Flow Dominance and Factorization of Transverse Momentum Correlations in Pb-Pb Collisions at the LHC

J. Adam; D. Adamova; MM. Aggarwal; G.A. Rinella; M. Agnello; N. Agrawal; Z. Ahammed; Shafqat Ahmad; S. U. Ahn; S. Aiola; A. Akindinov; SN Alam; DSD Albuquerque; D. Aleksandrov; B. Alessandro; Alexandre Dufay; Rafael A. Molina; A. Alici; Ian Bearden; Christian Holm Christensen; Kristjan Herlache Gulbrandsen; Jens Jørgen Gaardhøje; Børge Svane Nielsen; Marek Chojnacki; Valentina Zaccolo; You Zhou; Christian Alexander Bourjau; Lais Ozelin de Lima Pimentel; Katarina Gajdosova; Vojtech Pacik; Ante Bilandzic

doi:10.1103/PhysRevLett.118.162302

Flow Dominance and Factorization of Transverse Momentum Correlations in Pb-Pb Collisions at the LHC

J. Adam, D. Adamova, MM. Aggarwal, G.A. Rinella, M. Agnello, N. Agrawal, Z. Ahammed, Shafqat Ahmad, S. U. Ahn, S. Aiola, A. Akindinov, SN Alam, DSD Albuquerque, D. Aleksandrov, B. Alessandro, Alexandre Dufay, Rafael A. Molina, A. Alici, Ian Bearden, Christian Holm ChristensenKristjan Herlache Gulbrandsen, Jens Jørgen Gaardhøje, Børge Svane Nielsen, Marek Chojnacki, Valentina Zaccolo, You Zhou, Christian Alexander Bourjau, Lais Ozelin de Lima Pimentel, Katarina Gajdosova, Vojtech Pacik, Ante Bilandzic

Experimental Particle Physics

4 Citations (Scopus)

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Abstract

We present the first measurement of the two-particle transverse momentum differential correlation function, P2≡ ΔpTΔpT/ pT2, in Pb-Pb collisions at sNN=2.76 TeV. Results for P2 are reported as a function of the relative pseudorapidity (Δη) and azimuthal angle (Δφ) between two particles for different collision centralities. The Δφ dependence is found to be largely independent of Δη for |Δη|≥0.9. In the 5% most central Pb-Pb collisions, the two-particle transverse momentum correlation function exhibits a clear double-hump structure around Δφ=π (i.e., on the away side), which is not observed in number correlations in the same centrality range, and thus provides an indication of the dominance of triangular flow in this collision centrality. Fourier decompositions of P2, studied as a function of the collision centrality, show that correlations at |Δη|≥0.9 can be well reproduced by a flow ansatz based on the notion that measured transverse momentum correlations are strictly determined by the collective motion of the system.

Original language	English
Article number	162302
Journal	Physical Review Letters
Volume	118
Issue number	16
ISSN	0031-9007
DOIs	https://doi.org/10.1103/PhysRevLett.118.162302
Publication status	Published - 21 Apr 2017

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PhysRevLett.118.162302Final published version, 543 KBLicence: CC BY

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Adam, J., Adamova, D., Aggarwal, MM., Rinella, G. A., Agnello, M., Agrawal, N., Ahammed, Z., Ahmad, S., U. Ahn, S., Aiola, S., Akindinov, A., Alam, SN., Albuquerque, DSD., Aleksandrov, D., Alessandro, B., Dufay, A., Molina, R. A., Alici, A., Bearden, I., ... Bilandzic, A. (2017). Flow Dominance and Factorization of Transverse Momentum Correlations in Pb-Pb Collisions at the LHC. Physical Review Letters, 118(16), [162302]. https://doi.org/10.1103/PhysRevLett.118.162302

Adam, J, Adamova, D, Aggarwal, MM, Rinella, GA, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S, U. Ahn, S, Aiola, S, Akindinov, A, Alam, SN, Albuquerque, DSD, Aleksandrov, D, Alessandro, B, Dufay, A, Molina, RA, Alici, A, Bearden, I , Christensen, CH , Gulbrandsen, KH , Gaardhøje, JJ , Nielsen, BS, Chojnacki, M, Zaccolo, V, Zhou, Y, Bourjau, CA, Pimentel, LODL, Gajdosova, K, Pacik, V & Bilandzic, A 2017, 'Flow Dominance and Factorization of Transverse Momentum Correlations in Pb-Pb Collisions at the LHC', Physical Review Letters, vol. 118, no. 16, 162302. https://doi.org/10.1103/PhysRevLett.118.162302

