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arxiv: 2102.01885 · v1 · pith:VGTESO7Pnew · submitted 2021-02-03 · ✦ hep-ex · hep-ph

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

Yu.M. Andreev , D. Banerjee , J. Bernhard , V.E. Burtsev , A.G. Chumakov , D. Cooke , P. Crivelli , E. Depero
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A.V. Dermenev S.V. Donskov R.R. Dusaev T. Enik N. Charitonidis A.Feshchenko V.N. Frolov A.Gardikiotis S.G. Gerassimov S.N. Gninenko M. Hosgen V.A. Kachanov A.E. Karneyeu G. Kekelidze B. Ketzer D.V.Kirpichnikov M.M. Kirsanov V.N. Kolosov I.V. Konorov S.G. Kovalenko V.A. Kramarenko L.V. Kravchuk N.V. Krasnikov S.V. Kuleshov V.E. Lyubovitskij V.Lysan V.A. Matveev Yu.V. Mikhailov L. Molina Bueno D.V. Peshekhonov V.A. Polyakov B. Radics R. Rojas A. Rubbia V.D. Samoylenko H. Sieber D. Shchukin V.O.Tikhomirov I. Tlisova A.N. Toropin A.Yu. Trifonov B.I. Vasilishin P.V. Volkov V.Yu. Volkov
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classification ✦ hep-ex hep-ph
keywords electronvectoraxialconstraintselectronsinvisiblelesssimna64
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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, $e^- Z \to e^- Z X$, followed by its invisible decay in the NA64 experiment at CERN. No evidence for such process was found in the full NA64 data set of $2.84\times 10^{11}$ 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 $a_e$, $|\Delta a_{X}| \lesssim 10^{-15} - 10^{-13}$ for the $X$ mass region $m_X\lesssim 1$ GeV. These results are an order of magnitude more sensitive compared to the current accuracy on $a_e$ from the electron $g-2$ experiments and recent high-precision determination of the fine structure constant.

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