Upper limit on the chiral magnetic effect in isobar collisions at the Relativistic Heavy-Ion Collider

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F24%3A00380512" target="_blank" >RIV/68407700:21340/24:00380512 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1103/PhysRevResearch.6.L032005" target="_blank" >https://doi.org/10.1103/PhysRevResearch.6.L032005</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/PhysRevResearch.6.L032005" target="_blank" >10.1103/PhysRevResearch.6.L032005</a>

Result language
angličtina
Original language name
Upper limit on the chiral magnetic effect in isobar collisions at the Relativistic Heavy-Ion Collider
Original language description
The chiral magnetic effect (CME) is a phenomenon that arises from the QCD anomaly in the presence of an external magnetic field. The experimental search for its evidence has been one of the key goals of the physics program of the Relativistic Heavy-Ion Collider. The STAR Collaboration has previously presented the results of a blind analysis of isobar collisions (Ru-96(44)+ (96)(44) Ru, Zr-96(40) + Zr-96(40)) in the search for the CME. The isobar ratio (Y) of CME-sensitive observable, charge separation scaled by elliptic anisotropy, is close to but systematically larger than the inverse multiplicity ratio, the naive background baseline. This indicates the potential existence of a CME signal and the presence of remaining nonflow background due to two- and three-particle correlations, which are different between the isobars. In this postblind analysis, we estimate the contributions from those nonflow correlations as a background baseline to Y, utilizing the isobar data as well as Heavy Ion Jet Interaction Generator simulations. This baseline is found consistent with the isobar ratio measurement, and an upper limit of 10% at 95% confidence level is extracted for the CME fraction in the charge separation measurement in isobar collisions at root s(NN) = 200 GeV.
Czech name
—
Czech description
—

Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
10303 - Particles and field physics

Project
<a href="/en/project/LM2023034" target="_blank" >LM2023034: Brookhaven National Laboratory - Participation of the Czech Republic</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Similar results(10)