@article{be144e8479614136883a2d5ece23a66c,

title = "Flow Dominance and Factorization of Transverse Momentum Correlations in Pb-Pb Collisions at the LHC",

abstract = "We present the first measurement of the two-particle transverse momentum differential correlation function, P2≡ ΔpTΔpT/ pT2, in Pb-Pb collisions at sNN=2.76 TeV. Results for P2 are reported as a function of the relative pseudorapidity (Δη) and azimuthal angle (Δφ) between two particles for different collision centralities. The Δφ dependence is found to be largely independent of Δη for |Δη|≥0.9. In the 5% most central Pb-Pb collisions, the two-particle transverse momentum correlation function exhibits a clear double-hump structure around Δφ=π (i.e., on the away side), which is not observed in number correlations in the same centrality range, and thus provides an indication of the dominance of triangular flow in this collision centrality. Fourier decompositions of P2, studied as a function of the collision centrality, show that correlations at |Δη|≥0.9 can be well reproduced by a flow ansatz based on the notion that measured transverse momentum correlations are strictly determined by the collective motion of the system.",

author = "J. Adam and D. Adamova and MM. Aggarwal and G.A. Rinella and M. Agnello and N. Agrawal and Z. Ahammed and Shafqat Ahmad and {U. Ahn}, S. and S. Aiola and A. Akindinov and SN Alam and DSD Albuquerque and D. Aleksandrov and B. Alessandro and Alexandre Dufay and Molina, {Rafael A.} and A. Alici and Ian Bearden and Christensen, {Christian Holm} and Gulbrandsen, {Kristjan Herlache} and Gaardh{\o}je, {Jens J{\o}rgen} and Nielsen, {B{\o}rge Svane} and Marek Chojnacki and Valentina Zaccolo and You Zhou and Bourjau, {Christian Alexander} and Pimentel, {Lais Ozelin de Lima} and Katarina Gajdosova and Vojtech Pacik and Ante Bilandzic",

year = "2017",

month = apr,

day = "21",

doi = "10.1103/PhysRevLett.118.162302",

language = "English",

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T1 - Flow Dominance and Factorization of Transverse Momentum Correlations in Pb-Pb Collisions at the LHC

AU - Adam, J.

AU - Adamova, D.

AU - Aggarwal, MM.

AU - Rinella, G.A.

AU - Agnello, M.

AU - Agrawal, N.

AU - Ahammed, Z.

AU - Ahmad, Shafqat

AU - U. Ahn, S.

AU - Aiola, S.

AU - Akindinov, A.

AU - Alam, SN

AU - Albuquerque, DSD

AU - Aleksandrov, D.

AU - Alessandro, B.

AU - Dufay, Alexandre

AU - Molina, Rafael A.

AU - Alici, A.

AU - Bearden, Ian

AU - Christensen, Christian Holm

AU - Gulbrandsen, Kristjan Herlache

AU - Gaardhøje, Jens Jørgen

AU - Nielsen, Børge Svane

AU - Chojnacki, Marek

AU - Zaccolo, Valentina

AU - Zhou, You

AU - Bourjau, Christian Alexander

AU - Pimentel, Lais Ozelin de Lima

AU - Gajdosova, Katarina

AU - Pacik, Vojtech

AU - Bilandzic, Ante

PY - 2017/4/21

Y1 - 2017/4/21

N2 - We present the first measurement of the two-particle transverse momentum differential correlation function, P2≡ ΔpTΔpT/ pT2, in Pb-Pb collisions at sNN=2.76 TeV. Results for P2 are reported as a function of the relative pseudorapidity (Δη) and azimuthal angle (Δφ) between two particles for different collision centralities. The Δφ dependence is found to be largely independent of Δη for |Δη|≥0.9. In the 5% most central Pb-Pb collisions, the two-particle transverse momentum correlation function exhibits a clear double-hump structure around Δφ=π (i.e., on the away side), which is not observed in number correlations in the same centrality range, and thus provides an indication of the dominance of triangular flow in this collision centrality. Fourier decompositions of P2, studied as a function of the collision centrality, show that correlations at |Δη|≥0.9 can be well reproduced by a flow ansatz based on the notion that measured transverse momentum correlations are strictly determined by the collective motion of the system.

AB - We present the first measurement of the two-particle transverse momentum differential correlation function, P2≡ ΔpTΔpT/ pT2, in Pb-Pb collisions at sNN=2.76 TeV. Results for P2 are reported as a function of the relative pseudorapidity (Δη) and azimuthal angle (Δφ) between two particles for different collision centralities. The Δφ dependence is found to be largely independent of Δη for |Δη|≥0.9. In the 5% most central Pb-Pb collisions, the two-particle transverse momentum correlation function exhibits a clear double-hump structure around Δφ=π (i.e., on the away side), which is not observed in number correlations in the same centrality range, and thus provides an indication of the dominance of triangular flow in this collision centrality. Fourier decompositions of P2, studied as a function of the collision centrality, show that correlations at |Δη|≥0.9 can be well reproduced by a flow ansatz based on the notion that measured transverse momentum correlations are strictly determined by the collective motion of the system.

U2 - 10.1103/PhysRevLett.118.162302

DO - 10.1103/PhysRevLett.118.162302

M3 - Journal article

SN - 0031-9007

VL - 118

JO - Physical Review Letters

JF - Physical Review Letters

IS - 16

M1 - 162302

ER -

Flow Dominance and Factorization of Transverse Momentum Correlations in Pb-Pb Collisions at the LHC

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