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

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...

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Detalles Bibliográficos
Autores principales: Andreev, Yu. M., Banerjee, D., Bernhard, J., Burtsev, V.E., Chumakov, A.G., Cooke, D., Crivelli, P., Depero, E., Dermenev, A.V., Donskov, S.V., Dusaev, R.R., Enik, T., Charitonidis, N., Feshchenko, A., Frolov, V.N., Gardikiotis, A., Gerassimov, S.G., Gninenko, S.N., Hösgen, M., Kachanov, V.A., Karneyeu, A.E., Kekelidze, G., Ketzer, B., Kirpichnikov, D.V., Kirsanov, M.M., Kolosov, V.N., Konorov, I.V., Kovalenko, S.G., Kramarenko, V.A., Kravchuk, L.V., Krasnikov, N.V., Kuleshov, S.V., Lyubovitskij, V.E., Lysan, V., Matveev, V.A., Mikhailov, Yu. V., Molina Bueno, L., Peshekhonov, D.V., Polyakov, V.A., Radics, B., Rojas, R., Rubbia, A., Samoylenko, V.D., Sieber, H., Shchukin, D., Tikhomirov, V.O., Tlisova, I., Toropin, A.N., Trifonov, A.Yu., Vasilishin, B.I., Volkov, P.V., Volkov, V. Yu.
Lenguaje:eng
Publicado: 2021
Materias:
hep-ph
Particle Physics - Phenomenology
hep-ex
Particle Physics - Experiment
Acceso en línea:https://dx.doi.org/10.1103/PhysRevLett.126.211802
http://cds.cern.ch/record/2751239
Descripción
Sumario: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.

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