TY - JOUR
T1 - Methods for a blind analysis of isobar data collected by the STAR collaboration
AU - Adam, J.
AU - Adamczyk, L.
AU - Adams, J. R.
AU - Adkins, J. K.
AU - Agakishiev, G.
AU - Aggarwal, M. M.
AU - Ahammed, Z.
AU - Alekseev, I.
AU - Anderson, D. M.
AU - Aparin, A.
AU - Aschenauer, E. C.
AU - Ashraf, M. U.
AU - Atetalla, F. G.
AU - Attri, A.
AU - Averichev, G. S.
AU - Bairathi, V.
AU - Barish, K.
AU - Behera, A.
AU - Bellwied, R.
AU - Bhasin, A.
AU - Bielcik, J.
AU - Bielcikova, J.
AU - Bland, L. C.
AU - Bordyuzhin, I. G.
AU - Brandenburg, J. D.
AU - Brandin, A. V.
AU - Butterworth, J.
AU - Caines, H.
AU - de la Barca Sánchez, M. Calderón
AU - Cebra, D.
AU - Chakaberia, I.
AU - Chaloupka, P.
AU - Chan, B. K.
AU - Chang, F. H.
AU - Chang, Z.
AU - Chankova-Bunzarova, N.
AU - Chatterjee, A.
AU - Chen, D.
AU - Chen, J.
AU - Chen, J. H.
AU - Chen, X.
AU - Chen, Z.
AU - Cheng, J.
AU - Cherney, M.
AU - Chevalier, M.
AU - Choudhury, S.
AU - Christie, W.
AU - Chu, X.
AU - Crawford, H. J.
AU - Fatemi, R.
N1 - Publisher Copyright:
© 2021, China Science Publishing & Media Ltd. (Science Press), Shanghai Institute of Applied Physics, the Chinese Academy of Sciences, Chinese Nuclear Society and Springer Nature Singapore Pte Ltd.
PY - 2021/5
Y1 - 2021/5
N2 - In 2018, the STAR collaboration collected data from 4496Ru+4496Ru and 4096Zr+4096Zr 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 4496Ru+4496Ru and 4096Zr+4096Zr. 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 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.
AB - In 2018, the STAR collaboration collected data from 4496Ru+4496Ru and 4096Zr+4096Zr 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 4496Ru+4496Ru and 4096Zr+4096Zr. 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 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.
KW - Blind analysis
KW - Chiral magnetic effect
KW - Heavy-ion collisions
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U2 - 10.1007/s41365-021-00878-y
DO - 10.1007/s41365-021-00878-y
M3 - Article
AN - SCOPUS:85105747528
SN - 1001-8042
VL - 32
JO - Nuclear Science and Techniques
JF - Nuclear Science and Techniques
IS - 5
M1 - 48
ER -