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Searching for Z' bosons at the P2 experiment

MPS-Authors
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Dev,  Bhupal
Werner Rodejohann - ERC Starting Grant, Junior Research Groups, MPI for Nuclear Physics, Max Planck Society;

Rodejohann,  Werner
Werner Rodejohann - ERC Starting Grant, Junior Research Groups, MPI for Nuclear Physics, Max Planck Society;

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Citation

Dev, B., Rodejohann, W., Xu, X.-J., & Zhang, Y. (2021). Searching for Z' bosons at the P2 experiment. Journal of high energy physics: JHEP, 2021(06): 039. doi:10.1007/JHEP06(2021)039.


Cite as: https://hdl.handle.net/21.11116/0000-0009-0336-7
Abstract
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.