Deciphering the RΨm correlator in search for the chiral magnetic effect in relativistic heavy ion collisions

Investigation of Experimental Observables in Search of the Chiral Magnetic Effect in Heavy-ion Collisions in the STAR experiment

“…When we repeat the calculations of the R correlator and the γ 112 correlator both with the true reaction plane and with the same kinematic cuts (not following the frozen code anymore), σ −1 R2 and ∆γ 112 do exhibit comparable significance values (not shown in this article), consistent with findings in Ref. [48]. Therefore, this result, the toy model studies and Eqs.…”

“…Although the background contributions depend on spectra and particularly elliptic flow of resonances [43,44,47], to the first order, we expect the three observables to have similar responses to resonance decays for a wide range of spectra or elliptic flow. A recent study [48] has also found that the R correlator and the ∆γ 112 correlator have similar sensitivities to the CME signal and the background.…”

Investigation of experimental observables in search of the chiral magnetic effect in heavy-ion collisions in the STAR experiment *

“…However, these observables may not serve as good background estimates for or . Indeed, background-only AMPT calculations show that and are not equal to in Au+Au collisions at 200 GeV [62]. Therefore, in the following sections, we will not extend our method study to these derivative correlators.…”