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

doi:10.1016/j.physletb.2018.07.013

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

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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

Bibliographical note

Publisher Copyright:
© 2018

Funding

We thank the RHIC Operations Group and RCF at BNL, the NERSC Center at LBNL, and the Open Science Grid consortium for providing resources and support. This work was supported in part by the Office of Nuclear Physics within the U.S. DOE Office of Science , the U.S. National Science Foundation , the Ministry of Education and Science of the Russian Federation , National Natural Science Foundation of China , Chinese Academy of Science , the Ministry of Science and Technology of China and the Chinese Ministry of Education , the National Research Foundation of Korea , GA and MSMT of the Czech Republic , Department of Atomic Energy and Department of Science and Technology of the Government of India ; the National Science Centre of Poland , National Research Foundation , the Ministry of Science, Education and Sports of the Republic of Croatia, RosAtom of Russia and German Bundesministerium fur Bildung, Wissenschaft, Forschung and Technologie ( BMBF ) and the Helmholtz Association . We thank the RHIC Operations Group and RCF at BNL, the NERSC Center at LBNL, and the Open Science Grid consortium for providing resources and support. This work was supported in part by the Office of Nuclear Physics within the U.S. DOE Office of Science, the U.S. National Science Foundation, the Ministry of Education and Science of the Russian Federation, National Natural Science Foundation of China, Chinese Academy of Science, the Ministry of Science and Technology of China and the Chinese Ministry of Education, the National Research Foundation of Korea, GA and MSMT of the Czech Republic, Department of Atomic Energy and Department of Science and Technology of the Government of India; the National Science Centre of Poland, National Research Foundation, the Ministry of Science, Education and Sports of the Republic of Croatia, RosAtom of Russia and German Bundesministerium fur Bildung, Wissenschaft, Forschung and Technologie (BMBF) and the Helmholtz Association.

Funders	Funder number
RosAtom of Russia and German Bundesministerium fur Bildung, Wissenschaft, Forschung and Technologie
U.S. Department of Energy Chinese Academy of Sciences Guangzhou Municipal Science and Technology Project Oak Ridge National Laboratory Extreme Science and Engineering Discovery Environment National Science Foundation National Energy Research Scientific Computing Center National Natural Science Foundation of China	1614545
U.S. Department of Energy Chinese Academy of Sciences Guangzhou Municipal Science and Technology Project Oak Ridge National Laboratory Extreme Science and Engineering Discovery Environment National Science Foundation National Energy Research Scientific Computing Center National Natural Science Foundation of China
National Science Foundation Office of International Science and Engineering
Horia Hulubei National Institute for Physics and Nuclear Engineering
FP7 Coordination of Non-Community Research Programmes
National Research Foundation South African Research Chair
Department of Science and Technology, Ministry of Science and Technology, India
National Natural Science Foundation of China (NSFC)
Ministerstvo Školství, Mládeže a Tělovýchovy
Ministry of Education of the People's Republic of China
Bundesministerium für Bildung und Forschung
Chinese Academy of Sciences
Ministry of Science and Technology of the People's Republic of China
Ministarstvo Obrazovanja, Znanosti i Sporta
Ministry for Education and Science of the Russian Federation
National Research Foundation of Korea
Narodowe Centrum Nauki
Ministarstvo Obrazovanja, Znanosti i Sporta
Bundesministerium für Bildung und Frauen
Max Delbrück Center for Molecular Medicine in the Helmholtz Association

ASJC Scopus subject areas

Nuclear and High Energy Physics

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10.1016/j.physletb.2018.07.013

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@article{d559aa2b098e4b4781ac688c0af447e6,

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=7.7–200 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 = "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 Chen, \{J. H.\} and X. Chen and R. Fatemi",

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",

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TY - JOUR

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

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 - Chen, J. H.

AU - Chen, X.

AU - Fatemi, 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.

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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

Abstract

Bibliographical note

Funding

ASJC Scopus subject areas

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