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Search for Long-Lived Particles in $e^+e^-$ Collisions
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abstract
We present a search for a neutral, long-lived particle $L$ that is produced in $e^+e^-$ collisions and decays at a significant distance from the $e^+e^-$ interaction point into various flavor combinations of two oppositely charged tracks. The analysis uses an $e^+e^-$ data sample with a luminosity of $489.1 \rm{fb}^{-1}$ collected by the BaBar detector at the $\Upsilon$(4S), $\Upsilon$(3S), and $\Upsilon$(2S) resonances and just below the $\Upsilon$(4S). Fitting the two-track mass distribution in search of a signal peak, we do not observe a significant signal, and set 90% confidence level upper limits on the product of the $L$ production cross section, branching fraction, and reconstruction efficiency for six possible two-body $L$ decay modes as a function of the $L$ mass. The efficiency is given for each final state as a function of the mass, lifetime, and transverse momentum of the candidate, allowing application of the upper limits to any production model. In addition, upper limits are provided on the branching fraction $Br(B\to X_s L)$, where $X_s$ is a strange hadronic system.
Forward citations
Cited by 4 Pith papers
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Long-Lived Dark Hadrons at the Electron-Ion Collider
A benchmark dark-QCD model with long-lived dark pions mixing into an axion-like state could let the EIC probe electron-portal couplings and dark pion masses beyond the reach of B-factories.
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Estimating the track-reconstruction efficiency in phenomenological proposals of long-lived-particle searches
TrackEff estimates Belle II track-reconstruction efficiency by geometrically counting drift-chamber hits, with default thresholds tuned to a Belle II tau-tau tracking efficiency measurement.
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Searching for a Sterile Neutrino in Tau Decays at B-factories
A displaced-vertex search in tau decays at BaBar, Belle, and Belle II could set limits on tau-mixing sterile neutrinos below the current DELPHI bound.
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Search for light long-lived neutral particles produced in $pp$ collisions at $\sqrt{s} =$ 13 TeV and decaying into collimated leptons or light hadrons with the ATLAS detector
No evidence for displaced dark-photon jets is found, and 95% confidence limits exclude cross sections above about 4 pb for H to two dark photons with decay lengths from 1.5 mm to 307 mm.
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