强 QCD 区质子的自旋结构函数 $g_2$ 与广义极化率
核实验
2022-04-27 v2 高能物理 - 实验
摘要
强相互作用在低能或低动量转移 的相互作用下尚不被很好地理解，但我们所拥有的最清晰的见解之一来自手征微扰论（PT）。这一有效处理方法给出了核子广义极化率——描述核子对外场响应的基本量——的可检验预言。我们已在预期 PT 成立的区域内测量了质子的广义自旋极化率。我们的结果包含了横向-纵向自旋极化率 的首次数据，并首次将极化率 的覆盖扩展至极低的 。这些结果提取自结构函数 的矩，该量是刻画质子内部自旋结构的量。我们的实验在 Jefferson Lab 进行，使用了极化电子束和极化固体氨（NH）靶。尽管 极化率对高共振贡献的敏感性降低，它仍是 PT 难以重现的量；近期相互竞争的计算彼此分歧，并在极低 下与测得的中子数据偏离。我们的质子结果为现有计算提供了判别力，并将有助于更好地理解这一强 QCD 区。
引用
@article{arxiv.2204.10224,
title = {The Proton Spin Structure Function $g_2$ and Generalized Polarizabilities in the Strong QCD Regime},
author = {D. Ruth and R. Zielinski and C. Gu and M. Allada and T. Badman and M. Huang and J. Liu and P. Zhu and K. Allada and J. Zhang and A. Camsonne and J. P. Chen and K. Slifer and K. Aniol and J. Annand and J. Arrington and T. Averett and H. Baghdasaryan and V. Bellini and W. Boeglin and J. Brock and C. Carlin and C. Chen and E. Cisbani and D. Crabb and A. Daniel and D. Day and R. Duve and L. El Fassi and M. Friedman and E. Fuchey and H. Gao and R. Gilman and S. Glamazdin and P. Gueye and M. Hafez and Y. Han and O. Hansen and M. Hashemi Shabestari and O. Hen and D. Higinbotham and T. Horn and S. Iqbal and E. Jensen and H. Kang and C. D. Keith and A. Kelleher and D. Keller and H. Khanal and I. Korover and G. Kumbartzki and W. Li and J. Lichtenstadt and R. Lindgren and E. Long and S. Malace and P. Markowitz and J. Maxwell and D. M. Meekins and Z. E. Meziani and C. McLean and R. Michaels and M. Mihovilovic and N. Muangma and C. Munoz Camacho and J. Musson and K. Myers and Y. Oh and M. Pannunzio Carmignotto and C. Perdrisat and S. Phillips and E. Piasetzky and J. Pierce and V. Punjabi and Y. Qiang and P. E. Reimer and Y. Roblin and G. Ron and O. Rondon and G. Russo and K. Saenboonruang and B. Sawatzky and A. Shahinyan and R. Shneor and J. Sjoegren and P. Solvignon-Slifer and N. Sparveris and V. Sulkosky and F. Wesselmann and W. Yan and H. Yang and H. Yao and Z. Ye and M. Yurov and Y. Zhang and Y. X. Zhao and X. Zheng},
journal= {arXiv preprint arXiv:2204.10224},
year = {2022}
}