Unparticle physics at the photon collider
Unparticle physics at the photon collider
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DOI：
10.1103/physrevd.77.094012
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发表时间：
2007-12
影响因子：
5
通讯作者：
T. Kikuchi;N. Okada;M. Takeuchi
中科院分区：
文献类型：
--
作者：
T. Kikuchi;N. Okada;M. Takeuchi
最近，一个概念上的新物理超越了标准模型（SM），非粒子，已被提出，其中一个隐藏的共形扇区耦合到SM扇区通过高维运营商。在这个设置中，我们研究了光子对撞机上的非粒子物理，特别是非粒子对$\ensuremath{\gamma}\ensuremath{\gamma}\ensuremath{\rightarrow}\ensuremath {\gamma}\ensuremath{\gamma}$过程的影响。由于这一过程发生在SM中的循环水平，即使截止尺度非常高，非粒子效应也可能是显著的。事实上，我们发现非粒子效应导致了与SM结果相当大的偏差。非粒子${d}_{\mathcal{U}}$的标度维数反映了截面对末态光子不变质量的依赖性，因此对这种依赖性的精确测量可以揭示非粒子的标度维数。
Recently, a conceptually new physics beyond the standard model (SM), unparticle, has been proposed, where a hidden conformal sector is coupled to the SM sector through higher dimensional operators. In this setup, we investigate unparticle physics at the photon collider, in particular, unparticle effects on the $\ensuremath{\gamma}\ensuremath{\gamma}\ensuremath{\rightarrow}\ensuremath{\gamma}\ensuremath{\gamma}$ process. Since this process occurs at loop level in the SM, the unparticle effects can be significant even if the cutoff scale is very high. In fact, we find that the unparticle effects cause sizable deviations from the SM results. The scaling dimension of the unparticle ${d}_{\mathcal{U}}$ reflects the dependence of the cross section on the final state photon invariant mass, so that precision measurements of this dependence may reveal the scaling dimension of the unparticle.