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oai:recercat.cat:2445/1194102025-12-05T16:42:17Zcom_2072_1057col_2072_478823col_2072_478904col_2072_478917

Search for a muonic dark force at BaBar Graugés Pous, Eugeni BABAR Collaboration Partícules (Matèria) Matèria fosca (Astronomia) Particles Dark matter (Astronomy) Many models of physics beyond the standard model predict the existence of new Abelian forces with new gauge bosons mediating interactions between "dark sectors" and the standard model. We report a search for a dark boson Z ′ coupling only to the second and third generations of leptons in the reaction e + e − → μ + μ − Z ′ , Z ′ → μ + μ − using 514     fb − 1 of data collected by the BABAR experiment. No significant signal is observed for Z ′ masses in the range 0.212-10 GeV. Limits on the coupling parameter g ′ as low as 7 × 10 − 4 are derived, leading to improvements in the bounds compared to those previously derived from neutrino experiments. 2018-01-30T12:14:28Z 2018-01-30T12:14:28Z 2016-07-19 2018-01-30T12:14:28Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Reproducció del document publicat a: https://doi.org/10.1103/PhysRevD.94.011102 Physical Review D, 2016, vol. 94, num. 1, p. 11102-1-11102-7 https://doi.org/10.1103/PhysRevD.94.011102 (c) American Physical Society, 2016 info:eu-repo/semantics/openAccess American Physical Society Articles publicats en revistes (Física Quàntica i Astrofísica)