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Global Polarization of Ξ and Ω Hyperons in Au+Au Collisions at sqrt[s_{NN}]=200 GeV.
Adam, J; Adamczyk, L; Adams, J R; Adkins, J K; Agakishiev, G; Aggarwal, M M; Ahammed, Z; Alekseev, I; Anderson, D M; Aparin, A; Aschenauer, E C; Ashraf, M U; Atetalla, F G; Attri, A; Averichev, G S; Bairathi, V; Barish, K; Behera, A; Bellwied, R; Bhasin, A; Bielcik, J; Bielcikova, J; Bland, L C; Bordyuzhin, I G; Brandenburg, J D; Brandin, A V; Butterworth, J; Caines, H; Calderón de la Barca Sánchez, M; Cebra, D; Chakaberia, I; Chaloupka, P; Chan, B K; Chang, F-H; Chang, Z; Chankova-Bunzarova, N; Chatterjee, A; Chen, D; Chen, J; Chen, J H; Chen, X; Chen, Z; Cheng, J; Cherney, M; Chevalier, M; Choudhury, S; Christie, W; Chu, X; Crawford, H J; Csanád, M.
Afiliación
  • Adam J; Brookhaven National Laboratory, Upton, New York 11973.
  • Adamczyk L; AGH University of Science and Technology, FPACS, Cracow 30-059, Poland.
  • Adams JR; The Ohio State University, Columbus, Ohio 43210.
  • Adkins JK; University of Kentucky, Lexington, Kentucky 40506-0055.
  • Agakishiev G; Joint Institute for Nuclear Research, Dubna 141 980, Russia.
  • Aggarwal MM; Panjab University, Chandigarh 160014, India.
  • Ahammed Z; Variable Energy Cyclotron Centre, Kolkata 700064, India.
  • Alekseev I; Alikhanov Institute for Theoretical and Experimental Physics NRC "Kurchatov Institute," Moscow 117218, Russia.
  • Anderson DM; National Research Nuclear University MEPhI, Moscow 115409, Russia.
  • Aparin A; Texas A&M University, College Station, Texas 77843.
  • Aschenauer EC; Joint Institute for Nuclear Research, Dubna 141 980, Russia.
  • Ashraf MU; Brookhaven National Laboratory, Upton, New York 11973.
  • Atetalla FG; Central China Normal University, Wuhan, Hubei 430079.
  • Attri A; Kent State University, Kent, Ohio 44242.
  • Averichev GS; Panjab University, Chandigarh 160014, India.
  • Bairathi V; Joint Institute for Nuclear Research, Dubna 141 980, Russia.
  • Barish K; Instituto de Alta Investigación, Universidad de Tarapacá, Arica 1000000, Chile.
  • Behera A; University of California, Riverside, California 92521.
  • Bellwied R; State University of New York, Stony Brook, New York 11794.
  • Bhasin A; University of Houston, Houston, Texas 77204.
  • Bielcik J; University of Jammu, Jammu 180001, India.
  • Bielcikova J; Czech Technical University in Prague, FNSPE, Prague 115 19, Czech Republic.
  • Bland LC; Nuclear Physics Institute of the CAS, Rez 250 68, Czech Republic.
  • Bordyuzhin IG; Brookhaven National Laboratory, Upton, New York 11973.
  • Brandenburg JD; Alikhanov Institute for Theoretical and Experimental Physics NRC "Kurchatov Institute," Moscow 117218, Russia.
  • Brandin AV; Brookhaven National Laboratory, Upton, New York 11973.
  • Butterworth J; National Research Nuclear University MEPhI, Moscow 115409, Russia.
  • Caines H; Rice University, Houston, Texas 77251.
  • Calderón de la Barca Sánchez M; Yale University, New Haven, Connecticut 06520.
  • Cebra D; University of California, Davis, California 95616.
  • Chakaberia I; University of California, Davis, California 95616.
  • Chaloupka P; Brookhaven National Laboratory, Upton, New York 11973.
  • Chan BK; Kent State University, Kent, Ohio 44242.
  • Chang FH; Czech Technical University in Prague, FNSPE, Prague 115 19, Czech Republic.
  • Chang Z; University of California, Los Angeles, California 90095.
  • Chankova-Bunzarova N; National Cheng Kung University, Tainan 70101.
  • Chatterjee A; Brookhaven National Laboratory, Upton, New York 11973.
  • Chen D; Joint Institute for Nuclear Research, Dubna 141 980, Russia.
  • Chen J; Central China Normal University, Wuhan, Hubei 430079.
  • Chen JH; University of California, Riverside, California 92521.
  • Chen X; Shandong University, Qingdao, Shandong 266237.
  • Chen Z; Fudan University, Shanghai, 200433.
  • Cheng J; University of Science and Technology of China, Hefei, Anhui 230026.
  • Cherney M; Shandong University, Qingdao, Shandong 266237.
  • Chevalier M; Tsinghua University, Beijing 100084.
  • Choudhury S; Creighton University, Omaha, Nebraska 68178.
  • Christie W; University of California, Riverside, California 92521.
  • Chu X; Fudan University, Shanghai, 200433.
  • Crawford HJ; Brookhaven National Laboratory, Upton, New York 11973.
  • Csanád M; Brookhaven National Laboratory, Upton, New York 11973.
Phys Rev Lett ; 126(16): 162301, 2021 Apr 23.
Article en En | MEDLINE | ID: mdl-33961449
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.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Tipo de estudio: Prognostic_studies Idioma: En Revista: Phys Rev Lett Año: 2021 Tipo del documento: Article Pais de publicación: Estados Unidos
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Tipo de estudio: Prognostic_studies Idioma: En Revista: Phys Rev Lett Año: 2021 Tipo del documento: Article Pais de publicación: Estados Unidos