Display options
Share it on

Phys Rev Lett. 2021 Apr 23;126(16):162301. doi: 10.1103/PhysRevLett.126.162301.

Global Polarization of Ξ and Ω Hyperons in Au+Au Collisions at sqrt[s_{NN}]=200  GeV.

Physical review letters

J Adam, L Adamczyk, J R Adams, J K Adkins, G Agakishiev, M M Aggarwal, Z Ahammed, I Alekseev, D M Anderson, A Aparin, E C Aschenauer, M U Ashraf, F G Atetalla, A Attri, G S Averichev, V Bairathi, K Barish, A Behera, R Bellwied, A Bhasin, J Bielcik, J Bielcikova, L C Bland, I G Bordyuzhin, J D Brandenburg, A V Brandin, J Butterworth, H Caines, M Calderón de la Barca Sánchez, D Cebra, I Chakaberia, P Chaloupka, B K Chan, F-H Chang, Z Chang, N Chankova-Bunzarova, A Chatterjee, D Chen, J Chen, J H Chen, X Chen, Z Chen, J Cheng, M Cherney, M Chevalier, S Choudhury, W Christie, X Chu, H J Crawford, M Csanád, M Daugherity, T G Dedovich, I M Deppner, A A Derevschikov, L Didenko, X Dong, J L Drachenberg, J C Dunlop, T Edmonds, N Elsey, J Engelage, G Eppley, S Esumi, O Evdokimov, A Ewigleben, O Eyser, R Fatemi, S Fazio, P Federic, J Fedorisin, C J Feng, Y Feng, P Filip, E Finch, Y Fisyak, A Francisco, L Fulek, C A Gagliardi, T Galatyuk, F Geurts, N Ghimire, A Gibson, K Gopal, X Gou, D Grosnick, W Guryn, A I Hamad, A Hamed, S Harabasz, J W Harris, S He, W He, X H He, Y He, S Heppelmann, S Heppelmann, N Herrmann, E Hoffman, L Holub, Y Hong, S Horvat, Y Hu, H Z Huang, S L Huang, T Huang, X Huang, T J Humanic, P Huo, G Igo, D Isenhower, W W Jacobs, C Jena, A Jentsch, Y Ji, J Jia, K Jiang, S Jowzaee, X Ju, E G Judd, S Kabana, M L Kabir, S Kagamaster, D Kalinkin, K Kang, D Kapukchyan, K Kauder, H W Ke, D Keane, A Kechechyan, M Kelsey, Y V Khyzhniak, D P Kikoła, C Kim, B Kimelman, D Kincses, T A Kinghorn, I Kisel, A Kiselev, M Kocan, L Kochenda, L K Kosarzewski, L Kramarik, P Kravtsov, K Krueger, N Kulathunga Mudiyanselage, L Kumar, S Kumar, R Kunnawalkam Elayavalli, J H Kwasizur, R Lacey, S Lan, J M Landgraf, J Lauret, A Lebedev, R Lednicky, J H Lee, Y H Leung, C Li, C Li, W Li, W Li, X Li, Y Li, Y Liang, R Licenik, T Lin, Y