Speaker
Description
The spin correlation of back-to-back dihadrons emerges in unpolarized high-energy collisions, empowering unpolarized experiments to shed light on spin-dependent fragmentation functions. Transverse spin correlations of partonic $q\bar{q}$ pair manifest through dihadrons, providing a novel probe for the chiral-odd fragmentation function $H_{1T}(z)$. However, although produced gluon also exhibit linear polarization correlations, this effect cannot be observed with $\Lambda-\bar{\Lambda}$ pairs. To overcome this limitation, we propose a novel method to probe gluon linear polarization via energy correlations in hard scattering processes. Performing an all-order CCFM analysis, we utilize the characteristic $\cos 2\phi$ azimuthal modulation of jet energy-energy correlators (EECs) initiated by polarized gluons to extract their linear polarization. Our predictions can be tested at current and future facilities, including the LHC, RHIC, HERA, and the EIC. References: [1]. Lei Yang, Yu-Kun Song, Shu-Yi Wei, Phys.Rev.D 111 (2025) 5, 054035; [2]. Yu-Kun Song, Shu-Yi Wei, Lei Yang, Jian Zhou, Phys.Rev.Lett. 136 (2026) 13, 131901.
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