测量 $\Lambda$ 和 $\bar{\Lambda}$ 超弧核在 $pp$ 碰撞中质量中心内的横向极化
高能物理 - 实验
2026-05-14 v3
摘要
在无偏化的强子-核/原子碰撞中， 超弧核的横向极化已观察50年，然而其极化来源仍是重要的未解之谜。最近的理论框架已在描述这一谜题方面取得进展，涉及极化碎裂函数（PFF）。本文报告首次测量和在无偏化质子-质子碰撞中喷流内的横向极化，该现象直接归因于PFF。极化随喷流横向动量、（）超弧核所占喷流动量比例以及（）相对于喷流轴线的横向动量而测量。这些数据覆盖宽广的喷流能范围，首次为阴离子PFF提供约束，允许测试TMD演化及其普适性。
引用
@article{arxiv.2509.17487,
title = {Measurement of transverse polarization of $\Lambda$ and $\bar{\Lambda}$ hyperons inside jets in $pp$ collisions at $\sqrt{s}=200$ GeV},
author = {STAR Collaboration and B. E. Aboona and J. Adam and G. Agakishiev and I. Aggarwal and M. M. Aggarwal and Z. Ahammed and A. Aitbayev and I. Alekseev and E. Alpatov and A. K. Alshammri and A. Aparin and S. Aslam and J. Atchison and G. S. Averichev and V. Bairathi and X. Bao and P. Barik and K. Barish and S. Behera and P. Bhaga t and A. Bhasin and S. Bhatta and I. G. Bordyuzhin and J. D. Brandenburg and A. V. Brandin and C. Broodo and X. Z. Cai and H. Caines and M. Calderón de la Barca Sánchez and D. Cebra and J. Ceska and I. Chakaberia and Y. S. Chang and Z. Chang and A. Chatterjee and D. Chen and J. H. Chen and L. Chen and Q. Chen and W. Chen and Z. Chen and J. Cheng and Y. Cheng and W. Christie and X. Chu and S. Corey and H. J. Crawford and G. Dale-Gau and A. Das and D. De Souza Lemos and T. G. Dedovich and I. M. Deppner and A. A. Derevschikov and A. Deshpande and A. Dhamija and A. Dimri and P. Dixit and X. Dong and J. L. Drachenberg and E. Duckworth and J. C. Dunlop and Y. 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journal= {arXiv preprint arXiv:2509.17487},
year = {2026}
}