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The journal of high energy physics, 2021-06, Vol.2021 (6), p.1-36, Article 39
Ort / Verlag
Berlin/Heidelberg: Springer Berlin Heidelberg
Erscheinungsjahr
2021
Quelle
EZB Free E-Journals
Beschreibungen/Notizen
A
bstract
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.