Global Polarization Of Xi And Omega Hyperons In Au Plus Au Collisions At Root S-Nn=200 Gev

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,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,W Li,X Li,Y Li,Y Liang, R Licenik,T Lin,Y Lin, M A Lisa,F Liu, H 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, 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,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,C Yang,Q Yang,S Yang,Y Yang,Z Yang,Z Ye, L Yi,K Yip,Y Yu, H Zbroszczyk,W Zha,C Zhang,D Zhang,S Zhang,X P Zhang,Y Zhang,Z J Zhang,Z Zhang,J Zhao,C Zhong,C Zhou,X Zhu,Z Zhu,M Zurek, M Zyzak

PHYSICAL REVIEW LETTERS（2021）

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摘要

Global polarization of Xi and Omega hyperons has been measured for the first time in Au + Au collisions at root S-NN= 200 GeV. The measurements of the Xi(-) and (Xi) over bar (+) 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 Xi -> Lambda + pi, as well as by measuring the polarization of the daughter A hyperon, polarized via polarization transfer from its parent. The polarization, obtained by combining the results from the two methods and averaged over Xi(-) and (Xi) over bar (+), is measured to be < P-Xi > = 0.47 +/- 0.10(stat) +/- 0.23(syst)% for the collision centrality 20%-80%. The < P-Xi > is found to be slightly larger than the inclusive Lambda polarization and in reasonable agreement with a multiphase transport model. The < P-Xi > is found to follow the centrality dependence of the vorticity predicted in the model, increasing toward more peripheral collisions. The global polarization of Omega, < P-Omega > = 1.11 +/- 0.87(stat) +/- 1.97(syst)% was obtained by measuring the polarization of daughter Lambda in the decay Omega -> Lambda + K, assuming the polarization transfer factor C-Omega Lambda = 1.

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