PoS - Proceedings of Science
Volume 274 - XIII International Conference on Heavy Quarks and Leptons (HQL 2016) - Rare Decays
B- > K tau tau, B - >K pi pi gamma and B -> K* l l at BaBar
B. Oberhof* and  On behalf of the B A B AR collaboration
Full text: pdf
Published on: January 24, 2017
We present some recent measurements of rare flavor-changing neutral current B decays, using
data collected with the BABAR detector at the PEP-II e+e− collider at SLAC. First, we search for the rare process B+ → K+τ+τ− and we do not find evidence for a signal. The measured branching fraction is (1.31+0.66-0.61(stat.)+0.35-0.25(sys.)) × 10−3 with an upper limit, at the 90% confidence level, of B(B → K+τ+τ−) < 2.25 × 10−3. We then study the lepton forward-backward asymmetry AFB and the longitudinal K∗ polarization FL in the rare decays B → K∗l+l−, where l+l− is either e+e− or μ+μ−. We report results for both the K∗(892)0l+l− and K∗(892)+l+l− final states, as well as their combination K∗l+l−, in five disjoint dilepton mass-squared bins. Finally, we measure the time-dependent CP asymmetry in the radiative-penguin decay B0 → KS0π−π+γ. The Kππ resonant structure is extracted by an amplitude analysis of the mKππ and mKπ spectra in B+ → K+π−π+γ decays. We use these results to extract the mixing-induced CP parameters of the process B0 → KS0ρ0γ from the time-dependent analysis of B0 → KS0π+π−γ decays and obtain S = −0.18 ± 0.32(stat.)+0.06 (syst.).
DOI: https://doi.org/10.22323/1.274.0055
How to cite

Metadata are provided both in "article" format (very similar to INSPIRE) as this helps creating very compact bibliographies which can be beneficial to authors and readers, and in "proceeding" format which is more detailed and complete.

Open Access
Creative Commons LicenseCopyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.