Methods for a blind analysis of isobar data collected by the STAR collaboration  

作　　者：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.Calderon de la Barca Sanchez 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.Csanad 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 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 

机构地区：[1]Christian University,Abilene,TX 796992 [2]AGH University of Science and Technology,FPACS,Cracow 30-059,Poland [3]Alikhanov Institute for Theoretical and Experimental Physics NRC"Kurchatov Institute",Moscow,Russia 117218 [4]Argonne National Laboratory,Argonne,IL 60439 [5]American University of Cairo,New Cairo,New Cairo 11835,Egypt [6]Brookhaven National Laboratory,Upton,NY 11973 [7]University of California,Berkeley,CA 94720 [8]University of California,Davis,CA 95616 [9]University of California,Los Angeles,CA 90095 [10]University of California,Riverside,CA 92521 [11]Central China Normal University,Wuhan 430079 [12]University of Illinois at Chicago,Chicago,IL 60607 [13]Creighton University,Omaha,NE 68178 [14]Czech Technical University in Prague,FNSPE,Prague 11519,Czech Republic [15]Technische Universitat Darmstadt,Darmstadt 64289,Germany [16]ELTE Eotvos Lorand University,Budapest 1117,Hungary [17]Frankfurt Institute for Advanced Studies FIAS,Frankfurt 60438,Germany [18]Fudan University,Shanghai 200433 [19]University of Heidelberg,69120 Heidelberg,Germany [20]University of Houston,Houston,TX 77204 [21]Huzhou University,Huzhou 313000 [22]Indian Institute of Science Education and Research(IISER),Berhampur 760010,India [23]Indian Institute of Science Education and Research(IISER)Tirupati,Tirupati 517507,India [24]Indian Institute Technology,Patna,Bihar 801106,India [25]Indiana University,Bloomington,IN 47408 [26]Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000 [27]University of Jammu,Jammu 180001,India [28]Joint Institute for Nuclear Research,Dubna,Russia 141980 [29]Kent State University,Kent,OH 44242 [30]University of Kentucky,Lexington,KY 40506-0055 [31]Lawrence Berkeley National Laboratory,Berkeley,CA 94720 [32]Lehigh University,Bethlehem,PA 18015 [33]Max-Planck-Institut fur Physik,80805 Munich,Germany [34]Michigan State University,East Lansing,MI 48824 [35]National Research Nuclear University MEPhI,Moscow,Russia 115409 [36]National Institute of Science Education and Research,HBNI,Jatni 75205

出　　处：《Nuclear Science and Techniques》2021年第5期43-50,共8页核技术（英文）

摘　　要：In 2018,the STAR collaboration collected data from^(96)_(44)Ru+^(96)_(44)Ru and^(96)_(40)Zr+^(96)_(40)Zr at√^(S)NN=200 Ge V to search for the presence of the chiral magnetic effect in collisions of nuclei.The isobar collision species alternated frequently between 9644 Ru+^(96)_(44)Ru and^(96)_(40)Zr+^(96)_(40)Zr.In order to conduct blind analyses of studies related to the chiral magnetic effect in these isobar data,STAR developed a three-step blind analysis procedure.Analysts are initially provided a"reference sample"of data,comprised of a mix of events from the two species,the order of which respects time-dependent changes in run conditions.After tuning analysis codes and performing time-dependent quality assurance on the reference sample,analysts are provided a species-blind sample suitable for calculating efficiencies and corrections for individual≈30-min data-taking runs.For this sample,species-specific information is disguised,but individual output files contain data from a single isobar species.Only run-by-run corrections and code alteration subsequent to these corrections are allowed at this stage.Following these modifications,the"frozen"code is passed over the fully un-blind data,completing the blind analysis.As a check of the feasibility of the blind analysis procedure,analysts completed a"mock data challenge,"analyzing data from Au+Au collisions at√^(S)NN=27 Ge V,collected in 2018.The Au+Au data were prepared in the same manner intended for the isobar blind data.The details of the blind analysis procedure and results from the mock data challenge are presented.

关 键 词：Blind analysis Chiral magnetic effect Heavy-ion collisions 

分 类 号：O571[理学—粒子物理与原子核物理]