Longitudinal and azimuthal evolution of two-particle transverse momentum correlations in Pb-Pb collisions at √sNN= 2.76 TeV
(2020) In Physics Letters B 804.- Abstract
- This paper presents the first measurements of the charge independent
(CI) and charge dependent (CD) two-particle transverse momentum
correlators G2CI and G2CD in Pb–Pb collisions at √SNN=2.76 TeV by the ALICE collaboration. The two-particle transverse momentum correlator G2 was introduced as a measure of the momentum current transfer between
neighboring system cells. The correlators are measured as a function of
pair separation in pseudorapidity (Δη) and azimuth (Δφ) and as a function of collision centrality. From peripheral to central collisions, the correlator G2CI exhibits a longitudinal... (More) - This paper presents the first measurements of the charge independent
(CI) and charge dependent (CD) two-particle transverse momentum
correlators G2CI and G2CD in Pb–Pb collisions at √SNN=2.76 TeV by the ALICE collaboration. The two-particle transverse momentum correlator G2 was introduced as a measure of the momentum current transfer between
neighboring system cells. The correlators are measured as a function of
pair separation in pseudorapidity (Δη) and azimuth (Δφ) and as a function of collision centrality. From peripheral to central collisions, the correlator G2CI exhibits a longitudinal broadening while undergoing a monotonic azimuthal narrowing. By contrast, G2CD exhibits a narrowing along both dimensions. These features are not
reproduced by models such as HIJING and AMPT. However, the observed
narrowing of the correlators from peripheral to central collisions is
expected to result from the stronger transverse flow profiles produced
in more central collisions and the longitudinal broadening is predicted
to be sensitive to momentum currents and the shear viscosity per unit of
entropy density η/s of the matter produced in the collisions. The observed broadening is
found to be consistent with the hypothesized lower bound of η/s and is in qualitative agreement with values obtained from anisotropic flow measurements. (Less)
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- author
- author collaboration
- organization
- publishing date
- 2020-03-20
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Physics Letters B
- volume
- 804
- article number
- 135375
- pages
- 13 pages
- publisher
- Elsevier
- external identifiers
-
- scopus:85082403717
- ISSN
- 0370-2693
- DOI
- 10.1016/j.physletb.2020.135375
- language
- English
- LU publication?
- yes
- id
- 2b93375e-e57b-47c8-a001-547ae3602ae3
- date added to LUP
- 2021-04-12 16:00:02
- date last changed
- 2023-04-02 06:37:25
@article{2b93375e-e57b-47c8-a001-547ae3602ae3, abstract = {{This paper presents the first measurements of the charge independent <br> (CI) and charge dependent (CD) two-particle transverse momentum <br> correlators <i>G</i><sub>2</sub><sup>CI</sup> and G<sub>2</sub><sup>CD</sup> in Pb–Pb collisions at √<i>S</i><sub>NN</sub>=2.76 TeV by the ALICE collaboration. The two-particle transverse momentum correlator <i>G</i><sub>2 </sub>was introduced as a measure of the momentum current transfer between <br> neighboring system cells. The correlators are measured as a function of <br> pair separation in pseudorapidity (Δ<em>η</em>) and azimuth (Δ<em>φ</em>) and as a function of collision centrality. From peripheral to central collisions, the correlator G<sub>2</sub><sup>CI</sup> exhibits a longitudinal broadening while undergoing a monotonic azimuthal narrowing. By contrast, G<sub>2</sub><sup>CD</sup> exhibits a narrowing along both dimensions. These features are not <br> reproduced by models such as HIJING and AMPT. However, the observed <br> narrowing of the correlators from peripheral to central collisions is <br> expected to result from the stronger transverse flow profiles produced <br> in more central collisions and the longitudinal broadening is predicted <br> to be sensitive to momentum currents and the shear viscosity per unit of<br> entropy density <i>η</i>/<i>s</i> of the matter produced in the collisions. The observed broadening is <br> found to be consistent with the hypothesized lower bound of <i>η</i>/<i>s</i> and is in qualitative agreement with values obtained from anisotropic flow measurements.}}, author = {{Acharya, S. and Adolfsson, J. and Christiansen, P. and Matonoha, O. and Nassirpour, A.F. and Ohlson, A. and Oskarsson, A. and Richert, T. and V. Rueda, O. and Silvermyr, D. and Stenlund, E. and Zurlo, N.}}, issn = {{0370-2693}}, language = {{eng}}, month = {{03}}, publisher = {{Elsevier}}, series = {{Physics Letters B}}, title = {{Longitudinal and azimuthal evolution of two-particle transverse momentum correlations in Pb-Pb collisions at √<i>s</i><sub>NN</sub>= 2.76 TeV}}, url = {{http://dx.doi.org/10.1016/j.physletb.2020.135375}}, doi = {{10.1016/j.physletb.2020.135375}}, volume = {{804}}, year = {{2020}}, }