2,576 research outputs found
Branching Fraction Measurements of the Color-Suppressed Decays Bˉ0→D(∗)0π0, D(∗)0η, D(∗)0ω, and D(∗)0η′ and Measurement of the Polarization in the Decay Bˉ0→D∗0ω.
No full textWe report updated branching fraction measurements of the color-suppressed decays B̅ 0→D0π0, D*0π0, D0η, D*0η, D0ω, D*0ω, D0η′, and D*0η′. We measure the branching fractions (×10-4): B(B̅ 0→D0π0)=2.69±0.09±0.13, B(B̅ 0→D*0π0)=3.05±0.14±0.28, B(B̅ 0→D0η)=2.53±0.09±0.11, B(B̅ 0→D*0η)=2.69±0.14±0.23, B(B̅ 0→D0ω)=2.57±0.11±0.14, B(B̅ 0→D*0ω)=4.55±0.24±0.39, B(B̅ 0→D0η′)=1.48±0.13±0.07, and B(B̅ 0→D*0η′)=1.49±0.22±0.15. We also present the first measurement of the longitudinal polarization fraction of the decay channel D*0ω, fL=(66.5±4.7±1.5)%. In the above, the first uncertainty is statistical and the second is systematic. The results are based on a sample of (454±5)×106 BB̅ pairs collected at the Υ(4S) resonance, with the BABAR detector at the PEP-II storage rings at SLAC. The measurements are the most precise determinations of these quantities from a single experiment. They are compared to theoretical predictions obtained by factorization, Soft Collinear Effective Theory (SCET) and perturbative QCD (pQCD). We find that the presence of final state interactions is favored and the measurements are in better agreement with SCET than with pQCD
Search for B+ ---> D+K0 and B+ ---> D+K*0 decays.
No full textWe report a search for the rare decays B+→D+K0 and B+→D+K*0 in an event sample of approximately 465×106 BB̅ pairs collected with the BABAR detector at the PEP-II asymmetric-energy e+e- collider at SLAC National Accelerator Laboratory. We find no significant evidence for either mode and we set 90% probability upper limits on the branching fractions of B(B+→D+K0)<2.9×10-6 and B(B+→D+K*0)<3.0×10-6
Observation of inclusive D*+- production in the decay of Upsilon(1S).
No full textWe present a study of the inclusive D*± production in the decay of Υ(1S) using (98.6±0.9)×106 Υ(2S) mesons collected with the BABAR detector at the Υ(2S) resonance. Using the decay chain Υ(2S)→π+π-Υ(1S), Υ(1S)→D*±X, where X is unobserved, we measure the branching fraction B[Υ(1S)→D*±X]=(2.52±0.13(stat)±0.15(syst))% and the D*± momentum distribution in the rest frame of the Υ(1S). We find evidence for an excess of D*± production over the expected rate from the virtual photon annihilation process Υ(1S)→γ*→cc̅ →D*±X
Exclusive Initial-State-Radiation Production of the D anti-D, D* anti-D*, and D* anti-D* Systems
No full textMeasurement of the branching ratios Gamma(D(s)*+ ---> D(s)+ pi0) / Gamma(D(s)*+ ---> D(s)+ gamma) and Gamma(D*0 ---> D0 pi0) / Gamma(D*0 ---> D0 gamma)
No full textStudy of B ---> D(*) D(*)(s(J)) Decays and Measurement of D-(s) and D(sJ)(2460)- Branching Fractions
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Observation of new resonances decaying to Dπ and D∗π in inclusive e+e− collisions near s√=10.58 GeV.
No full textWe present a study of the D+π-, D0π+, and D*+π- systems in inclusive e+e-→cc̅ interactions in a search for new excited D meson states. We use a data set, consisting of ∼454 fb-1, collected at center-of-mass energies near 10.58 GeV by the BABAR detector at the SLAC PEP-II asymmetric-energy collider. We observe, for the first time, candidates for the radial excitations of the D0, D*0, and D*+, as well as the L=2 excited states of the D0 and D+, where L is the orbital angular momentum of the quarks
Measurement of time-dependent CP asymmetries in B0 ---> D(*)+- pi-+ and B0 ---> D+- rho-+ decays
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