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22–26 Sep 2025
Asia/Shanghai timezone

Measurement of transverse polarization of $\Lambda$/$\bar{\Lambda}$ inside jets in unpolarized $pp$ collisions at $\sqrt{s}=200$ GeV

Not scheduled
3h 30m
Oral Three-dimensional structure of the nucleon: transverse momentum dependent parton distributions Parallel

Speaker

涛亚 高 (Shandong University)

Description

The fragmentation process has been proposed as a possible origin of the transverse $\Lambda$ polarization, described by polarizing fragmentation functions (pFFs). In $pp$ collisions, this mechanism can be studied by measuring the $\Lambda$ polarization within jets. We present the first measurement of the transverse polarization of $\Lambda$/$\overline{\Lambda}$ hyperons relative to the jet axis in unpolarized $pp$ collisions at $\sqrt{s}=200$ GeV, using high-statistics data from the STAR experiment. The dependence of the $\Lambda$ polarization on the jet transverse momentum ($p_T^{\text{jet}}$) is observed. The polarization is also studied as a function of the jet momentum fraction ($z$) carried by the $\Lambda$/$\overline{\Lambda}$, and the $\Lambda$/$\overline{\Lambda}$ momentum transverse to the jet axis ($j_T$). These results provide a critical test of the pFFs universality and new insights into the mechanisms behind the transverse $\Lambda$ polarization.

Primary author

涛亚 高 (Shandong University)

Presentation materials

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