Event-by-event correlations between Λ (Λ¯) hyperon global polarization and handedness with charged hadron azimuthal separation in Au+Au

M. I. Abdulhamid,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,S. Aslam,J. Atchison,G. S. Averichev,V. Bairathi,W. Baker,J. Ball,K. N. Barish,P. Bhagat,A. Bhasin,Somadutta 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,A. Chatterjee,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. Feng,Y. Feng,E. Finch,Y. Fisyak,F. A. Flor,C. Fu,F. J. M. Geurts,Nirmal Ghimire,A. Gibson,K. Gopal,X. Gou,D. Grosnick,A. Gupta,A. Hamed,Yi Fei Han,M. D. Harasty,J. W. Harris,H. Harrison-Smith,W. He,X. He,Yang He,C. Hu,Q. Hu,Y. Hu,H. Z. Huang,H. Z. Huang,S. Huang,T. Huang,X. Huang,Y. Huang, Y. Huang,T. J. Humanic,D. Isenhower,M. Isshiki,W. W. Jacobs,Ashish Jalotra,C. Jena,Y. Ji,J. Jia,C. Jin,X. Ju,E. G. Judd,S. Kabana,M. L. Kabir,D. Kalinkin, K. H. Kang,D. Kapukchyan,D. Keane,A. Kechechyan,M. Kelsey,B. Kimelman,A. Kiselev,A. G. Knospe,H. S. Ko,L. Kochenda,A. A. Korobitsin,П. Кравцов,L. Kumar,Sanjeev Kumar,Raghav Kunnawalkam Elayavalli,R. Lacey,J. M. Landgraf,A. Lebedev,R. Lednický,J. H. Lee,Y. H. Leung,N. A. Lewis,C. Li,W. Li,X. Li,Y. Li, Y. Li,Z. Li,X. Liang,Y. Liang,T. H. Lin,C. Liu,F. Liu,G. Liu,H. Liu, H. Liu,L. Liu,T. Liu,X. Liu,Y. Liu,Z. Liu,T. Ljubičić,W. J. Llope,O. Lomicky,R. S. Longacre,E. Loyd,Tingting Lu,N. S. Lukow,X. Luo,V. B. Luong,L. Ma,R. Ma,Yugang Ma,N. Magdy,Dukhishyam Mallick,S. Margetis,H. S. Matis,J. Mazer,G. McNamara,K. Mi,N. G. Minaev,B. Mohanty,M. M. Mondal,I. Mooney,Д. А. Морозов,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,G. Odyniec,A. Ogawa,S. B. Oh,V. 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. H. Qin,H. Qiu,A. Quintero,C. Racz,S. K. Radhakrishnan,N. Raha,R. L. Ray,H. G. Ritter,Charles W. Robertson,O. V. Rogachevsky,M. A. Rosales Aguilar,D. Roy,L. Ruan,A. K. Sahoo,N. Sahoo, H. Sako,S. Salur,E. Samigullin,Susumu Sato,W. B. Schmidke,N. Schmitz,J. Seger,R. Seto,P. Seyboth,N. Shah,E. Shahaliev,P. V. Shanmuganathan,T. Shao,Meenakshi Sharma,N. Sharma,R. Sharma,Sayantan Sharma,A. I. Sheikh,D. Y. Shen,K. Shen,S. S. Shi,Y. Shi,Q. Shou,F. Si,J. B. Singh,S. Singha,P. Sinha,M. J. Skoby,Y. Söhngen,Y. Song,B. Srivastava,T. D. S. Stanislaus,David 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. Tokarev,C. A. Tomkiel,S. Trentalange,R. E. Tribble,P. Tribedy,O. D. Tsai,C. Y. Tsang,Z. Tu,J. Tyler,T. Ullrich,D. G. Underwood,I. Upsal,G. Van Buren,A. Vasiliev,V. Verkest,F. Videbæk,S. Vokál,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,Jin Wu,Jin Wu,X. Wu,Y. F. Wu,B. Xi,Xiao Zhang,G. Xie,W. Xie,H. Xu,N. Xu,Q. H. Xu,Y. Xu, Y. Xu,Z. Xu, Z. Xu,Yan Gao,Z. Yan,C. Yang, Qiang Yang, Shuo Yang,Y. Yang,Z. Ye, Z. Ye,L. Yi,K. Yip,Y. Yu,W. Zha,C. Zhang,D. Zhang,J. Zhang,S. Zhang,W. Zhang,X. Zhang,Y. Zhang, Y. Zhang,Y. Zhang, Z. J. Zhang,Z. Zhang,Z. Zhang,Fanyi Zhao,J. Zhao, M. G. Zhao,C. Zhou, Jian Zhou,S. Zhou,Y. Zhou,Xinmei Zhu,M. Żurek,M. Zyzak

Physical Review C(2023)

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Abstract
Global polarizations ($P$) of $\Lambda$ ($\bar{\Lambda}$) hyperons have been observed in non-central heavy-ion collisions. The strong magnetic field primarily created by the spectator protons in such collisions would split the $\Lambda$ and $\bar{\Lambda}$ global polarizations ($\Delta P = P_{\Lambda} - P_{\bar{\Lambda}} < 0$). Additionally, quantum chromodynamics (QCD) predicts topological charge fluctuations in vacuum, resulting in a chirality imbalance or parity violation in a local domain. This would give rise to an imbalance ($\Delta n = \frac{N_{\text{L}} - N_{\text{R}}}{\langle N_{\text{L}} + N_{\text{R}} \rangle} \neq 0$) between left- and right-handed $\Lambda$ ($\bar{\Lambda}$) as well as a charge separation along the magnetic field, referred to as the chiral magnetic effect (CME). This charge separation can be characterized by the parity-even azimuthal correlator ($\Delta\gamma$) and parity-odd azimuthal harmonic observable ($\Delta a_{1}$). Measurements of $\Delta P$, $\Delta\gamma$, and $\Delta a_{1}$ have not led to definitive conclusions concerning the CME or the magnetic field, and $\Delta n$ has not been measured previously. Correlations among these observables may reveal new insights. This paper reports measurements of correlation between $\Delta n$ and $\Delta a_{1}$, which is sensitive to chirality fluctuations, and correlation between $\Delta P$ and $\Delta\gamma$ sensitive to magnetic field in Au+Au collisions at 27 GeV. For both measurements, no correlations have been observed beyond statistical fluctuations.
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Key words
hadron azimuthal separation,hyperon global polarization,handedness,correlations,event-by-event
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