Lin, M A Lisa, F Liu, H Liu, P Liu, P Liu, T Liu, X Liu, Y Liu, Z Liu, T Ljubicic, W J Llope, R S Longacre, N S Lukow, S Luo, X Luo, G L Ma, L Ma, R Ma, Y G Ma, N Magdy, R Majka, D Mallick, S Margetis, C Markert, H S Matis, J A Mazer, N G Minaev, S Mioduszewski, B Mohanty, I Mooney, Z Moravcova, D A Morozov, M Nagy, J D Nam, Md Nasim, K Nayak, D Neff, J M Nelson, D B Nemes, M Nie, G Nigmatkulov, T Niida, L V Nogach, T Nonaka, A S Nunes, G Odyniec, A Ogawa, S Oh, V A Okorokov, B S Page, R Pak, A Pandav, Y Panebratsev, B Pawlik, D Pawlowska, H Pei, C Perkins, L Pinsky, R L Pintér, J Pluta, B R Pokhrel, J Porter, M Posik, N K Pruthi, M Przybycien, J Putschke, H Qiu, A Quintero, S K Radhakrishnan, S Ramachandran, R L Ray, R Reed, H G Ritter, O V Rogachevskiy, J L Romero, L Ruan, J Rusnak, N R Sahoo, H Sako, S Salur, J Sandweiss, S Sato, W B Schmidke, N Schmitz, B R Schweid, F Seck, J Seger, M Sergeeva, R Seto, P Seyboth, N Shah, E Shahaliev, P V Shanmuganathan, M Shao, A I Sheikh, W Q Shen, S S Shi, Y Shi, Q Y Shou, E P Sichtermann, R Sikora, M Simko, J Singh, S Singha, N Smirnov, W Solyst, P Sorensen, H M Spinka, B Srivastava, T D S Stanislaus, M Stefaniak, D J Stewart, M Strikhanov, B Stringfellow, A A P Suaide, M Sumbera, B Summa, X M Sun, X Sun, Y Sun, Y Sun, B Surrow, D N Svirida, P Szymanski, A H Tang, Z Tang, A Taranenko, T Tarnowsky, J H Thomas, A R Timmins, D Tlusty, M Tokarev, C A Tomkiel, S Trentalange, R E Tribble, P Tribedy, S K Tripathy, O D Tsai, Z Tu, T Ullrich, D G Underwood, I Upsal, G Van Buren, J Vanek, A N Vasiliev, I Vassiliev, F Videbæk, S Vokal, S A Voloshin, F Wang, G Wang, J S Wang, P Wang, Y Wang, Y Wang, Z Wang, J C Webb, P C Weidenkaff, L Wen, G D Westfall, H Wieman, S W Wissink, R Witt, Y Wu, Z G Xiao, G Xie, W Xie, H Xu, N Xu, Q H Xu, Y F Xu, Y Xu, Z Xu, Z Xu, C Yang, Q Yang, S Yang, Y Yang, Z Yang, Z Ye, Z Ye, L Yi, K Yip, Y Yu, H Zbroszczyk, W Zha, C Zhang, D Zhang, S Zhang, S Zhang, X P Zhang, Y Zhang, Y Zhang, Z J Zhang, Z Zhang, Z Zhang, J Zhao, C Zhong, C Zhou, X Zhu, Z Zhu, M Zurek, M Zyzak,

