Measurement of flow harmonics with multi-particle cumulants in Pb+Pb collisions at (Formula presented.) TeV with the ATLAS detector

The ATLAS Collaboration

    Research output: Contribution to journalArticle

    46 Citations (Scopus)

    Abstract

    ATLAS measurements of the azimuthal anisotropy in lead–lead collisions at (Formula presented.) are shown using a dataset of approximately 7 (Formula presented.) collected at the LHC in 2010. The measurements are performed for charged particles with transverse momenta (Formula presented.) and in the pseudorapidity range (Formula presented.) The anisotropy is characterized by the Fourier coefficients, (Formula presented.), of the charged-particle azimuthal angle distribution for (Formula presented.). The Fourier coefficients are evaluated using multi-particle cumulants calculated with the generating function method. Results on the transverse momentum, pseudorapidity and centrality dependence of the (Formula presented.) coefficients are presented. The elliptic flow, (Formula presented.), is obtained from the two-, four-, six- and eight-particle cumulants while higher-order coefficients, (Formula presented.), are determined with two- and four-particle cumulants. Flow harmonics (Formula presented.) measured with four-particle cumulants are significantly reduced compared to the measurement involving two-particle cumulants. A comparison to (Formula presented.) measurements obtained using different analysis methods and previously reported by the LHC experiments is also shown. Results of measurements of flow fluctuations evaluated with multi-particle cumulants are shown as a function of transverse momentum and the collision centrality. Models of the initial spatial geometry and its fluctuations fail to describe the flow fluctuations measurements.

    Original languageEnglish
    Article number3157
    Pages (from-to)1-28
    Number of pages28
    JournalEuropean Physical Journal C
    Volume74
    Issue number11
    DOIs
    Publication statusPublished - 2014 Nov 1

    Fingerprint

    Detectors
    harmonics
    collisions
    detectors
    Momentum
    Charged particles
    Anisotropy
    transverse momentum
    coefficients
    charged particles
    anisotropy
    Geometry
    Experiments
    geometry

    ASJC Scopus subject areas

    • Physics and Astronomy (miscellaneous)
    • Engineering (miscellaneous)

    Cite this

    Measurement of flow harmonics with multi-particle cumulants in Pb+Pb collisions at (Formula presented.) TeV with the ATLAS detector. / The ATLAS Collaboration.

    In: European Physical Journal C, Vol. 74, No. 11, 3157, 01.11.2014, p. 1-28.

    Research output: Contribution to journalArticle

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    title = "Measurement of flow harmonics with multi-particle cumulants in Pb+Pb collisions at (Formula presented.) TeV with the ATLAS detector",
    abstract = "ATLAS measurements of the azimuthal anisotropy in lead–lead collisions at (Formula presented.) are shown using a dataset of approximately 7 (Formula presented.) collected at the LHC in 2010. The measurements are performed for charged particles with transverse momenta (Formula presented.) and in the pseudorapidity range (Formula presented.) The anisotropy is characterized by the Fourier coefficients, (Formula presented.), of the charged-particle azimuthal angle distribution for (Formula presented.). The Fourier coefficients are evaluated using multi-particle cumulants calculated with the generating function method. Results on the transverse momentum, pseudorapidity and centrality dependence of the (Formula presented.) coefficients are presented. The elliptic flow, (Formula presented.), is obtained from the two-, four-, six- and eight-particle cumulants while higher-order coefficients, (Formula presented.), are determined with two- and four-particle cumulants. Flow harmonics (Formula presented.) measured with four-particle cumulants are significantly reduced compared to the measurement involving two-particle cumulants. A comparison to (Formula presented.) measurements obtained using different analysis methods and previously reported by the LHC experiments is also shown. Results of measurements of flow fluctuations evaluated with multi-particle cumulants are shown as a function of transverse momentum and the collision centrality. Models of the initial spatial geometry and its fluctuations fail to describe the flow fluctuations measurements.",
    author = "{The ATLAS Collaboration} and G. Aad and B. Abbott and J. Abdallah and {Abdel Khalek}, S. and O. Abdinov and R. Aben and B. Abi and M. Abolins and AbouZeid, {O. S.} and H. Abramowicz and H. Abreu and R. Abreu and Y. Abulaiti and Acharya, {B. S.} and L. Adamczyk and Adams, {D. L.} and J. Adelman and S. Adomeit and T. Adye and T. Agatonovic-Jovin and Aguilar-Saavedra, {J. A.} and M. Agustoni and Ahlen, {S. P.} and F. Ahmadov and G. Aielli and H. Akerstedt and {\AA}kesson, {T. P A} and G. Akimoto and Akimov, {A. V.} and Alberghi, {G. L.} and J. Albert and S. Albrand and {Alconada Verzini}, {M. J.} and M. Aleksa and Aleksandrov, {I. N.} and C. Alexa and G. Alexander and G. Alexandre and T. Alexopoulos and M. Alhroob and G. Alimonti and L. Alio and J. Alison and Allbrooke, {B. M M} and Allison, {L. J.} and Allport, {P. P.} and J. Almond and A. Aloisio and T. Iizawa and Kohei Yorita",
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    T1 - Measurement of flow harmonics with multi-particle cumulants in Pb+Pb collisions at (Formula presented.) TeV with the ATLAS detector

    AU - The ATLAS Collaboration

    AU - Aad, G.

