基于 SIDIS 数据对胶子 Sivers 不对称性的首次测量
高能物理 - 实验
2017-09-13 v1 高能物理 - 唯象学
摘要
Sivers 函数描述了核子的横向自旋与其部分子的横向运动之间的关联。它从轻子对横向极化核子靶的半包含深度非弹性散射中产生强子的方位角不对称的测量中提取，并且对夸克而言结果非零。在本快报中，给出了同一过程中胶子的 Sivers 不对称性的评估。分析方法基于包含三种硬过程的蒙特卡洛模拟：光子-胶子融合、QCD 康普顿散射和领头阶虚光子吸收过程。利用 LEPTO 事件生成器和神经网络方法，同时提取了这三种过程的 Sivers 不对称性。该方法应用于 COMPASS 数据中包含至少两个具有大横向动量的强子的事件样本，这些数据采用 160 GeV/ 缪子束散射横向极化的氘核和质子获得。以超过两个标准偏差的显著性，得到了胶子 Sivers 不对称性的负值。针对胶子的类 Collins 不对称性的类似分析结果为零一致。
引用
@article{arxiv.1701.02453,
title = {First measurement of the Sivers asymmetry for gluons from SIDIS data},
author = {C. Adolph and M. Aghasyan and R. Akhunzyanov and M. G. Alexeev and G. D. Alexeev and A. Amoroso and V. Andrieux and N. V. Anfimov and V. Anosov and A. Antoshkin and K. Augsten and W. Augustyniak and A. Austregesilo and C. D. R. Azevedo and B. Badelek and F. Balestra and M. Ball and J. Barth and R. Beck and Y. Bedfer and J. Bernhard and K. Bicker and E. R. Bielert and R. Birsa and M. Bodlak and P. Bordalo and F. Bradamante and C. Braun and A. Bressan and M. Buechele and W. -C. Chang and C. Chatterjee and M. Chiosso and I. Choi and S. -U. Chung and A. Cicuttin and M. L. Crespo and Q. Curiel and S. Dalla Torre and S. S. Dasgupta and S. Dasgupta and O. Yu. Denisov and L. Dhara and S. V. Donskov and N. Doshita and Ch. Dreisbach and V. Duic and W. Duennweber and M. Dziewiecki and A. Efremov and P. D. Eversheim and W. Eyrich and M. Faessler and A. Ferrero and M. Finger and M. Finger and H. Fischer and C. Franco and N. du Fresne von Hohenesche and J. M. Friedrich and V. Frolov and E. Fuchey and F. Gautheron and O. P. Gavrichtchouk and S. Gerassimov and J. Giarra and F. Giordano and I. Gnesi and M. Gorzellik and S. Grabmueller and A. Grasso and M. Grosse Perdekamp and B. Grube and T. Grussenmeyer and A. Guskov and F. Haas and D. Hahne and G. Hamar and D. von Harrach and F. H. Heinsius and R. Heitz and F. Herrmann and N. Horikawa and N. d'Hose and C. -Y. Hsieh and S. Huber and S. Ishimoto and A. Ivanov and Yu. Ivanshin and T. Iwata and V. Jary and R. Joosten and P. Joerg and E. Kabuss and A. Kerbizi and B. Ketzer and G. V. Khaustov and Yu. A. Khokhlov and Yu. Kisselev and F. Klein and K. Klimaszewski and J. H. Koivuniemi and V. N. Kolosov and K. Kondo and K. Koenigsmann and I. Konorov and V. F. Konstantinov and A. M. Kotzinian and O. M. Kouznetsov and M. Kraemer and P. Kremser and F. Krinner and Z. V. Kroumchtein and Y. Kulinich and F. Kunne and K. Kurek and R. P. Kurjata and A. A. Lednev and A. Lehmann and M. Levillain and S. Levorato and Y. -S. Lian and J. Lichtenstadt and R. Longo and A. Maggiora and A. Magnon and N. Makins and N. Makke and G. K. Mallot and B. Marianski and A. Martin and J. Marzec and J. Matousek and H. Matsuda and T. Matsuda and G. V. Meshcheryakov and M. Meyer and W. Meyer and Yu. V. Mikhailov and M. Mikhasenko and E. Mitrofanov and N. Mitrofanov and Y. Miyachi and A. Nagaytsev and F. Nerling and D. Neyret and J. Novy and W. -D. Nowak and G. Nukazuka and A. S. Nunes and A. G. Olshevsky and I. Orlov and M. Ostrick and D. Panzieri and B. Parsamyan and S. Paul and J. -C. Peng and F. Pereira and M. Pesek and D. V. Peshekhonov and N. Pierre and S. Platchkov and J. Pochodzalla and V. A. Polyakov and J. Pretz and M. Quaresma and C. Quintans and S. Ramos and C. Regali and G. Reicherz and C. Riedl and N. S. Rogacheva and M. Roskot and D. I. Ryabchikov and A. Rybnikov and A. Rychter and R. Salac and V. D. Samoylenko and A. Sandacz and C. Santos and S. Sarkar and I. A. Savin and T. Sawada and G. Sbrizzai and P. Schiavon and K. Schmidt and H. Schmieden and K. Schoenning and E. Seder and A. Selyunin and L. Silva and L. Sinha and S. Sirtl and M. Slunecka and J. Smolik and A. Srnka and D. Steffen and M. Stolarski and O. Subrt and M. Sulc and H. Suzuki and A. Szabelski and T. Szameitat and P. Sznajder and S. Takekawa and M. Tasevsky and S. Tessaro and F. Tessarotto and F. Thibaud and A. Thiel and F. Tosello and V. Tskhay and S. Uhl and J. Veloso and M. Virius and J. Vondra and S. Wallner and T. Weisrock and M. Wilfert and J. ter Wolbeek and K. Zaremba and P. Zavada and M. Zavertyaev and E. Zemlyanichkina and N. Zhuravlev and M. Ziembicki and A. Zink},
journal= {arXiv preprint arXiv:1701.02453},
year = {2017}
}
备注
18 pages, 8 figures