Search for a muonic dark force at BABAR

Abstract : 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- -> mu+mu- Z', Z' -> mu+mu- 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 7x10^-4 are derived, leading to improvements in the bounds compared to those previously derived from neutrino experiments.
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Contributor : Claudine Bombar <>
Submitted on : Tuesday, June 14, 2016 - 9:42:20 AM
Last modification on : Thursday, January 11, 2018 - 6:14:22 AM

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J.-P. Lees, V. Poireau, V. Tisserand, N. Arnaud, M. Davier, et al.. Search for a muonic dark force at BABAR. Physical Review D, American Physical Society, 2016, 94, pp.011102. ⟨10.1103/PhysRevD.94.011102⟩. ⟨in2p3-01331571⟩



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