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 J.Cheng G.Eppley E.C.Aschenauer I.Alekseev D.M.Anderson A.Aparin T.D.S.Stanislaus M.U.Ashraf Y.Ji G.Agakishiev P.Huo H.G.Ritter M.Daugherity A.Behera R.Bellwied K.Yip J.Bielcik J.Bielcikova W.J.Llope I.G.Bordyuzhin J.D.Brandenburg A.V.Brandin J.Butterworth S.A.Voloshin M.Calderón de la Barca Sánchez D.J.Stewart R.Witt P.Chaloupka N.Schmitz X.Liu G.Odyniec N.Chankova-Bunzarova A.Chatterjee D.Tlusty X.Huang X.Chen M.L.Kabir Z.Tu M.Cherney S.K.Tripathy S.Choudhury Y.Li X.Chu H.J.Crawford F-H.Chang L.C.Bland D.Grosnick I.M.Deppner A.A.Derevschikov Z.Tang K.Kauder J.L.Drachenberg J.Seger M.Nagy J.Engelage N.Herrmann S.Singha O.Evdokimov R.S.Longacre O.Eyser R.Fatemi A.Pandav D.Keane J.Fedorisin X.Zhu Y.Feng Z.Chen E.Finch Y.Fisyak N.Xu J.Singh C.A.Gagliardi T.Galatyuk W.He A.Gibson K.Gopal H.Caines E.G.Judd W.Guryn A.I.Hamad A.Kechechyan H.S.Matis D.Kincses M.Simko X.H.He R.Sikora S.Heppelmann N.K.Pruthi D.Pawlowska E.Hoffman L.Holub O.V.Rogachevskiy S.Horvat J.S.Wang H.Z.Huang S.L.Huang
• 来源期刊: 核技术（英文版）
• 年，卷（期）: 2021,（5）
• 页码范围: 43-50
• 页数: 8页
• 语种: 英文

摘要

In 2018, the STAR collaboration collected data from 9464 Ru+9464 Ru and 9460 Zr+9460 Zr at sNN√ =200 GeV to search for the presence of the chiral magnetic effect in collisions of nuclei. The isobar collision species alternated frequently between 9464Ru+9464 Ru and 9460Zr+9460 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 proce-dure, analysts completed a 'mock data challenge,' ana-lyzing data from Au+Au collisions at sNN√ =27 GeV, 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.