作为 $a_1(1420)$ 起源的三角奇点
高能物理 - 唯象学
2021-12-13 v3 高能物理 - 实验
摘要
COMPASS 实验最近发现了一处具有轴矢量量子数的新同位旋矢量共振样信号，即 ，衰变为 。由于其质量过于接近且宽度小于轴矢量基态 ，它立即被解释为一种新的轻味奇特介子，类似于隐粲 sector 中的 、、 态。我们证明， 共振衰变为 并随后通过三角奇点再散射进入耦合的 道，会产生完全符合实验数据的共振样信号。该过程的振幅使用一种基于色散关系的新方法计算。将三角奇点模型拟合至 COMPASS 实验的偏波数据。尽管参数更少，该拟合的优度略优于使用共振假设的拟合，从而无需为描述数据引入额外共振。我们由此首次在轻介子 sector 中证明，实验数据中的共振样结构可由通过三角奇点的再散射描述，为真实的三体效应提供了证据。
引用
@article{arxiv.2006.05342,
title = {Triangle Singularity as the Origin of the $a_1(1420)$},
author = {G. D. Alexeev and M. G. Alexeev and A. Amoroso and V. Andrieux and V. Anosov and A. Antoshkin and K. Augsten and W. Augustyniak 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. Berenguer Antequera and J. Bernhard and M. Bodlak and F. Bradamante and A. Bressan and V. E. Burtsev and W. -C. Chang and C. Chatterjee and M. Chiosso and A. G. Chumakov and S. -U. Chung and A. Cicuttin and P. M. M. Correia and M. L. Crespo and D. D'Ago and S. Dalla Torre and S. S. Dasgupta and S. Dasgupta and I. Denisenko and O. Yu. Denisov and S. V. Donskov and N. Doshita and Ch. Dreisbach and W. Duennweber and R. R. Dusaev and A. Efremov and P. D. Eversheim and P. Faccioli and M. Faessler and M. Finger and M. Finger and H. Fischer and C. Franco and J. M. Friedrich and V. Frolov and F. Gautheron and O. P. Gavrichtchouk and S. Gerassimov and J. Giarra and I. Gnesi and M. Gorzellik and A. Grasso and A. Gridin and M. Grosse Perdekamp and B. Grube and A. Guskov and D. von Harrach 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 T. Iwata and M. Jandek and T. Jary and R. Joosten and P. Joerg and E. Kabuss and F. Kaspar and A. Kerbizi and B. Ketzer and G. V. Khaustov and Yu. A. Khokhlov and Yu. Kisselev and F. Klein and J. H. Koivuniemi and V. N. Kolosov and K. Kondo and I. Konorov and V. F. Konstantinov and A. M. Kotzinian and O. M. Kouznetsov and A. Koval and Z. Kral and F. Krinner and Y. Kulinich and F. Kunne and K. Kurek and R. P. Kurjata and A. Kveton and K. Lavickova and S. Levorato and Y. -S. Lian and J. Lichtenstadt and P. -J. Lin and R. Longo and V. E. Lyubovitskij and A. Maggiora and A. Magnon and N. Makins and N. Makke and G. K. Mallot and A. Maltsev and S. A. Mamon and B. Marianski and A. Martin and J. Marzec and J. Matousek and T. Matsuda and G. Mattson 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. Moretti and A. Nagaytsev and C. Naim and D. Neyret and J. Novy and W. -D. Nowak and G. Nukazuka and A. S. Nunes and A. G. Olshevskiy and M. Ostrick and D. Panzieri and B. Parsamyan and S. Paul and H. Pekeler and J. -C. Peng and M. Pesek and D. V. Peshekhonov and M. Peskova and N. Pierre and S. Platchkov and J. Pochodzalla and V. A. Polyakov and J. Pretz and M. Quaresma and C. Quintans and G. Reicherz and C. Riedl and T. Rudnicki and D. I. Ryabchikov and A. Rybnikov and A. Rychter and V. D. Samoylenko and A. Sandacz and S. Sarkar and I. A. Savin and G. Sbrizzai and H. Schmieden and A. Selyunin and L. Sinha 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 P. Sznajder and S. Tessaro and F. Tessarotto and A. Thiel and J. Tomsa and F. Tosello and A. Townsend and V. Tskhay and S. Uhl and B. I. Vasilishin and A. Vauth and B. M. Veit and J. Veloso and B. Ventura and A. Vidon and M. Virius and M. Wagner and S. Wallner and K. Zaremba and P. Zavada and M. Zavertyaev and M. Zemko and E. Zemlyanichkina and Y. Zhao and M. Ziembicki},
journal= {arXiv preprint arXiv:2006.05342},
year = {2021}
}
备注
7 pages, 5 figures