تقرير
Deep Exclusive Meson Production as a probe to the puzzle of $\Lambda$ hyperon polarization
| العنوان: | Deep Exclusive Meson Production as a probe to the puzzle of $\Lambda$ hyperon polarization |
|---|---|
| المؤلفون: | Tu, Zhoudunming |
| سنة النشر: | 2023 |
| المجموعة: | High Energy Physics - Experiment High Energy Physics - Phenomenology Nuclear Experiment Nuclear Theory |
| مصطلحات موضوعية: | High Energy Physics - Phenomenology, High Energy Physics - Experiment, Nuclear Experiment, Nuclear Theory |
| الوصف: | In the 1970s, an unexpected transverse $\Lambda$ 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 $\Lambda$ 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 $\Lambda$ hyperon is not polarized with respect to the initial parton spin direction. How the $\Lambda$ 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 $\Lambda$ polarization. The outcomes of this experimental measurement are anticipated to unveil the dominant mechanism by which $\Lambda$ obtains its spin, eliminating many of the ambiguities that have been encountered in previous studies. Finally, experimental challenges and requirements will be discussed. Comment: Final version published in journal |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevC.109.055205 |
| URL الوصول: | http://arxiv.org/abs/2308.09127 |
| رقم الأكسشن: | edsarx.2308.09127 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevC.109.055205 |
|---|