Direct searches for low-mass new physics particles at BABAR

24 Aug 2015, 17:00
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Bertrand Echenard (Caltech)


We present results from the BaBar experiment on searches for low-mass new physics. This includes a search for a light CP-odd Higgs boson (A0) in Upsilon(1S) -> gamma A0, A0 -> ccbar decays. providing limits on the product branching fraction B(Upsilon(1S) -> gamma A0)xB(A0 -> ccbar) at the level of  7x10-5 - 2x10-3 for A0 masses between 4.0 GeV and 9.25 GeV; a search for a dark photon (A'), a new light gauge boson introduced by dark sector models obtaining 90% confidence level upper limits on the mixing strength between the photon and dark photon at the level of 10-3 - 10-4 for dark photon masses in the range 0.02 - 10.2 GeV; and a search for neutral, long-lived particles produced in e+e- collisions or neutral B meson decays obtaining limits on the product of the production cross-section, branching fraction, and reconstruction efficiency are set for each final state.

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