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

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F24%3A00380204" target="_blank" >RIV/68407700:21340/24:00380204 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1103/PhysRevC.110.014905" target="_blank" >https://doi.org/10.1103/PhysRevC.110.014905</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevC.110.014905" target="_blank" >10.1103/PhysRevC.110.014905</a>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

For the search of the chiral magnetic effect (CME), STAR previously presented the results from isobar collisions (Ru-96(44) + Ru-96(44), Zr-96(40) + Zr-96(40)) obtained through a blind analysis. The ratio of results in Ru + Ru to Zr + Zr collisions for the CME-sensitive charge-dependent azimuthal correlator (Delta gamma), normalized by elliptic anisotropy (v(2)), was observed to be close to but systematically larger than the inverse multiplicity ratio. The background baseline for the isobar ratio, Y = (Delta gamma/v(2))(Ru)/(Delta gamma/v(2))(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 Delta gamma measurement of approximately 10% at a 95% confidence level on in isobar collisions at root S-NN = 200 GeV, with an expected 15% difference in their squared magnetic fields.

Název v anglickém jazyce

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

Popis výsledku anglicky

For the search of the chiral magnetic effect (CME), STAR previously presented the results from isobar collisions (Ru-96(44) + Ru-96(44), Zr-96(40) + Zr-96(40)) obtained through a blind analysis. The ratio of results in Ru + Ru to Zr + Zr collisions for the CME-sensitive charge-dependent azimuthal correlator (Delta gamma), normalized by elliptic anisotropy (v(2)), was observed to be close to but systematically larger than the inverse multiplicity ratio. The background baseline for the isobar ratio, Y = (Delta gamma/v(2))(Ru)/(Delta gamma/v(2))(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 Delta gamma measurement of approximately 10% at a 95% confidence level on in isobar collisions at root S-NN = 200 GeV, with an expected 15% difference in their squared magnetic fields.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10303 - Particles and field physics

Projekt

<a href="/cs/project/LM2023034" target="_blank" >LM2023034: Brookhavenská národní laboratoř – účast České republiky</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2024

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

PHYSICAL REVIEW C

ISSN

2469-9985

e-ISSN

2469-9993

Svazek periodika

110

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

18

Strana od-do

—

Kód UT WoS článku

001362543800001

EID výsledku v databázi Scopus

2-s2.0-85198980756