Constraints on New Physics in Electron g-2 from a Search for Invisible Decays of a Scalar, Pseudoscalar, Vector, and Axial Vector

(NA64 Collaboration)

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1 Citation (Scopus)

Abstract

We performed a search for a new generic X boson, which could be a scalar (S), pseudoscalar (P), vector (V), or an axial vector (A) particle produced in the 100 GeV electron scattering off nuclei, e-Z→e-ZX, followed by its invisible decay in the NA64 experiment at CERN. No evidence for such a process was found in the full NA64 dataset of 2.84×1011 electrons on target. We place new bounds on the S, P, V, A coupling strengths to electrons, and set constraints on their contributions to the electron anomalous magnetic moment ae, |ΔaX|?10-15-10-13 for the X mass region 1 MeV?mX?1 GeV. These results are an order of magnitude more sensitive compared to the current accuracy on ae from the electron g-2 experiments and recent high-precision determination of the fine structure constant.

Original languageEnglish
Article number211802
JournalPhysical Review Letters
Volume126
Issue number21
DOIs
Publication statusPublished - 25 May 2021

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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