Transverse spin polarization as a novel probe of medium-induced transverse-momentum-broadening effect
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arXiv
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| Autori principali: | , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866909985188872192 |
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| author | Qin, Xin-yu Song, Yu-Kun Wei, Shu-yi |
| author_facet | Qin, Xin-yu Song, Yu-Kun Wei, Shu-yi |
| contents | The transverse polarization of $Λ$ hyperons within unpolarized jets originates from the transverse-momentum-dependent (TMD) fragmentation function $D_{1T}^\perp (z, p_T, μ^2)$. In the vacuum environment, the QCD evolution of this TMD fragmentation function is governed by the Collins-Soper equation. However, in the presence of the quark-gluon plasma (QGP) medium, the jet-medium interaction induces a transverse-momentum-broadening effect that modifies the QCD evolution. As a result, the transverse spin polarization of $Λ$ hyperons in relativistic heavy-ion collisions differs from that in $pp$ collisions. We demonstrate that this difference serves as a sensitive probe for studying jet-medium interaction, offering a novel perspective through the spin degree of freedom. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_00739 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Transverse spin polarization as a novel probe of medium-induced transverse-momentum-broadening effect Qin, Xin-yu Song, Yu-Kun Wei, Shu-yi High Energy Physics - Phenomenology High Energy Physics - Experiment Nuclear Experiment Nuclear Theory The transverse polarization of $Λ$ hyperons within unpolarized jets originates from the transverse-momentum-dependent (TMD) fragmentation function $D_{1T}^\perp (z, p_T, μ^2)$. In the vacuum environment, the QCD evolution of this TMD fragmentation function is governed by the Collins-Soper equation. However, in the presence of the quark-gluon plasma (QGP) medium, the jet-medium interaction induces a transverse-momentum-broadening effect that modifies the QCD evolution. As a result, the transverse spin polarization of $Λ$ hyperons in relativistic heavy-ion collisions differs from that in $pp$ collisions. We demonstrate that this difference serves as a sensitive probe for studying jet-medium interaction, offering a novel perspective through the spin degree of freedom. |
| title | Transverse spin polarization as a novel probe of medium-induced transverse-momentum-broadening effect |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment Nuclear Experiment Nuclear Theory |
| url | https://arxiv.org/abs/2504.00739 |