Deep Exclusive Meson Production as a probe to the puzzle of $Λ$ hyperon polarization
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arXiv
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2023
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| _version_ | 1866910473064022016 |
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| author | Tu, Zhoudunming |
| author_facet | Tu, Zhoudunming |
| contents | In the 1970s, an unexpected transverse $Λ$ polarization in unpolarized proton-Beryllium collisions was discovered, which initiated extensive studies on spin phenomena in high-energy physics. Over the past five decades, similar transverse $Λ$ polarization has been observed across various collision systems, including lepton-hadron deep inelastic scattering, hadron-hadron collisions, and electron-positron collisions. Despite numerous promising theoretical models, the fundamental mechanism underlying this polarization phenomenon remains inconclusive to this day. However, in both longitudinally and transversely polarized lepton-hadron and hadron-hadron collisions, it is found that the $Λ$ hyperon is not polarized with respect to the initial parton spin direction. How the $Λ$ hyperon acquires its spin has become one of the most crucial questions to address in order to resolve this puzzle. In this paper, I propose to use an exclusive process that can be measured at the Electron-Ion Collider, the Deep Exclusive Meson Production, to explicitly test the mechanism of $Λ$ polarization. The outcomes of this experimental measurement are anticipated to unveil the dominant mechanism by which $Λ$ obtains its spin, eliminating many of the ambiguities that have been encountered in previous studies. Finally, experimental challenges and requirements will be discussed. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2308_09127 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Deep Exclusive Meson Production as a probe to the puzzle of $Λ$ hyperon polarization Tu, Zhoudunming High Energy Physics - Phenomenology High Energy Physics - Experiment Nuclear Experiment Nuclear Theory In the 1970s, an unexpected transverse $Λ$ polarization in unpolarized proton-Beryllium collisions was discovered, which initiated extensive studies on spin phenomena in high-energy physics. Over the past five decades, similar transverse $Λ$ polarization has been observed across various collision systems, including lepton-hadron deep inelastic scattering, hadron-hadron collisions, and electron-positron collisions. Despite numerous promising theoretical models, the fundamental mechanism underlying this polarization phenomenon remains inconclusive to this day. However, in both longitudinally and transversely polarized lepton-hadron and hadron-hadron collisions, it is found that the $Λ$ hyperon is not polarized with respect to the initial parton spin direction. How the $Λ$ hyperon acquires its spin has become one of the most crucial questions to address in order to resolve this puzzle. In this paper, I propose to use an exclusive process that can be measured at the Electron-Ion Collider, the Deep Exclusive Meson Production, to explicitly test the mechanism of $Λ$ polarization. The outcomes of this experimental measurement are anticipated to unveil the dominant mechanism by which $Λ$ obtains its spin, eliminating many of the ambiguities that have been encountered in previous studies. Finally, experimental challenges and requirements will be discussed. |
| title | Deep Exclusive Meson Production as a probe to the puzzle of $Λ$ hyperon polarization |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment Nuclear Experiment Nuclear Theory |
| url | https://arxiv.org/abs/2308.09127 |