带电π介子极化率的测量
高能物理 - 实验
2015-03-05 v2 核实验
摘要
CERN 的 COMPASS 合作组在质心能量低于 3.5 倍π介子质量的条件下研究了π介子康普顿散射过程 。该过程嵌入在反应 中，由能量为 190\,GeV 的π介子束轰击镍靶引发。通过分离在最小动量转移 \,(GeV/) 处观测到的尖锐库仑峰，筛选出准实光子交换过程。基于 63\,000 个事例的样本，在假设 （即关联电偶极极化率与磁偶极极化率）的前提下，测定π介子电极化率为 。这是对该强相互作用基本低能参数迄今最精确的测量，长期以来各种方法得出的结果存在冲突。虽然该结果与此前的专用测量存在张力，但与手征微扰理论的预期相符。此外，还进行了一项将π介子替换为μ介子的补充测量，鉴于μ介子的截面行为是明确已知的，该测量用于对系统误差进行独立估算。
引用
@article{arxiv.1405.6377,
title = {Measurement of the charged-pion polarisability},
author = {C. Adolph and R. Akhunzyanov and M. G. Alexeev and G. D. Alexeev and A. Amoroso and V. Andrieux and V. Anosov and A. Austregesilo and B. Badelek and F. Balestra and J. Barth and G. Baum and R. Beck and Y. Bedfer and A. Berlin and J. Bernhard and K. Bicker and J. Bieling and R. Birsa and J. Bisplinghoff and M. Bodlak and M. Boer and P. Bordalo and F. Bradamante and C. Braun and A. Bressan and M. Buechele and E. Burtin and L. Capozza and M. Chiosso and S. U. Chung and A. Cicuttin and M. Colantoni and M. L. Crespo and Q. Curiel and S. Dalla Torre and S. S. Dasgupta and S. Dasgupta and O. Yu. Denisov and A. M. Dinkelbach and S. V. Donskov and N. Doshita and V. Duic and W. Duennweber and M. Dziewiecki and A. Efremov and C. Elia and P. D. Eversheim and W. Eyrich and M. Faessler and A. Ferrero and A. Filin and M. Finger and M. jr. Finger and H. Fischer and C. Franco and N. du Fresne von Hohenesche and J. M. Friedrich and V. Frolov and F. Gautheron and O. P. Gavrichtchouk and S. Gerassimov and R. Geyer and I. Gnesi and B. Gobbo and S. Goertz and M. Gorzellik and S. Grabmueller and A. Grasso and B. Grube and T. Grussenmeyer and A. Guskov and T. Guthoerl and F. Haas and D. von Harrach and D. Hahne and R. Hashimoto and F. H. Heinsius and F. Herrmann and F. Hinterberger and Ch. Hoeppner and N. Horikawa and N. d'Hose and S. Huber and S. Ishimoto and A. Ivanov and Yu. Ivanshin and T. Iwata and R. Jahn and V. Jary and P. Jasinski and P. Joerg and R. Joosten and E. Kabuss 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. Kouznetsov and M. Kraemer and Z. V. Kroumchtein and N. Kuchinski and R. Kuhn and F. Kunne and K. Kurek and R. P. Kurjata and A. A. Lednev and A. Lehmann and M. Levillain and S. Levorato and J. Lichtenstadt and A. Maggiora and A. Magnon and N. Makke and G. K. Mallot and C. Marchand and A. Martin and J. Marzec and J. Matousek and H. Matsuda and T. Matsuda and G. Meshcheryakov and W. Meyer and T. Michigami and Yu. V. Mikhailov and Y. Miyachi and M. A. Moinester and A. Nagaytsev and T. Nagel and F. Nerling and S. Neubert and D. Neyret and V. I. Nikolaenko and J. Novy and W. -D. Nowak and A. S. Nunes and A. G. Olshevsky and I. Orlov and M. Ostrick and R. Panknin and D. Panzieri and B. Parsamyan and S. Paul and D. Peshekhonov 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 E. Rocco and N. S. Rossiyskaya and D. I. Ryabchikov and A. Rychter and V. D. Samoylenko and A. Sandacz and S. Sarkar and I. A. Savin and G. Sbrizzai and P. Schiavon and C. Schill and T. Schlueter and K. Schmidt and H. Schmieden and K. Schoenning and S. Schopferer and M. Schott and O. Yu. Shevchenko and L. Silva and L. Sinha and S. Sirtl and M. Slunecka and S. Sosio and F. Sozzi and A. Srnka and L. Steiger and M. Stolarski and M. Sulc and R. Sulej and H. Suzuki and A. Szabelski and T. Szameitat and P. Sznajder and S. Takekawa and J. ter Wolbeek and S. Tessaro and F. Tessarotto and F. Thibaud and S. Uhl and I. Uman and M. Virius and L. Wang and T. Weisrock and M. Wilfert and R. Windmolders and H. Wollny and K. Zaremba and M. Zavertyaev and E. Zemlyanichkina and M. Ziembicki and A. Zink},
journal= {arXiv preprint arXiv:1405.6377},
year = {2015}
}
备注
Published version: 9 pages, 3 figures, 1 table