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3–9 Sept 2023
Hilton of the Americas, 1600 Lamar, Houston, Texas, 77010, USA
US/Central timezone

Measurement of J/ψ polarization in Ru+Ru and Zr+Zr collisions at sNN=200 GeV at STAR

5 Sept 2023, 17:30
2h 10m
Grand Ballroom, 4th floor ( Hilton of the Americas)

Grand Ballroom, 4th floor

Hilton of the Americas

Poster Heavy Flavor Poster Session

Speaker

Dandan Shen (Shandong University)

Description

J/ψ serves as an important probe to study the properties of the quark-gluon plasma (QGP) created in heavy-ion collisions. In Ru+Ru and Zr+Zr collisions at sNN=200 GeV, it has been observed that the J/ψ yield is strongly suppressed and its elliptic flow (v2) is consistent with zero, indicating J/ψ's strong coupling with the medium and its potentially small regeneration contribution. Besides those measurements, the J/ψ polarization can shed new light on the QGP properties and the J/ψ production mechanism in heavy-ion collisions. For example, it has been hypothesized that J/ψ can be polarized due to the spin-orbit coupling between J/ψ and QGP's large angular momentum in non-central heavy-ion collisions. The early production of J/ψ also makes its polarization potentially sensitive to the strong magnetic field at the early stage.
In this poster, we will present the first measurement of J/ψ polarization in heavy-ion collisions at RHIC. The J/ψ polarization in the Helicity frame and Collins-Soper frame, as well as with respect to the event-plane, in Ru+Ru and Zr+Zr collisions at sNN=200 GeV will be presented, and its physics implications will be discussed.

Category Experiment
Collaboration (if applicable) The STAR Collaboration

Author

Dandan Shen (Shandong University)

Presentation materials