Global Λ -hyperon polarization in Au+Au collisions at sNN =3 GeV GLOBAL Λ -HYPERON POLARIZATION in ... M. S. ABDALLAH et al.

doi:10.1103/PhysRevC.104.L061901

Global Λ -hyperon polarization in Au+Au collisions at sNN =3 GeV GLOBAL Λ -HYPERON POLARIZATION in ... M. S. ABDALLAH et al.

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Abstract

Global hyperon polarization, P¯H, in Au+Au collisions over a large range of collision energy, sNN, was recently measured and successfully reproduced by hydrodynamic and transport models with intense fluid vorticity of the quark-gluon plasma. While naïve extrapolation of data trends suggests a large P¯H as the collision energy is reduced, the behavior of P¯H at small sNN<7.7 GeV is unknown. Operating the STAR experiment in fixed-target mode, we measured the polarization of Λ hyperons along the direction of global angular momentum in Au+Au collisions at sNN=3 GeV. The observation of substantial polarization of 4.91±0.81(stat.)±0.15(syst.)% in these collisions may require a reexamination of the viscosity of any fluid created in the collision, of the thermalization timescale of rotational modes, and of hadronic mechanisms to produce global polarization.

Original language	English
Article number	L061901
Journal	Physical Review C
Volume	104
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevC.104.L061901
State	Published - Dec 2021

Bibliographical note

Funding Information:
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 Higher Education Sprout Project by Ministry of Education at NCKU, the National Research Foundation of Korea, Czech Science Foundation and Ministry of Education, Youth and Sports of the Czech Republic, Hungarian National Research, Development and Innovation Office, New National Excellency Programme of the Hungarian Ministry of Human Capacities, Department of Atomic Energy and Department of Science and Technology of the Government of India, the National Science Centre of Poland, the Ministry of Science, Education and Sports of the Republic of Croatia, RosAtom of Russia and German Bundesministerium für Bildung, Wissenschaft, Forschung and Technologie (BMBF), Helmholtz Association, Ministry of Education, Culture, Sports, Science, and Technology (MEXT), and Japan Society for the Promotion of Science (JSPS).

Publisher Copyright:
© 2021 American Physical Society.

ASJC Scopus subject areas

Nuclear and High Energy Physics

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10.1103/PhysRevC.104.L061901

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@article{ed4917fa8afe459aac45b772e271795b,

title = "Global Λ -hyperon polarization in Au+Au collisions at sNN =3 GeV GLOBAL Λ -HYPERON POLARIZATION in ... M. S. ABDALLAH et al.",

abstract = "Global hyperon polarization, P¯H, in Au+Au collisions over a large range of collision energy, sNN, was recently measured and successfully reproduced by hydrodynamic and transport models with intense fluid vorticity of the quark-gluon plasma. While na{\"i}ve extrapolation of data trends suggests a large P¯H as the collision energy is reduced, the behavior of P¯H at small sNN<7.7 GeV is unknown. Operating the STAR experiment in fixed-target mode, we measured the polarization of Λ hyperons along the direction of global angular momentum in Au+Au collisions at sNN=3 GeV. The observation of substantial polarization of 4.91±0.81(stat.)±0.15(syst.)% in these collisions may require a reexamination of the viscosity of any fluid created in the collision, of the thermalization timescale of rotational modes, and of hadronic mechanisms to produce global polarization.",

author = "Abdallah, {M. S.} and Aboona, {B. E.} and J. Adam and L. Adamczyk and Adams, {J. R.} and Adkins, {J. K.} and G. Agakishiev and I. Aggarwal and Aggarwal, {M. M.} and Z. Ahammed and I. Alekseev and Anderson, {D. M.} and A. Aparin and Aschenauer, {E. C.} and Ashraf, {M. U.} and Atetalla, {F. G.} and A. Attri and Averichev, {G. S.} and V. Bairathi and W. Baker and {Ball Cap}, {J. G.} and K. Barish and A. Behera and R. Bellwied and P. Bhagat and A. Bhasin and J. Bielcik and J. Bielcikova and Bordyuzhin, {I. G.} and Brandenburg, {J. D.} and Brandin, {A. V.} and I. Bunzarov and J. Butterworth and Cai, {X. Z.} and H. Caines and {Calder{\'o}n De La Barca S{\'a}nchez}, M. and D. Cebra and I. Chakaberia and P. Chaloupka and Chan, {B. K.} and Chang, {F. H.} and Z. Chang and N. Chankova-Bunzarova and A. Chatterjee and S. Chattopadhyay and D. Chen and J. Chen and Chen, {J. H.} and X. Chen and R. Fatemi",

note = "Funding Information: 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 Higher Education Sprout Project by Ministry of Education at NCKU, the National Research Foundation of Korea, Czech Science Foundation and Ministry of Education, Youth and Sports of the Czech Republic, Hungarian National Research, Development and Innovation Office, New National Excellency Programme of the Hungarian Ministry of Human Capacities, Department of Atomic Energy and Department of Science and Technology of the Government of India, the National Science Centre of Poland, the Ministry of Science, Education and Sports of the Republic of Croatia, RosAtom of Russia and German Bundesministerium f{\"u}r Bildung, Wissenschaft, Forschung and Technologie (BMBF), Helmholtz Association, Ministry of Education, Culture, Sports, Science, and Technology (MEXT), and Japan Society for the Promotion of Science (JSPS). Publisher Copyright: {\textcopyright} 2021 American Physical Society. ",

year = "2021",

month = dec,

doi = "10.1103/PhysRevC.104.L061901",

language = "English",

volume = "104",

number = "6",

}

TY - JOUR

T1 - Global Λ -hyperon polarization in Au+Au collisions at sNN =3 GeV GLOBAL Λ -HYPERON POLARIZATION in ... M. S. ABDALLAH et al.

