Measurement of angular asymmetries in the decays B→K*ℓ⁺ℓ⁻

  • Roger Barlow (Creator)
  • George Lafferty (Creator)
  • The BaBar collaboration (Creator)



    SLAC-PEP2. We study the lepton forward-backward asymmetry $A_{FB}$ and the longitudinal $K^*$ polarization $F_L$, as well as an observable $P_2$ derived from them, in the rare decays $B \to K^*\ell^+\ell^-$, where $\ell^+\ell^-$ is either $e^+e^-$ or $\mu^+\mu^-$, using the full sample of 471 million $B\bar{B}$ events collected at the $\Upsilon(4S)$ resonance with the $BABAR$ detector at the PEP-II $e^+e^-$ collider. We separately fit and report results for the $K^{*0}(892)\ell^+\ell^-$ and $K^{*+}(892)\ell^+\ell^-$ final states, as well as their combination $K^{*}\ell^+\ell^-$, in five disjoint dilepton mass-squared bins. An angular analysis of $B^+\rightarrow K^{*+}\ell^+\ell^-$ decays is presented here for the first time.
    Date made available2016

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