4.7 Article

Angular distributions in the decay B → K*l+l-

期刊

PHYSICAL REVIEW D
卷 79, 期 3, 页码 -

出版社

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.79.031102

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资金

  1. DOE and NSF (USA)
  2. NSERC (Canada)
  3. CEA and CNRS-IN2P3 (France)
  4. BMBF and DFG (Germany)
  5. INFN (Italy)
  6. FOM (The Netherlands)
  7. NFR (Norway)
  8. MES (Russia)
  9. MEC (Spain)
  10. STFC (United Kingdom)
  11. Marie Curie EIF (European Union)
  12. A. P. Sloan Foundation
  13. Science and Technology Facilities Council [ST/H001166/1, ST/H000887/1, ST/F008015/1, PP/E000444/1, ST/H000992/1] Funding Source: researchfish
  14. STFC [ST/F008015/1, ST/H000992/1, ST/H001166/1, ST/H000887/1] Funding Source: UKRI

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We use a sample of 384 X 10(6) B (B) over bar 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(ee) < 2.5 GeV/c(2), we measure a lepton forward-backward asymmetry A(FB) = 0.24(-0.23)(+0.18) +/- 0.05 and K* longitudinal polarization F-L = 0.35 +/- 0.16 +/- 0.04. For m(ee) > 3.2 GeV/c(2), we measure A(FB) = 0.76(-0.32)(+0.52) +/- 0.07 F-L = 0.71(-0.22)(+0.20) +/- 0.04.

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