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

Adam, J.; Adamova, D.; Aggarwal, M M; Aglieri Rinella, G; Agnello, M.; Agrawal, N; Christiansen, Peter LU ; Ljunggren, Martin LU ; Oskarsson, Anders LU and Richert, Tuva LU , et al. (2017) In Physical Review Letters 118(16).
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.... (More)
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. © 2017 CERN, for the ALICE Collaboration. (Less)
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Contribution to journal
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subject
keywords
Momentum, Tellurium compounds, Azimuthal angle, Collective motions, Differential correlation, Fourier decomposition, Pb-Pb collisions, Pseudorapidities, Transverse momenta, Two particles, Lead
in
Physical Review Letters
volume
118
issue
16
publisher
American Physical Society
external identifiers
  • scopus:85018468686
  • wos:000399819100006
ISSN
1079-7114
DOI
10.1103/PhysRevLett.118.162302
language
English
LU publication?
yes
id
fd28b05b-de1a-4fc8-9e4c-1a2d908cba8e
date added to LUP
2017-06-12 11:54:21
date last changed
2017-09-18 11:40:08
@article{fd28b05b-de1a-4fc8-9e4c-1a2d908cba8e,
  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. © 2017 CERN, for the ALICE Collaboration.},
  articleno    = {162302},
  author       = {Adam, J. and Adamova, D. and Aggarwal, M M and Aglieri Rinella, G and Agnello, M. and Agrawal, N and Christiansen, Peter and Ljunggren, Martin and Oskarsson, Anders and Richert, Tuva and Silvermyr, David and Stenlund, Evert and Vislavicius, Vytautas and , },
  issn         = {1079-7114},
  keyword      = {Momentum,Tellurium compounds,Azimuthal angle,Collective motions,Differential correlation,Fourier decomposition,Pb-Pb collisions,Pseudorapidities,Transverse momenta,Two particles,Lead},
  language     = {eng},
  number       = {16},
  publisher    = {American Physical Society},
  series       = {Physical Review Letters},
  title        = {Flow Dominance and Factorization of Transverse Momentum Correlations in Pb-Pb Collisions at the LHC},
  url          = {http://dx.doi.org/10.1103/PhysRevLett.118.162302},
  volume       = {118},
  year         = {2017},
}