@article{3190669,
    title = "Longitudinal and azimuthal evolution of two-particle transverse momentum
correlations in Pb-Pb collisions at root s(NN)=2.76 TeV",
    author = "Acharya, S. and Adamova, D. and Adhya, S. P. and Adler, A. and and Adolfsson, J. and Aggarwal, M. M. and Rinella, G. Aglieri and Agnello, and M. and Agrawal, N. and Ahammed, Z. and Ahmad, S. and Ahn, S. U. and and Akindinov, A. and Al-Turany, M. and Alam, S. N. and Albuquerque, D. S. and D. and Aleksandrov, D. and Alessandro, B. and Alfanda, H. M. and Alfaro and Molina, R. and Ali, B. and Ali, Y. and Alici, A. and Alkin, A. and Alme, and J. and Alt, T. and Altenkamper, L. and Altsybeev, I and Anaam, M. N. and and Andrei, C. and Andreou, D. and Andrews, H. A. and Andronic, A. and and Angeletti, M. and Anguelov, V and Anson, C. and Anticic, T. and and Antinori, F. and Antonioli, P. and Anwar, R. and Apadula, N. and and Aphecetche, L. and Appelshaeuser, H. and Arcelli, S. and Arnaldi, R. and and Arratia, M. and Arsene, I. C. and Arslandok, M. and Augustinus, A. and and Averbeck, R. and Aziz, S. and Azmi, M. D. and Badala, A. and Baek, Y. 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C. and Wessels, J. and P. and Widmann, E. and Wiechula, J. and Wikne, J. and Wilk, G. and and Wilkinson, J. and Willems, G. A. and Willsher, E. and Windelband, B. and and Witt, W. E. and Wu, Y. and Xu, R. and Yalcin, S. and Yamakawa, K. and and Yang, S. and Yano, S. and Yin, Z. and Yokoyama, H. and Yoo, I-K and and Yoon, J. H. and Yuan, S. and Yuncu, A. and Yurchenko, V and Zaccolo, V and and Zaman, A. and Zampolli, C. and Zanoli, H. J. C. and Zardoshti, N. and and Zarochentsev, A. and Zavada, P. and Zaviyalov, N. and Zbroszczyk, H. and and Zhalov, M. and Zhang, X. and Zhang, Z. and Zhao, C. and and Zherebchevskii, V and Zhigareva, N. and Zhou, D. and Zhou, Y. and Zhou, and Z. and Zhu, J. and Zhu, Y. and Zichichi, A. and Zimmermann, M. B. and and Zinovjev, G. and Zurlo, N. and ALICE Collaboration",
    journal = "PHYSICS LETTERS B",
    year = "2020",
    volume = "804",
    publisher = "Elsevier",
    issn = "0370-2693",
    doi = "10.1016/j.physletb.2020.135375",
    abstract = "This paper presents the first measurements of the charge independent
(CI) and charge dependent (CD) two-particle transverse momentum
correlators G(2)(CI) and G(2)(CD) in Pb-Pb collisions at root sNN= 2.76
TeVby the ALICE collaboration. The two-particle transverse momentum
correlator G(2) was introduced as a measure of the momentum current
transfer between neighboringsystem cells. The correlators are measured
as a function of pair separation in pseudorapidity (Delta eta) and
azimuth (Delta phi) and as a function of collision centrality. From
peripheral to central collisions, the correlator G(2)(CI) exhibits a
longitudinal broadening while undergoing a monotonic azimuthal
narrowing. By contrast, G(2)(CD) 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./sof the
matter produced in the collisions. The observed broadening is found to
be consistent with the hypothesized lower bound of eta/s and is in
qualitative agreement with values obtained from anisotropic flow
measurements. (c) 2020 Conseil Europeen pour la Recherche Nucleaire,.
Published by Elsevier B.V. This is an open access article under the CC
BY license (http://creativecommons.org/licenses/by/4.0/)."
}