长程距离下质子自旋结构的测量
核实验
2022-01-13 v2 高能物理 - 实验
摘要
测量质子和中子的自旋结构检验了我们对它们如何由夸克和胶子（核物质的基本组成单元）产生的理解。在长程距离下，强相互作用的耦合常数变得很大，需要非微扰方法来计算量子色动力学过程，例如格点规范理论或有效场论。本文报道了通过极化电子束散射极化质子得到的质子自旋结构测量。自旋相关截面在长程距离下测得，对应于低动量转移平方在 0.012 至 1.0 GeV 之间的区域。该运动学范围对手征有效场论预言提供了独特的检验。我们的结果表明，对核子自旋的完整描述仍然难以实现，并呼吁进一步的理论工作，例如格点量子色动力学。最后，我们外推至光子点的数据与 Gerasimov-Drell-Hearn 求和规则一致，该量子场论的基本预言将质子的反常磁矩与其积分自旋相关截面联系起来。
引用
@article{arxiv.2102.02658,
title = {Measurement of the proton spin structure at long distances},
author = {X. Zheng and A. Deur and H. Kang and S. E. Kuhn and M. Ripani and J. Zhang and K. P. Adhikari and S. Adhikari and M. J. Amaryan and H. Atac and H. Avakian and L. Barion and M. Battaglieri and I. Bedlinskiy and F. Benmokhtar and A. Bianconi and A. S. Biselli and S. Boiarinov and M. Bondi and F. Bossu and P. Bosted and W. J. Briscoe and J. Brock and W. K. Brooks and D. Bulumulla and V. D. Burkert and C. Carlin and D. S. Carman and J. C. Carvajal and A. Celentano and P. Chatagnon and T. Chetry and J. -P. Chen and S. Choi and G. Ciullo and L. Clark and P. L. Cole and M. Contalbrigo and V. Crede and A. D'Angelo and N. Dashyan and R. De Vita and M. Defurne and S. Diehl and C. Djalali and V. A. Drozdov and R. Dupre and M. Ehrhart and A. El Alaoui and L. Elouadrhiri and P. Eugenio and G. Fedotov and S. Fegan and R. Fersch and A. Filippi and T. A. Forest and Y. Ghandilyan and G. P. Gilfoyle and K. L. Giovanetti and F. -X. Girod and D. I. Glazier and R. W. Gothe and K. A. Griffioen and M. Guidal and N. Guler and L. Guo and K. Hafidi and H. Hakobyan and M. Hattawy and T. B. Hayward and D. Heddle and K. Hicks and A. Hobart and T. Holmstrom and M. Holtrop and Y. Ilieva and D. G. Ireland and E. L. Isupov and H. S. Jo and K. Joo and S. Joosten and C. D. Keith and D. Keller and A. Khanal and M. Khandaker and C. W. Kim and W. Kim and F. J. Klein and A. Kripko and V. Kubarovsky and L. Lanza and M. Leali and P. Lenisa and K. livingston and E. Long and I. J. D. MacGregor and N. Markov and L. Marsicano and V. Mascagna and B. McKinnon and D. G. Meekins and T. Mineeva and M. Mirazita and V. Mokeev and C. Mullen and P. Nadel-Turonski and K. Neupane and S. Niccolai and M. Osipenko and A. I. Ostrovidov and M. Paolone and L. Pappalardo and K. Park and E. Pasyuk and W. Phelps and S. K. Phillips and O. Pogorelko and J. Poudel and Y. Prok and B. A. Raue and J. Ritman and A. Rizzo and G. Rosner and P. Rossi and J. Rowley and F. Sabatie and C. Salgado and A. Schmidt and R. A. Schumacher and M. L. Seely and Y. G. Sharabian and U. Shrestha and S. Sirca and K. Slifer and N. Sparveris and S. Stepanyan and I. I. Strakovsky and S. Strauch and V. Sulkosky and N. Tyler and M. Ungaro and L. Venturelli and H. Voskanyan and E. Voutier and D. P. Watts and X. Wei and L. B. Weinstein and M. H. Wood and B. Yale and N. Zachariou and Z. W. Zhao},
journal= {arXiv preprint arXiv:2102.02658},
year = {2022}
}
备注
Published version. 10 pages, 5 figures. 20 pages of supplementary material (data tables and a figure)