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arXiv 2103.09067hep-phhep-ex
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在P2实验中寻找$Z'$玻色子

Searching for $Z'$ bosons at the P2 experiment

P. S. Bhupal Dev, Werner Rodejohann, Xun-Jie Xu, Yongchao Zhang

摘要:

P2实验旨在高精度测量纵向极化电子与弹性电子-质子和电子- $^{12}$ C散射的宇称破坏不对称性。本文讨论了P2对新物理的敏感性,这种新物理是由一个新的$U(1)'$规范对称性的额外中性规范玻色子$Z'$所介导的。如果$U(1)'$的电荷分配是手性的,即,在$U(1)'$下,左手和右手费米子具有不同的电荷,直接诱导额外的宇称破坏。另一方面,如果$U(1)'$具有非手性电荷分配,则可以通过质量或动力学$Z$ - $Z'$混合来诱导额外的宇称破坏。通过比较P2的敏感性,现有的限制,我们表明,在这两种情况下,P2发现潜力在很宽的范围内的$Z'$质量。特别是,对于手征模型,P2实验可以探测规范耦合在$10^{-5}$的顺序时,$Z'$玻色子是轻的,重$Z'$玻色子高达79(90)TeV的质子($^{12}$ C)模式。对于具有质量混合的非手征模型,P2实验对小于大约$10^{-4}$的质量混合角敏感,这取决于模型细节和规范耦合幅度。

英文摘要:

The P2 experiment aims at high-precision measurements of the parity-violating asymmetry in elastic electron-proton and electron-$^{12}$C scatterings with longitudinally polarized electrons. We discuss here the sensitivity of P2 to new physics mediated by an additional neutral gauge boson $Z'$ of a new $U(1)'$ gauge symmetry. If the charge assignment of the $U(1)'$ is chiral, i.e., left- and right-handed fermions have different charges under $U(1)'$, additional parity-violation is induced directly. On the other hand, if the $U(1)'$ has a non-chiral charge assignment, additional parity-violation can be induced via mass or kinetic $Z$-$Z'$ mixing. By comparing the P2 sensitivity to existing constraints, we show that in both cases P2 has discovery potential over a wide range of $Z'$ mass. In particular, for chiral models, the P2 experiment can probe gauge couplings at the order of $10^{-5}$ when the $Z'$ boson is light, and heavy $Z'$ bosons up to 79 (90) TeV in the proton ($^{12}$C) mode. For non-chiral models with mass mixing, the P2 experiment is sensitive to mass mixing angles smaller than roughly $10^{-4}$, depending on model details and gauge coupling magnitude.

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