Recent results on search for new physics at BaBar

Laboratori Nazionali di Frascati dell’INFN, Frascati, Italy

^a e-mail: benjamin.oberhof@lnf.infn.it

Published online: 12 April 2017

Abstract

We present some recent measurements for the search of New Physics using 514 fb⁻¹ of e⁺e⁻ collisions collected with the BaBar detector at the PEP-II e⁺e⁻ collider at SLAC. First we present a search for the decay ϒ (1S) → γA⁰, A⁰ → cc̄, where A⁰ is a candidate for the CP-odd Higgs boson of the next-to-minimal supersymmetric standard model. No significant signal is observed and we set 90% confidence-level upper limits on B(ϒ(1S ) → γA⁰) × B(A⁰ → cc̄). We report the search for a light non-Standard Model gauge boson Z′ coupling only to the second and third lepton families. Our results significantly improve current limits and further constrain the remaining region of the allowed parameter space. Finally, we present a search for a long-lived particle L that is produced in e⁺e⁻ annihilations and decays into two oppositely charged tracks. We do not observe a significant signal and we and set 90% confidence level upper limits on the product of the L production cross section, branching fraction, and reconstruction efficiency as a function of the L mass. In addition, upper limits are provided on the branching fraction B(B → X_sL), where X_s is an hadronic system with strangeness -1.