Beam energy dependence of rapidity-even dipolar flow in Au+Au collisions

STAR Collaboration

doi:10.1016/j.physletb.2018.07.013

Beam energy dependence of rapidity-even dipolar flow in Au+Au collisions

STAR Collaboration

Creighton University
AGH University of Krakow
Ohio State University
University of Kentucky
Joint Institute for Nuclear Research
Panjab University
Variable Energy Cyclotron Centre India
Stony Brook University
Alikhanov Institute for Theoretical and Experimental Physics
Moscow Engineering Physics Institute
Texas A&M University
University of Tsukuba
Brookhaven National Laboratory
Tsinghua University
Kent State University
Central China Normal University
National Institute of Science Education and Research
University of California at Riverside
University of Houston
University of Jammu
Czech Technical University in Prague
Czech Academy of Sciences
Rice University
Lehigh University
Yale University
University of California at Davis
Shandong University
National Cheng Kung University

Research output: Contribution to journal › Article › peer-review

11 Scopus citations

Abstract

New measurements of directed flow for charged hadrons, characterized by the Fourier coefficient v₁, are presented for transverse momenta p_T, and centrality intervals in Au+Au collisions recorded by the STAR experiment for the center-of-mass energy range s_NN=7.7–200 GeV. The measurements underscore the importance of momentum conservation, and the characteristic dependencies on s_NN, centrality and p_T are consistent with the expectations of geometric fluctuations generated in the initial stages of the collision, acting in concert with a hydrodynamic-like expansion. The centrality and p_T dependencies of v₁ ^even, as well as an observed similarity between its excitation function and that for v₃, could serve as constraints for initial-state models. The v₁ ^even excitation function could also provide an important supplement to the flow measurements employed for precision extraction of the temperature dependence of the specific shear viscosity.

Original language	English
Pages (from-to)	26-32
Number of pages	7
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	784
DOIs	https://doi.org/10.1016/j.physletb.2018.07.013
State	Published - Sep 10 2018

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10.1016/j.physletb.2018.07.013

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@article{aca26c7634b2420fa23a961a0287f5e4,

title = "Beam energy dependence of rapidity-even dipolar flow in Au+Au collisions",

abstract = "New measurements of directed flow for charged hadrons, characterized by the Fourier coefficient v1, are presented for transverse momenta pT, and centrality intervals in Au+Au collisions recorded by the STAR experiment for the center-of-mass energy range sNN=7.7{\textendash}200 GeV. The measurements underscore the importance of momentum conservation, and the characteristic dependencies on sNN, centrality and pT are consistent with the expectations of geometric fluctuations generated in the initial stages of the collision, acting in concert with a hydrodynamic-like expansion. The centrality and pT dependencies of v1 even, as well as an observed similarity between its excitation function and that for v3, could serve as constraints for initial-state models. The v1 even excitation function could also provide an important supplement to the flow measurements employed for precision extraction of the temperature dependence of the specific shear viscosity.",

author = "\{STAR Collaboration\} and J. Adam and L. Adamczyk and Adams, \{J. R.\} and Adkins, \{J. K.\} and G. Agakishiev and Aggarwal, \{M. M.\} and Z. Ahammed and Ajitanand, \{N. N.\} and I. Alekseev and Anderson, \{D. M.\} and R. Aoyama and A. Aparin and D. Arkhipkin and Aschenauer, \{E. C.\} and Ashraf, \{M. U.\} and F. Atetalla and A. Attri and Averichev, \{G. S.\} and X. Bai and V. Bairathi and K. Barish and Bassill, \{A. J.\} and A. Behera and R. Bellwied and A. Bhasin and Bhati, \{A. K.\} and J. Bielcik and J. Bielcikova and Bland, \{L. C.\} and Bordyuzhin, \{I. G.\} and Brandenburg, \{J. D.\} and Brandin, \{A. V.\} and D. Brown and J. Bryslawskyj and I. Bunzarov and J. Butterworth and H. Caines and \{Calder{\'o}n de la Barca S{\'a}nchez\}, M. and Campbell, \{J. M.\} and D. Cebra and I. Chakaberia and P. Chaloupka and Chang, \{F. H.\} and Z. Chang and N. Chankova-Bunzarova and A. Chatterjee and S. Chattopadhyay and R. Esha and J. Jia and R. Lacey",

note = "Publisher Copyright: {\textcopyright} 2018",

year = "2018",

month = sep,

day = "10",

doi = "10.1016/j.physletb.2018.07.013",

language = "English",

volume = "784",

pages = "26--32",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

}

TY - JOUR

T1 - Beam energy dependence of rapidity-even dipolar flow in Au+Au collisions

AU - STAR Collaboration

AU - Adam, J.

