横向光束偏振作为CLIC新物理学的另一种观点
Transverse Beam Polarization as an Alternate View into New Physics at CLIC
摘要：
在$e^+e^-$碰撞中，横向光束偏振可以成为研究标准模型（SM）之外新物理的粒子性质的有用工具。然而，不同于与纵向偏振相关联的测量的情况，在横向偏振的情况下用于探测该物理的方位角不对称的形成需要两个$e^\pm$光束同时偏振。本文讨论了进一步利用横向极化作为探测新的物理模型在高能量，$\sqrt s=3$ TeV版本的CLIC。特别是，我们显示（$i$）如何测量这些不对称性的符号是足以区分生产的自旋0超对称状态的自旋1/2卡鲁扎-克莱因激发的普遍额外的维度。同时，由潜在的大SM $W^+W^-$背景引起的对这种不对称性的贡献可以小到可以忽略。然后，我们显示（$ii$）如何测量这种不对称性和它们相关的角分布的峰值上的一个新的共振$Z'$样的状态可以用来提取精确的信息的$Z'$耦合到SM费米子。
英文摘要：
In $e^+e^-$ collisions, transverse beam polarization can be a useful tool in studying the properties of particles associated with new physics beyond the Standard Model(SM). However, unlike in the case of measurements associated with longitudinal polarization, the formation of azimuthal asymmetries used to probe this physics in the case of transverse polarization requires both $e^\pm$ beams to be simultaneously polarized. In this paper we discuss the further use of transverse polarization as a probe of new physics models at a high energy, $\sqrt s=3$ TeV version of CLIC. In particular, we show ($i$) how measurements of the sign of these asymmetries is sufficient to discriminate the production of spin-0 supersymmetric states from the spin-1/2 Kaluza-Klein excitations of Universal Extra Dimensions. Simultaneously, the contribution to this asymmetry arising from the potentially large SM $W^+W^-$ background can be made negligibly small. We then show ($ii$) how measurements of such asymmetries and their associated angular distributions on the peak of a new resonant $Z'$-like state can be used to extract precision information on the $Z'$ couplings to the SM fermions.
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