    AU - Abbott, B.

    AU - Abdallah, J.

    AU - Abdel Khalek, S.

    AU - Abdinov, O.

    AU - Aben, R.

    AU - Abi, B.

    AU - Abolins, M.

    AU - AbouZeid, O. S.

    AU - Abramowicz, H.

    AU - Abreu, H.

    AU - Abreu, R.

    AU - Abulaiti, Y.

    AU - Acharya, B. S.

    AU - Adamczyk, L.

    AU - Adams, D. L.

    AU - Adelman, J.

    AU - Adomeit, S.

    AU - Adye, T.

    AU - Agatonovic-Jovin, T.

    AU - Aguilar-Saavedra, J. A.

    AU - Agustoni, M.

    AU - Ahlen, S. P.

    AU - Ahmadov, F.

    AU - Aielli, G.

    AU - Akerstedt, H.

    AU - Åkesson, T. P A

    AU - Akimoto, G.

    AU - Akimov, A. V.

    AU - Alberghi, G. L.

    AU - Albert, J.

    AU - Albrand, S.

    AU - Alconada Verzini, M. J.

    AU - Aleksa, M.

    AU - Aleksandrov, I. N.

    AU - Alexa, C.

    AU - Alexander, G.

    AU - Alexandre, G.

    AU - Alexopoulos, T.

    AU - Alhroob, M.

    AU - Alimonti, G.

    AU - Alio, L.

    AU - Alison, J.

    AU - Allbrooke, B. M M

    AU - Allison, L. J.

    AU - Allport, P. P.

    AU - Almond, J.

    AU - Aloisio, A.

    AU - Iizawa, T.

    AU - Yorita, Kohei

    PY - 2014/11/1

    Y1 - 2014/11/1

    N2 - ATLAS measurements of the azimuthal anisotropy in lead–lead collisions at (Formula presented.) are shown using a dataset of approximately 7 (Formula presented.) collected at the LHC in 2010. The measurements are performed for charged particles with transverse momenta (Formula presented.) and in the pseudorapidity range (Formula presented.) The anisotropy is characterized by the Fourier coefficients, (Formula presented.), of the charged-particle azimuthal angle distribution for (Formula presented.). The Fourier coefficients are evaluated using multi-particle cumulants calculated with the generating function method. Results on the transverse momentum, pseudorapidity and centrality dependence of the (Formula presented.) coefficients are presented. The elliptic flow, (Formula presented.), is obtained from the two-, four-, six- and eight-particle cumulants while higher-order coefficients, (Formula presented.), are determined with two- and four-particle cumulants. Flow harmonics (Formula presented.) measured with four-particle cumulants are significantly reduced compared to the measurement involving two-particle cumulants. A comparison to (Formula presented.) measurements obtained using different analysis methods and previously reported by the LHC experiments is also shown. Results of measurements of flow fluctuations evaluated with multi-particle cumulants are shown as a function of transverse momentum and the collision centrality. Models of the initial spatial geometry and its fluctuations fail to describe the flow fluctuations measurements.

    AB - ATLAS measurements of the azimuthal anisotropy in lead–lead collisions at (Formula presented.) are shown using a dataset of approximately 7 (Formula presented.) collected at the LHC in 2010. The measurements are performed for charged particles with transverse momenta (Formula presented.) and in the pseudorapidity range (Formula presented.) The anisotropy is characterized by the Fourier coefficients, (Formula presented.), of the charged-particle azimuthal angle distribution for (Formula presented.). The Fourier coefficients are evaluated using multi-particle cumulants calculated with the generating function method. Results on the transverse momentum, pseudorapidity and centrality dependence of the (Formula presented.) coefficients are presented. The elliptic flow, (Formula presented.), is obtained from the two-, four-, six- and eight-particle cumulants while higher-order coefficients, (Formula presented.), are determined with two- and four-particle cumulants. Flow harmonics (Formula presented.) measured with four-particle cumulants are significantly reduced compared to the measurement involving two-particle cumulants. A comparison to (Formula presented.) measurements obtained using different analysis methods and previously reported by the LHC experiments is also shown. Results of measurements of flow fluctuations evaluated with multi-particle cumulants are shown as a function of transverse momentum and the collision centrality. Models of the initial spatial geometry and its fluctuations fail to describe the flow fluctuations measurements.

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