Affiliations

  1. Brookhaven National Laboratory, Upton, New York 11973.
  2. AGH University of Science and Technology, FPACS, Cracow 30-059, Poland.
  3. The Ohio State University, Columbus, Ohio 43210.
  4. University of Kentucky, Lexington, Kentucky 40506-0055.
  5. Joint Institute for Nuclear Research, Dubna 141 980, Russia.
  6. Panjab University, Chandigarh 160014, India.
  7. Variable Energy Cyclotron Centre, Kolkata 700064, India.
  8. Alikhanov Institute for Theoretical and Experimental Physics NRC "Kurchatov Institute," Moscow 117218, Russia.
  9. National Research Nuclear University MEPhI, Moscow 115409, Russia.
  10. Texas A&M University, College Station, Texas 77843.
  11. Central China Normal University, Wuhan, Hubei 430079.
  12. Kent State University, Kent, Ohio 44242.
  13. Instituto de Alta Investigación, Universidad de Tarapacá, Arica 1000000, Chile.
  14. University of California, Riverside, California 92521.
  15. State University of New York, Stony Brook, New York 11794.
  16. University of Houston, Houston, Texas 77204.
  17. University of Jammu, Jammu 180001, India.
  18. Czech Technical University in Prague, FNSPE, Prague 115 19, Czech Republic.
  19. Nuclear Physics Institute of the CAS, Rez 250 68, Czech Republic.
  20. Rice University, Houston, Texas 77251.
  21. Yale University, New Haven, Connecticut 06520.
  22. University of California, Davis, California 95616.
  23. University of California, Los Angeles, California 90095.
  24. National Cheng Kung University, Tainan 70101.
  25. Shandong University, Qingdao, Shandong 266237.
  26. Fudan University, Shanghai, 200433.
  27. University of Science and Technology of China, Hefei, Anhui 230026.
  28. Tsinghua University, Beijing 100084.
  29. Creighton University, Omaha, Nebraska 68178.
  30. University of California, Berkeley, California 94720.
  31. ELTE Eötvös Loránd University, Budapest, Hungary H-1117.
  32. Abilene Christian University, Abilene, Texas 79699.
  33. University of Heidelberg, Heidelberg 69120, Germany.
  34. NRC "Kurchatov Institute," Institute of High Energy Physics, Protvino 142281, Russia.
  35. Lawrence Berkeley National Laboratory, Berkeley, California 94720.
  36. Purdue University, West Lafayette, Indiana 47907.
  37. Wayne State University, Detroit, Michigan 48201.
  38. University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan.
  39. University of Illinois at Chicago, Chicago, Illinois 60607.
  40. Lehigh University, Bethlehem, Pennsylvania 18015.
  41. Southern Connecticut State University, New Haven, Connecticut 06515.
  42. Technische Universität Darmstadt, Darmstadt 64289, Germany.
  43. Temple University, Philadelphia, Pennsylvania 19122.
  44. Valparaiso University, Valparaiso, Indiana 46383.
  45. Indian Institute of Science Education and Research (IISER) Tirupati, Tirupati 517507, India.
  46. American University of Cairo, New Cairo 11835, New Cairo, Egypt.
  47. Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, Gansu 730000.
  48. Pennsylvania State University, University Park, Pennsylvania 16802.
  49. Indiana University, Bloomington, Indiana 47408.
  50. Warsaw University of Technology, Warsaw 00-661, Poland.
  51. Frankfurt Institute for Advanced Studies FIAS, Frankfurt 60438, Germany.
  52. Argonne National Laboratory, Argonne, Illinois 60439.
  53. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800.
  54. National Institute of Science Education and Research, HBNI, Jatni 752050, India.
  55. University of Texas, Austin, Texas 78712.
  56. Rutgers University, Piscataway, New Jersey 08854.
  57. Indian Institute of Science Education and Research (IISER), Berhampur 760010, India.
  58. Institute of Nuclear Physics PAN, Cracow 31-342, Poland.
  59. Max-Planck-Institut für Physik, Munich 80805, Germany.
  60. Indian Institute Technology, Patna, Bihar 801106, India.
  61. Universidade de São Paulo, São Paulo, Brazil 05314-970.
  62. Huzhou University, Huzhou, Zhejiang 313000.
  63. Michigan State University, East Lansing, Michigan 48824.
  64. United States Naval Academy, Annapolis, Maryland 21402.

PMID: 33961449 DOI: 10.1103/PhysRevLett.126.162301

Abstract

Global polarization of Ξ and Ω hyperons has been measured for the first time in Au+Au collisions at sqrt[s_{NN}]=200  GeV. The measurements of the Ξ^{-} and Ξ[over ¯]^{+} hyperon polarization have been performed by two independent methods, via analysis of the angular distribution of the daughter particles in the parity violating weak decay Ξ→Λ+π, as well as by measuring the polarization of the daughter Λ hyperon, polarized via polarization transfer from its parent. The polarization, obtained by combining the results from the two methods and averaged over Ξ^{-} and Ξ[over ¯]^{+}, is measured to be ⟨P_{Ξ}⟩=0.47±0.10(stat)±0.23(syst)% for the collision centrality 20%-80%. The ⟨P_{Ξ}⟩ is found to be slightly larger than the inclusive Λ polarization and in reasonable agreement with a multiphase transport model. The ⟨P_{Ξ}⟩ is found to follow the centrality dependence of the vorticity predicted in the model, increasing toward more peripheral collisions. The global polarization of Ω, ⟨P_{Ω}⟩=1.11±0.87(stat)±1.97(syst)% was obtained by measuring the polarization of daughter Λ in the decay Ω→Λ+K, assuming the polarization transfer factor C_{ΩΛ}=1.

Publication Types