AU - Adamczyk, L.

AU - Adams, J. R.

AU - Adkins, J. K.

AU - Agakishiev, G.

AU - Aggarwal, M. M.

AU - Ahammed, Z.

AU - Ajitanand, N. N.

AU - Alekseev, I.

AU - Anderson, D. M.

AU - Aoyama, R.

AU - Aparin, A.

AU - Arkhipkin, D.

AU - Aschenauer, E. C.

AU - Ashraf, M. U.

AU - Atetalla, F.

AU - Attri, A.

AU - Averichev, G. S.

AU - Bai, X.

AU - Bairathi, V.

AU - Barish, K.

AU - Bassill, A. J.

AU - Behera, A.

AU - Bellwied, R.

AU - Bhasin, A.

AU - Bhati, A. K.

AU - Bielcik, J.

AU - Bielcikova, J.

AU - Bland, L. C.

AU - Bordyuzhin, I. G.

AU - Brandenburg, J. D.

AU - Brandin, A. V.

AU - Brown, D.

AU - Bryslawskyj, J.

AU - Bunzarov, I.

AU - Butterworth, J.

AU - Caines, H.

AU - Calderón de la Barca Sánchez, M.

AU - Campbell, J. M.

AU - Cebra, D.

AU - Chakaberia, I.

AU - Chaloupka, P.

AU - Chang, F. H.

AU - Chang, Z.

AU - Chankova-Bunzarova, N.

AU - Chatterjee, A.

AU - Chattopadhyay, S.

AU - Esha, R.

AU - Jia, J.

AU - Lacey, R.

PY - 2018/9/10

Y1 - 2018/9/10

N2 - New measurements of directed flow for charged hadrons, characterized by the Fourier coefficient v1, are presented for transverse momenta pT, and centrality intervals in Au+Au collisions recorded by the STAR experiment for the center-of-mass energy range sNN=7.7–200 GeV. The measurements underscore the importance of momentum conservation, and the characteristic dependencies on sNN, centrality and pT are consistent with the expectations of geometric fluctuations generated in the initial stages of the collision, acting in concert with a hydrodynamic-like expansion. The centrality and pT dependencies of v1 even, as well as an observed similarity between its excitation function and that for v3, could serve as constraints for initial-state models. The v1 even excitation function could also provide an important supplement to the flow measurements employed for precision extraction of the temperature dependence of the specific shear viscosity.

AB - New measurements of directed flow for charged hadrons, characterized by the Fourier coefficient v1, are presented for transverse momenta pT, and centrality intervals in Au+Au collisions recorded by the STAR experiment for the center-of-mass energy range sNN=7.7–200 GeV. The measurements underscore the importance of momentum conservation, and the characteristic dependencies on sNN, centrality and pT are consistent with the expectations of geometric fluctuations generated in the initial stages of the collision, acting in concert with a hydrodynamic-like expansion. The centrality and pT dependencies of v1 even, as well as an observed similarity between its excitation function and that for v3, could serve as constraints for initial-state models. The v1 even excitation function could also provide an important supplement to the flow measurements employed for precision extraction of the temperature dependence of the specific shear viscosity.

UR - https://www.scopus.com/pages/publications/85050549233

U2 - 10.1016/j.physletb.2018.07.013

DO - 10.1016/j.physletb.2018.07.013

M3 - Article

AN - SCOPUS:85050549233

SN - 0370-2693

VL - 784

SP - 26

EP - 32

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

ER -

Beam energy dependence of rapidity-even dipolar flow in Au+Au collisions

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