We use a sample of 384×10^6 BB̅ events collected with the BABAR detector at the PEP-II e+e- collider to study angular distributions in the rare decays B→K*ℓ+ℓ-, where ℓ+ℓ- is either e+e- or μ+μ-. For low dilepton invariant masses, mℓℓ<2.5 GeV/c2, we measure a lepton forward-backward asymmetry AFB=0.24-0.23+0.18±0.05 and K* longitudinal polarization FL=0.35±0.16±0.04. For mℓℓ>3.2 GeV/c2, we measure AFB=0.76-0.32+0.52±0.07 and FL=0.71-0.22+0.20±0.04.
Angular distributions in the decay B→K*l+l-
SIMI, GABRIELE;GAZ A;MARGONI, MARTINO;SIMONETTO, FRANCO;STROILI, ROBERTO;VOCI, CESARE;
2009
Abstract
We use a sample of 384×10^6 BB̅ events collected with the BABAR detector at the PEP-II e+e- collider to study angular distributions in the rare decays B→K*ℓ+ℓ-, where ℓ+ℓ- is either e+e- or μ+μ-. For low dilepton invariant masses, mℓℓ<2.5 GeV/c2, we measure a lepton forward-backward asymmetry AFB=0.24-0.23+0.18±0.05 and K* longitudinal polarization FL=0.35±0.16±0.04. For mℓℓ>3.2 GeV/c2, we measure AFB=0.76-0.32+0.52±0.07 and FL=0.71-0.22+0.20±0.04.
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