Searching for an invisible A vector boson with DarkLight

Yonatan Kahn, Jesse Thaler

Research output: Contribution to journalArticlepeer-review


High-luminosity experiments are able to search for new physics at low energies, which could have evaded detection thus far due to very weak couplings to the Standard Model. The DarkLight experiment at Jefferson Lab is designed to search for a new U(1) vector boson A in the mass range 10-100MeV through its decay A→e+e-. In this paper, we demonstrate that DarkLight is also sensitive to an A decaying to invisible final states. We analyze the DarkLight reach for invisible A bosons assuming a nominal two month running time, including the possibility of augmenting the DarkLight design to include photon detection. We also propose two new analysis techniques that might prove useful for other high-luminosity searches: a cut on missing energy to improve the invariant mass resolution, and a cut on the sign of the missing invariant mass-squared to mitigate pileup. We compare the DarkLight reach to existing experimental proposals, including a complementary search using the VEPP-3 positron beam.

Original languageEnglish (US)
Article number115012
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number11
StatePublished - Dec 4 2012
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)


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