy.

Original language	English (US)
Pages (from-to)	643-665
Number of pages	23
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	789
DOIs	https://doi.org/10.1016/j.physletb.2018.11.063
State	Published - Feb 10 2019

Bibliographical note

Publisher Copyright:
© 2018 The Author(s)

Keywords

Event-by-event elliptic flow
Non-Gaussian flow fluctuations
Unfolding

Publisher link

10.1016/j.physletb.2018.11.063

Find It

Find It at U of M Libraries

Cite this

@article{0efd6fe4c4904a3cbc411fc5850486c6,

title = "Non-Gaussian elliptic-flow fluctuations in PbPb collisions at sNN=5.02TeV",

abstract = "Event-by-event fluctuations in the elliptic-flow coefficient v2 are studied in PbPb collisions at sNN=5.02 TeV using the CMS detector at the CERN LHC. Elliptic-flow probability distributions p(v2) for charged particles with transverse momentum 0.3T<3.0GeV/c and pseudorapidity |η|<1.0 are determined for different collision centrality classes. The moments of the p(v2) distributions are used to calculate the v2 coefficients based on cumulant orders 2, 4, 6, and 8. A rank ordering of the higher-order cumulant results and nonzero standardized skewness values obtained for the p(v2) distributions indicate non-Gaussian initial-state fluctuations. Bessel–Gaussian and elliptic power fits to the flow distributions are studied to characterize the initial-state spatial anisotropy.",

keywords = "Event-by-event elliptic flow, Non-Gaussian flow fluctuations, Unfolding",

author = "{The CMS Collaboration, [email protected]} and Sirunyan, {A. M.} and A. Tumasyan and W. Adam and F. Ambrogi and E. Asilar and T. Bergauer and J. Brandstetter and E. Brondolin and M. Dragicevic and J. Er{\"o} and M. Flechl and M. Friedl and R. Fr{\"u}hwirth and Ghete, {V. M.} and J. Grossmann and J. Hrubec and M. Jeitler and A. K{\"o}nig and N. Krammer and I. Kr{\"a}tschmer and D. Liko and T. Madlener and I. Mikulec and E. Pree and N. Rad and H. Rohringer and J. Schieck and R. Sch{\"o}fbeck and M. Spanring and D. Spitzbart and W. Waltenberger and J. Wittmann and Wulz, {C. E.} and M. Zarucki and V. Chekhovsky and V. Mossolov and {Suarez Gonzalez}, J. and {De Wolf}, {E. A.} and {Di Croce}, D. and X. Janssen and J. Lauwers and {Van De Klundert}, M. and {Van Haevermaet}, H. and {Van Mechelen}, P. and {Van Remortel}, N. and M. Krohn and Chatterjee, {R. M.} and Y. Kubota and J. Mans and R. Rusack",

note = "Publisher Copyright: {\textcopyright} 2018 The Author(s)",

year = "2019",

month = feb,

day = "10",

doi = "10.1016/j.physletb.2018.11.063",

language = "English (US)",

volume = "789",

pages = "643--665",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

publisher = "Elsevier B.V.",

}

TY - JOUR

T1 - Non-Gaussian elliptic-flow fluctuations in PbPb collisions at sNN=5.02TeV

AU - The CMS Collaboration, [email protected]

AU - Sirunyan, A. M.

AU - Tumasyan, A.

AU - Adam, W.

AU - Ambrogi, F.

AU - Asilar, E.

AU - Bergauer, T.

AU - Brandstetter, J.

AU - Brondolin, E.

AU - Dragicevic, M.

AU - Erö, J.

AU - Flechl, M.

AU - Friedl, M.

AU - Frühwirth, R.

AU - Ghete, V. M.

AU - Grossmann, J.

AU - Hrubec, J.

AU - Jeitler, M.

AU - König, A.

AU - Krammer, N.

AU - Krätschmer, I.

AU - Liko, D.

AU - Madlener, T.

AU - Mikulec, I.

AU - Pree, E.

AU - Rad, N.

AU - Rohringer, H.

AU - Schieck, J.

AU - Schöfbeck, R.

AU - Spanring, M.

AU - Spitzbart, D.

AU - Waltenberger, W.

AU - Wittmann, J.

AU - Wulz, C. E.

AU - Zarucki, M.

AU - Chekhovsky, V.

AU - Mossolov, V.

AU - Suarez Gonzalez, J.

AU - De Wolf, E. A.

AU - Di Croce, D.

AU - Janssen, X.

AU - Lauwers, J.

AU - Van De Klundert, M.

AU - Van Haevermaet, H.

AU - Van Mechelen, P.

AU - Van Remortel, N.

AU - Krohn, M.

AU - Chatterjee, R. M.

AU - Kubota, Y.

AU - Mans, J.

AU - Rusack, R.

PY - 2019/2/10

Y1 - 2019/2/10

N2 - Event-by-event fluctuations in the elliptic-flow coefficient v2 are studied in PbPb collisions at sNN=5.02 TeV using the CMS detector at the CERN LHC. Elliptic-flow probability distributions p(v2) for charged particles with transverse momentum 0.3T<3.0GeV/c and pseudorapidity |η|<1.0 are determined for different collision centrality classes. The moments of the p(v2) distributions are used to calculate the v2 coefficients based on cumulant orders 2, 4, 6, and 8. A rank ordering of the higher-order cumulant results and nonzero standardized skewness values obtained for the p(v2) distributions indicate non-Gaussian initial-state fluctuations. Bessel–Gaussian and elliptic power fits to the flow distributions are studied to characterize the initial-state spatial anisotropy.

AB - Event-by-event fluctuations in the elliptic-flow coefficient v2 are studied in PbPb collisions at sNN=5.02 TeV using the CMS detector at the CERN LHC. Elliptic-flow probability distributions p(v2) for charged particles with transverse momentum 0.3T<3.0GeV/c and pseudorapidity |η|<1.0 are determined for different collision centrality classes. The moments of the p(v2) distributions are used to calculate the v2 coefficients based on cumulant orders 2, 4, 6, and 8. A rank ordering of the higher-order cumulant results and nonzero standardized skewness values obtained for the p(v2) distributions indicate non-Gaussian initial-state fluctuations. Bessel–Gaussian and elliptic power fits to the flow distributions are studied to characterize the initial-state spatial anisotropy.

KW - Event-by-event elliptic flow

KW - Non-Gaussian flow fluctuations

KW - Unfolding

UR - http://www.scopus.com/inward/record.url?scp=85060298610&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85060298610&partnerID=8YFLogxK

U2 - 10.1016/j.physletb.2018.11.063

DO - 10.1016/j.physletb.2018.11.063

M3 - Article

AN - SCOPUS:85060298610

SN - 0370-2693

VL - 789

SP - 643

EP - 665

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

ER -