Radiative Events as a Probe of Dark Forces at GeV-Scale e+ e- Colliders

Abstract

High-luminosity e+ e- colliders at the GeV scale (flavor factories) have been recently recognized to be an ideal environment to search for a light weakly coupled vector boson U (dark photon) emerging in several new physics models able to interpret anomalous astrophysical observations in terms of dark matter. At flavor factories a particularly clean channel is the production of the U boson in association with a photon, followed by the decay of the U boson into lepton pairs. Beyond the approximations addressed in previous works, we revisit the reach potential of this channel by performing an exact lowest-order calculation of the signal and background processes. We also include the effect of initial and final state QED corrections neglected so far, to show how they affect the distributions of experimental interest. We present new results for the expected statistical significance to a dark photon signal at KLOE/KLOE-2 and future super-B factories. The calculation is implemented in a new release of the event generator BabaYaga@NLO, which is available for full event simulations and data analysis.

8 pages, 9 figures. New numerical results and references added. Revised version accepted for publication in EPJ C

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Cited by in corpus (9)

• New Exclusion Limits on Dark Gauge Forces from Proton Bremsstrahlung in Beam-Dump Data
• Limit on the production of a low-mass vector boson in ${\mathrm{e}}^{+}{\mathrm{e}}^{-}\to \mathrm{U}\gamma$, $\mathrm{U}\to {\mathrm{e}}^{+}{\mathrm{e}}^{-}$ with the KLOE experiment
• Search for light vector boson production in $e^{+}{e}^{-}\to {\mu }^{+}{\mu }^{-}\gamma$ interactions with the KLOE experiment
• Limit on the production of a new vector boson in ${\mathrm{e}}^{+}{\mathrm{e}}^{-}\to \mathrm{U}\gamma$, U$\to {\pi }^{+}{\pi }^{-}$ with the KLOE experiment
• Combined limit on the production of a light gauge boson decaying into ${\mu }^{+}{\mu }^{-}$ and ${\pi }^{+}{\pi }^{-}$
• Low-Energy Signals from Kinetic Mixing with a Warped Abelian Hidden Sector
• Radiative corrections and Monte Carlo tools for low-energy hadronic cross sections in $e^{+}{e}^{-}$ collisions
• Search for invisible dark photon in $\gamma e$ scattering at future lepton colliders
• DAFNE and KLOE-2