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arXiv 0801.1762hep-ph
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Z玻色子衰变为光子和非粒子

Decay of Z Boson into Photon and Unparticle

Kingman Cheung, Thomas W. Kephart, Wai-Yee Keung, Tzu-Chiang Yuan

摘要:

研究了标准模型Z玻色子通过单圈衰变到非粒子加单光子的过程。在反常型衰变中,只有Z耦合的轴矢量部分与矢量非粒子匹配和/或Z耦合的矢量部分与轴矢量非粒子匹配才能对衰变产生非零贡献。我们表明,光子谱终止在符合杨的定理的终点。LEP I单光子产生的现有数据用于约束非粒子扇区。

英文摘要:

We study the decay of the standard model Z boson into unparticle plus a single photon through a one-loop process. As in the anomaly type decay, only the axial-vector part of the Z coupling matching with the vector unparticle and/or the vector part of the Z coupling matching with the axial-vector unparticle can give a nonzero contribution to the decay. We show that the photon spectrum terminates at the end point in accord with Yang's theorem. Existing data on single photon production at LEP I is used to constrain the unparticle sector.

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