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Sep 24 – 29, 2023
US/Eastern timezone

Global spin alignment of \rho^0 meson in Au+Au and Isobar (Zr+Zr and Ru+Ru) collisions at 200 GeV

Not scheduled
20m
Junior A3 (Durham Convention Center)

Junior A3

Durham Convention Center

Talk Spin in Heavy Ion Collisions Spin in Heavy Ion Collisions

Speaker

Baoshan XI (Fudan University)

Description

The search for the Chiral Magnetic Effect (CME) is ongoing in relativistic heavy-ion experiments. It is crucial to scrutinize the CME-sensitive observables to rule out non-CME contributions. Recently STAR has measured an unexpectedly large signal of global spin alignment ($\rho_{00}$) for $\phi$ meson, which is argued to be sensitive to the local fluctuations of the vector meson strong force field[1]. A finite $\rho_{00}$ of vector mesons can influence CME-sensitive observables. In particular, the $\rho_{00}$ of $\rho^0$ mesons can induce a positive (negative) contribution to the CME observables, depending on the deviation of $\rho_{00}$ being larger (smaller) than 1/3 [2,3]. In this talk, we will present measurements of the global spin alignment for $\rho^0$ meson as functions of transverse momentum and centrality in Au+Au and Isobar (Zr+Zr and Ru+Ru) collisions at $\sqrt{s_{NN}}$ = 200 GeV. We will discuss the implications of our results in the context of interpreting CME observables.

[1] M. S. Abdallah et al. (STAR Collaboration), Nature 614, 244 (2023).
[2] A. Tang, Chin. Phys. C 44, 054101 (2020).
[3] D. Shen, J. Chen, A. Tang, G. Wang, Phys. Lett. B 839, 137777 (2023).

Primary author

Baoshan XI (Fudan University)

Presentation materials

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