An experiment of X-ray photon-photon elastic scattering with a Laue-case beam collider
An experiment of X-ray photon-photon elastic scattering with a Laue-case beam collider
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劳厄箱光束对撞机X射线光子-光子弹性散射实验
DOI：
10.1016/j.physletb.2016.11.003
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发表时间：
2016
影响因子：
4.4
通讯作者：
T. Ishikawa
中科院分区：
文献类型：
--
作者：
T. Yamaji;T. Inada;T. Yamazaki;T. Namba;S. Asai;T. Kobayashi;K. Tamasaku;Y. Tanaka;Y. Inubushi;K. Sawada;M. Yabashi;T. Ishikawa
本文报道了在能量为ω cms= 6.5 keV的质心系中，在X射线区域，在真空中寻找光子-光子弹性散射，其QED截面为σ QED= 2.5× 10− 47 m2.由SACLA X射线自由电子激光器提供的X射线束被分裂，并使两束子束以直角碰撞，总积分光度为（1.24±0.08）× 1028 m− 2。没有检测到来自弹性散射的满足能量和散射角之间的相关性的信号X射线。在ω cms= 6.5 keV时，散射截面为1.9× 10− 27 m2，CL上限为95%。上限是迄今为止通过keV实验获得的最低上限。
We report a search for photon–photon elastic scattering in vacuum in the X-ray region at an energy in the center of mass system of ω cms= 6.5 keV for which the QED cross section is σ QED= 2.5× 10− 47 m 2. An X-ray beam provided by the SACLA X-ray Free Electron Laser is split and the two beamlets are made to collide at right angle, with a total integrated luminosity of (1.24±0.08)× 10 28 m− 2. No signal X rays from the elastic scattering that satisfy the correlation between energy and scattering angle were detected. We obtain a 95% CL upper limit for the scattering cross section of 1.9× 10− 27 m 2 at ω cms= 6.5 keV. The upper limit is the lowest upper limit obtained so far by keV experiments.