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Estimate of background baseline and upper limit on the chiral magnetic effect in isobar collisions at √sNN=200 GeV at the BNL Relativistic Heavy Ion Collider

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For the search of the chiral magnetic effect (CME), STAR previously presented the results from isobar collisions (9644Ru+9644Ru, 9640Zr+9640Zr) obtained through a blind analysis. The ratio of results in Ru+Ru to Zr+Zr collisions for the CME-sensitive charge-dependent azimuthal correlator (Δ⁢𝛾), norm...

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Main Authors: Abdulhamid, Muhammad Ibrahim (Author) , Deppner, Ingo Martin (Author) , Leung, Yue (Author) , Söhngen, Yannick (Author) , Weidenkaff, Philipp (Author)
Corporate Author: STAR Collaboration (Author)
Format: Article (Journal)
Language:English
Published: 2024
In: Physical review
Year: 2024, Volume: 110, Issue: 1, Pages: 1-18
ISSN:2469-9993
DOI:10.1103/PhysRevC.110.014905
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/PhysRevC.110.014905
Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/PhysRevC.110.014905
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Author Notes:STAR Collaboration*
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Summary:For the search of the chiral magnetic effect (CME), STAR previously presented the results from isobar collisions (9644Ru+9644Ru, 9640Zr+9640Zr) obtained through a blind analysis. The ratio of results in Ru+Ru to Zr+Zr collisions for the CME-sensitive charge-dependent azimuthal correlator (Δ⁢𝛾), normalized by elliptic anisotropy (𝑣2), was observed to be close to but systematically larger than the inverse multiplicity ratio. The background baseline for the isobar ratio, 𝑌=(Δ⁢𝛾/𝑣2)Ru(Δ⁢𝛾/𝑣2)Zr, is naively expected to be (1/𝑁)Ru(1/𝑁)Zr; however, genuine two- and three-particle correlations are expected to alter it. We estimate the contributions to 𝑌 from those correlations, utilizing both the isobar data and hijing simulations. After including those contributions, we arrive at a final background baseline for 𝑌, which is consistent with the isobar data. We extract an upper limit for the CME fraction in the Δ⁢𝛾 measurement of approximately 10% at a 95% confidence level on in isobar collisions at √𝑠𝑁⁢𝑁=200GeV, with an expected 15% difference in their squared magnetic fields.
Item Description:Veröffentlicht: 09. Juli 2024
*STAR Collaboration: M.I. Abdulhamid, I.M. Deppner, Y.H. Leung, Y. Söhngen, P.C. Weidenkaff [und 351 weitere Personen]
Im Titel steht der Ausdruck "sNN" unter dem Wurzelsymbol
Gesehen am 25.06.2025
Physical Description:Online Resource
ISSN:2469-9993
DOI:10.1103/PhysRevC.110.014905

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