2003/06/18 by The DELPHI Collaboration, J. Abdallah, P. Abreu +183 · 3 citations
Physics and Astronomy · #Dark Matter and Cosmic Phenomena #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex
paper · pdf · doi:10.1140/epjc/s2004-01598-6
published as Eur.Phys.J.C33:213-232,2004 · 35 pages, 9 figures, Accepted by Eur. Phys. J. C
openalex publication_date 2003/06/18 · arxiv created 2004/01/16 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/15
Data from Z decays in DELPHI have been searched for anti-B0d -> D*+ l- anti-nul with the D*+ decaying to D0 pi+ and D0 -> K- pi+, K- pi+ pi+ pi- or K- pi+ (pi0). These events are used to measure the CKM matrix element |Vcb| and the form factor slope, rhoA12: FD*(1)|Vcb| = 0.0392 +/- 0.0018 +/- 0.0023; rhoA12 = 1.32 +/- 0.15 +/- 0.33 corresponding to a branching fraction: BR(anti-B0d -> D*+ l- anti-nul) = (5.90 +/- 0.22 +/- 0.50)%. Combining these and previous DELPHI measurements gives: FD*(1)|Vcb| = 0.0377 +/- 0.0011 +/- 0.0019, rhoA12 = 1.39 +/- 0.10 +/- 0.33 and BR(anti-B0d -> D*+ l- anti-nul) = (5.39 +/- 0.11 +/- 0.34)%. Using FD*(1) = 0.91 +/- 0.04, yields: |Vcb| = 0.0414 +/- 0.0012(stat.) +/- 0.0021(syst.) +/- 0.0018(theory). The b-quark semileptonic branching fraction into a D*+ emitted from higher mass charmed excited states has also been measured to be: BR(b -> D*+ X l- anti-nul) = (0.67 +/- 0.08 +/- 0.10)%.