Abstract
The hot and dense medium produced in relativistic heavy-ion collisions has been conjectured to be accompanied by an axial charge asymmetry that may lead to a separation of electric charges in the direction of the extremely strong magnetic field, also known as the Chiral Magnetic Effect (CME) [1–3]. The measurement of azimuthal correlator (∆γ) with respect to the spectator plane [5], gives us an opportunity to measure the possible CME fraction beyond the flow background. Preliminary results using this approach with combined Au+Au collisions at √SNN = 200 GeV and U+U at √SNN = 193 GeV show fCME at (8±4±8)%. Meanwhile, the observability of CME has been conjectured to be dependent on √SNN due to changes in the lifetime of the magnetic field, the strengths of CME signal and non-CME background. At lower energies, the Event Plane Detector (EPD) installed in the year 2018 provides a unique capability for CME search. The background scenario test at Au+Au √SNN = GeV by using ∆γ with respect to TPC and the new installed EPD shows a consistency with no-CME scenario in the current statistics. The method of the ongoing isobar blind analysis, and the latest sensitivity check with the eventby- event AVFD model on the different observables between Ru+Ru and Zr+Zr are also briefly discussed.
Highlights
IntroductionIn relativistic heavy-ion collisions, accompanied with the produced hot and dense medium, one conjecture is there could be a symmetry breaking leading to the difference in the number of right-handed and left-handed quarks [1, 2]
Symmetry and it’s breaking are parts of the most fundamental laws in the universe
In relativistic heavy-ion collisions, accompanied with the produced hot and dense medium, one conjecture is there could be a symmetry breaking leading to the difference in the number of right-handed and left-handed quarks [1, 2]
Summary
In relativistic heavy-ion collisions, accompanied with the produced hot and dense medium, one conjecture is there could be a symmetry breaking leading to the difference in the number of right-handed and left-handed quarks [1, 2]. This imbalance leads to a separation of electric charge in the direction of the strong magnetic field (B ∼ 1014 Tesla), produced by the protons in the colliding heavy ions [3]. The ∆γ can be measured with respect to any plane [5, 6]: e.g. using the participate plane, which is estimated by the produced particles (ΨPP); or the spectator plane, which is estimated by the spectators neutrons (ΨS P)
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