Journal
PHYSICAL REVIEW C
Volume 105, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevC.105.014901
Keywords
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Funding
- RHIC Operations Group
- RCF at BNL
- NERSC Center at LBNL
- Open Science Grid consortium
- Office of Nuclear Physics within the U.S. DOE Office of Science
- U.S. National Science Foundation
- Ministry of Education and Science of the Russian Federation
- National Natural Science Foundation of China
- Chinese Academy of Science
- Ministry of Science and Technology of China
- Chinese Ministry of Education, the Higher Education Sprout Project by Ministry of Education at NCKU
- National Research Foundation of Korea
- Czech Science Foundation
- Ministry of Education, Youth and Sports of the Czech Republic
- Hungarian National Research, Development and Innovation Office
- New National Excellency Programme of the Hungarian Ministry of Human Capacities
- Department of Atomic Energy of the Government of India
- National Science Centre of Poland, the Ministry of Science, Education and Sports of the Republic of Croatia, RosAtom of Russia
- German Bundesministerium fur Bildung
- Wissenschaft
- Forschung and Technologie (BMBF)
- Helmholtz Association
- Ministry of Education Culture, Sports, Science, and Technology (MEXT) and Japan Society for the Promotion of Science (JSPS)
- Department of Science and Technology of the Government of India
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By performing a blind analysis on a large data sample of isobar collisions, the STAR Collaboration found no evidence of the chiral magnetic effect (CME). Differences in multiplicity and flow harmonics suggest that the CME background varies between different species.
The chiral magnetic effect (CME) is predicted to occur as a consequence of a local violation of P and CP symmetries of the strong interaction amidst a strong electromagnetic field generated in relativistic heavy-ion collisions. Experimental manifestation of the CME involves a separation of positively and negatively charged hadrons along the direction of the magnetic field. Previous measurements of the CME-sensitive charge-separation observables remain inconclusive because of large background contributions. To better control the influence of signal and backgrounds, the STAR Collaboration performed a blind analysis of a large data sample of approximately 3.8 billion isobar collisions of Ru-96(44) +Ru-96(44) and Zr-96(40) + Zr-96(40) at root s(NN) = 200 GeV. Prior to the blind analysis, the CME signatures are predefined as a significant excess of the CME-sensitive observables in Ru + Ru collisions over those in Zr + Zr collisions, owing to a larger magnetic field in the former. A precision down to 0.4% is achieved, as anticipated, in the relative magnitudes of the pertinent observables between the two isobar systems. Observed differences in the multiplicity and flow harmonics at the matching centrality indicate that the magnitude of the CME background is different between the two species. No CME signature that satisfies the predefined criteria has been observed in isobar collisions in this blind analysis.
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