AU - Abdallah, M. S.

AU - Aboona, B. E.

AU - Adam, J.

AU - Adamczyk, L.

AU - Adams, J. R.

AU - Adkins, J. K.

AU - Agakishiev, G.

AU - Aggarwal, I.

AU - Aggarwal, M. M.

AU - Ahammed, Z.

AU - Alekseev, I.

AU - Anderson, D. M.

AU - Aparin, A.

AU - Aschenauer, E. C.

AU - Ashraf, M. U.

AU - Atetalla, F. G.

AU - Attri, A.

AU - Averichev, G. S.

AU - Bairathi, V.

AU - Baker, W.

AU - Ball Cap, J. G.

AU - Barish, K.

AU - Behera, A.

AU - Bellwied, R.

AU - Bhagat, P.

AU - Bhasin, A.

AU - Bielcik, J.

AU - Bielcikova, J.

AU - Bordyuzhin, I. G.

AU - Brandenburg, J. D.

AU - Brandin, A. V.

AU - Bunzarov, I.

AU - Butterworth, J.

AU - Cai, X. Z.

AU - Caines, H.

AU - Calderón De La Barca Sánchez, M.

AU - Cebra, D.

AU - Chakaberia, I.

AU - Chaloupka, P.

AU - Chan, B. K.

AU - Chang, F. H.

AU - Chang, Z.

AU - Chankova-Bunzarova, N.

AU - Chatterjee, A.

AU - Chattopadhyay, S.

AU - Chen, D.

AU - Chen, J.

AU - Chen, J. H.

AU - Chen, X.

AU - Fatemi, R.

N1 - Funding Information: 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 Higher Education Sprout Project by Ministry of Education at NCKU, the National Research Foundation of Korea, Czech Science Foundation and Ministry of Education, Youth and Sports of the Czech Republic, Hungarian National Research, Development and Innovation Office, New National Excellency Programme of the Hungarian Ministry of Human Capacities, Department of Atomic Energy and Department of Science and Technology of the Government of India, the National Science Centre of Poland, the Ministry of Science, Education and Sports of the Republic of Croatia, RosAtom of Russia and German Bundesministerium für Bildung, Wissenschaft, Forschung and Technologie (BMBF), Helmholtz Association, Ministry of Education, Culture, Sports, Science, and Technology (MEXT), and Japan Society for the Promotion of Science (JSPS). Publisher Copyright: © 2021 American Physical Society.

PY - 2021/12

Y1 - 2021/12

N2 - Global hyperon polarization, P¯H, in Au+Au collisions over a large range of collision energy, sNN, was recently measured and successfully reproduced by hydrodynamic and transport models with intense fluid vorticity of the quark-gluon plasma. While naïve extrapolation of data trends suggests a large P¯H as the collision energy is reduced, the behavior of P¯H at small sNN<7.7 GeV is unknown. Operating the STAR experiment in fixed-target mode, we measured the polarization of Λ hyperons along the direction of global angular momentum in Au+Au collisions at sNN=3 GeV. The observation of substantial polarization of 4.91±0.81(stat.)±0.15(syst.)% in these collisions may require a reexamination of the viscosity of any fluid created in the collision, of the thermalization timescale of rotational modes, and of hadronic mechanisms to produce global polarization.

AB - Global hyperon polarization, P¯H, in Au+Au collisions over a large range of collision energy, sNN, was recently measured and successfully reproduced by hydrodynamic and transport models with intense fluid vorticity of the quark-gluon plasma. While naïve extrapolation of data trends suggests a large P¯H as the collision energy is reduced, the behavior of P¯H at small sNN<7.7 GeV is unknown. Operating the STAR experiment in fixed-target mode, we measured the polarization of Λ hyperons along the direction of global angular momentum in Au+Au collisions at sNN=3 GeV. The observation of substantial polarization of 4.91±0.81(stat.)±0.15(syst.)% in these collisions may require a reexamination of the viscosity of any fluid created in the collision, of the thermalization timescale of rotational modes, and of hadronic mechanisms to produce global polarization.

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UR - http://www.scopus.com/inward/citedby.url?scp=85122576172&partnerID=8YFLogxK

U2 - 10.1103/PhysRevC.104.L061901

DO - 10.1103/PhysRevC.104.L061901

M3 - Article

AN - SCOPUS:85122576172

SN - 2469-9985

VL - 104

JO - Physical Review C

JF - Physical Review C

IS - 6

M1 - L061901

ER -

Global Λ -hyperon polarization in Au+Au collisions at sNN =3 GeV GLOBAL Λ -HYPERON POLARIZATION in ... M. S. ABDALLAH et al.

Abstract

Bibliographical note

ASJC Scopus subject areas

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