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Angular Distributions in the Decays B -> K* l+l-

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arxiv 0804.4412 v2 pith:I3THTPLD submitted 2008-04-28 hep-ex

The BABAR Collaboration: B. Aubert , et al This is my paper · ORCID
classification hep-ex
keywords angulardecaysdistributionsmeasureasymmetrybabarbbbarcollected
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abstract

We use a sample of 384 million BBbar 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 mu+mu-. For low dilepton invariant masses, m(l+l-)<2.5 GeV/c^2, we measure a lepton forward-backward asymmetry AFB=0.24 (+0.18,-0.23) +/- 0.05 and K* longitudinal polarization FL=0.35 +/- 0.16 +/- 0.04$. For m(l+l-)>3.2$ GeV/c^2, we measure AFB=0.76 (+0.52,-0.32) +/- 0.07 FL=0.71 (+0.20,-0.22) +/- 0.04.

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Cited by 2 Pith papers

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