Observation of Directed Flow of Hypernuclei _{Λ}^{3}H and _{Λ}^{4}H in sqrt[s_{NN}]=3 GeV Au+Au Collisions at RHIC.
B E Aboona,J Adam,J R Adams,G Agakishiev,I Aggarwal,M M Aggarwal,Z Ahammed,A Aitbaev,I Alekseev,D M Anderson,A Aparin,J Atchison,G S Averichev,V Bairathi,W Baker,J G Ball Cap,K Barish,P Bhagat,A Bhasin,S Bhatta,I G Bordyuzhin,J D Brandenburg,A V Brandin,X Z Cai,H Caines,M Calderón de la Barca Sánchez,D Cebra,J Ceska,I Chakaberia,B K Chan,Z Chang,D Chen,J Chen,J H Chen,Z Chen,J Cheng,Y Cheng,S Choudhury,W Christie,X Chu,H J Crawford,G Dale-Gau,A Das,M Daugherity,T G Dedovich,I M Deppner,A A Derevschikov,A Dhamija,L Di Carlo,L Didenko,P Dixit,X Dong,J L Drachenberg,E Duckworth,J C Dunlop,J Engelage,G Eppley,S Esumi,O Evdokimov,A Ewigleben,O Eyser,R Fatemi,S Fazio,C J Feng,Y Feng,E Finch,Y Fisyak,F A Flor,C Fu,F Geurts,N Ghimire,A Gibson,K Gopal,X Gou,D Grosnick,A Gupta,A Hamed,Y Han,M D Harasty,J W Harris,H Harrison,W He,X H He,Y He,C Hu,Q Hu,Y Hu,H Huang,H Z Huang,S L Huang,T Huang,X Huang,Y Huang,Y Huang,T J Humanic,D Isenhower,M Isshiki,W W Jacobs,A Jalotra,C Jena,Y Ji,J Jia,C Jin,X Ju,E G Judd,S Kabana,M L Kabir,D Kalinkin,K Kang,D Kapukchyan,K Kauder,H W Ke,D Keane,A Kechechyan,M Kelsey,B Kimelman,A Kiselev,A G Knospe,H S Ko,L Kochenda,A A Korobitsin,P Kravtsov,L Kumar,S Kumar,R Kunnawalkam Elayavalli,R Lacey,J M Landgraf,A Lebedev,R Lednicky,J H Lee,Y H Leung,N Lewis,C Li,C Li,W Li,X Li,Y Li,Y Li,Z Li,X Liang,Y Liang,T Lin,C Liu,F Liu,H Liu,H Liu,L Liu,T Liu,X Liu,Y Liu,Z Liu,T Ljubicic,W J Llope,O Lomicky,R S Longacre,E Loyd,T Lu,N S Lukow,X F Luo,V B Luong,L Ma,R Ma,Y G Ma,N Magdy,D Mallick,S Margetis,H S Matis,J A Mazer,G McNamara,K Mi,N G Minaev,B Mohanty,I Mooney,D A Morozov,A Mudrokh,M I Nagy,A S Nain,J D Nam,Md Nasim,D Neff,J M Nelson,D B Nemes,M Nie,G Nigmatkulov,T Niida,R Nishitani,L V Nogach,T Nonaka,A S Nunes,G Odyniec,A Ogawa,S Oh,V A Okorokov,K Okubo,B S Page,R Pak,J Pan,A Pandav,A K Pandey,Y Panebratsev,T Pani,P Parfenov,A Paul,C Perkins,B R Pokhrel,M Posik,T Protzman,N K Pruthi,J Putschke,Z Qin,H Qiu,A Quintero,C Racz,S K Radhakrishnan,N Raha,R L Ray,H G Ritter,C W Robertson,O V Rogachevsky,M A Rosales Aguilar,D Roy,L Ruan,A K Sahoo,N R Sahoo,H Sako,S Salur,E Samigullin,S Sato,W B Schmidke,N Schmitz,J Seger,R Seto,P Seyboth,N Shah,E Shahaliev,P V Shanmuganathan,M Shao,T Shao,M Sharma,N Sharma,R Sharma,S R Sharma,A I Sheikh,D Y Shen,K Shen,S S Shi,Y Shi,Q Y Shou,F Si,J Singh,S Singha,P Sinha,M J Skoby,Y Söhngen,Y Song,B Srivastava,T D S Stanislaus,D J Stewart,M Strikhanov,B Stringfellow,Y Su,C Sun,X Sun,Y Sun,Y Sun,B Surrow,D N Svirida,Z W Sweger,A Tamis,A H Tang,Z Tang,A Taranenko,T Tarnowsky,J H Thomas,D Tlusty,T Todoroki,M V Tokarev,C A Tomkiel,S Trentalange,R E Tribble,P Tribedy,O D Tsai,C Y Tsang,Z Tu,T Ullrich,D G Underwood,I Upsal,G Van Buren,A N Vasiliev,V Verkest,F Videbæk,S Vokal,S A Voloshin,F Wang,G Wang,J S Wang,X Wang,Y Wang,Y Wang,Y Wang,Z Wang,J C Webb,P C Weidenkaff,G D Westfall,H Wieman,G Wilks,S W Wissink,J Wu,J Wu,X Wu,Y Wu,B Xi,Z G Xiao,W Xie,H Xu,N Xu,Q H Xu,Y Xu,Y Xu,Z Xu,Z Xu,G Yan,Z Yan,C Yang,Q Yang,S Yang,Y Yang,Z Ye,Z Ye,L Yi,K Yip,Y Yu,W Zha,C Zhang,D Zhang,J Zhang,S Zhang,X Zhang,Y Zhang,Y Zhang,Y Zhang,Z J Zhang,Z Zhang,Z Zhang,F Zhao,J Zhao,M Zhao,C Zhou,J Zhou,S Zhou,Y Zhou,X Zhu,M Zurek,M Zyzak,
Physical review letters（2023）
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摘要
We report here the first observation of directed flow (v_{1}) of the hypernuclei _{Λ}^{3}H and _{Λ}^{4}H in mid-central Au+Au collisions at sqrt[s_{NN}]=3 GeV at RHIC. These data are taken as part of the beam energy scan program carried out by the STAR experiment. From 165×10^{6} events in 5%-40% centrality, about 8400 _{Λ}^{3}H and 5200 _{Λ}^{4}H candidates are reconstructed through two- and three-body decay channels. We observe that these hypernuclei exhibit significant directed flow. Comparing to that of light nuclei, it is found that the midrapidity v_{1} slopes of _{Λ}^{3}H and _{Λ}^{4}H follow baryon number scaling, implying that the coalescence is the dominant mechanism for these hypernuclei production in the 3 GeV Au+Au collisions.
