国际直线对撞机束流传输系统中的自旋输运和偏振测量
Spin Transport and Polarimetry in the Beam Delivery System of the International Linear Collider
摘要：
极化电子束和正电子束是未来直线对撞机物理计划的关键成分。由于标准模型中弱相互作用的手征性质--以及可能超出标准模型的手征性质--在$e^+e^-$相互作用点处的亮度加权平均光束偏振的知识与亮度的知识具有类似的重要性，并且必须被控制到千分之一级的精度，以便充分利用物理潜力。目前的概念，以达到这一具有挑战性的目标相结合的测量，从激光康普顿旋光仪之前和之后的相互作用点与测量在相互作用点。这项工作的一个关键因素是了解旋光仪和相互作用点之间的自旋输运效应以及碰撞效应。我们表明，没有碰撞，偏振计可以交叉校准到0.1%，我们详细讨论了碰撞效应和光束参数的偏振值的相关解释的$e^+e^-$碰撞数据的影响。
英文摘要：
Polarised electron and positron beams are key ingredients to the physics programme of future linear colliders. Due to the chiral nature of weak interactions in the Standard Model - and possibly beyond - the knowledge of the luminosity-weighted average beam polarisation at the $e^+e^-$ interaction point is of similar importance as the knowledge of the luminosity and has to be controlled to permille-level precision in order to fully exploit the physics potential. The current concept to reach this challenging goal combines measurements from Laser-Compton polarimeters before and after the interaction point with measurements at the interaction point. A key element for this enterprise is the understanding of spin-transport effects between the polarimeters and the interaction point as well as collision effects. We show that without collisions, the polarimeters can be cross-calibrated to 0.1 %, and we discuss in detail the impact of collision effects and beam parameters on the polarisation value relevant for the interpretation of the $e^+e^-$ collision data.
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