Graugés Pous, EugeniBABAR Collaboration2018-01-262018-01-262016-11-151550-7998https://hdl.handle.net/2445/119345Using a sample of ( 470.9 ± 2.8 ) × 1 0 6     B ¯ B pairs, we measure the decay branching fraction B ( B 0 → D * − π + π − π + ) = ( 7.26 ± 0.11 ± 0.31 ) × 10 − 3 , where the first uncertainty is statistical and the second is systematic. Our measurement will be helpful in studies of lepton universality by measuring B ( B 0 → D * − τ + ν τ ) using τ + → π + π − π + ¯ ν τ decays, normalized to B ( B 0 → D * − π + π − π + ) .1 p.application/pdfeng(c) American Physical Society, 2016Partícules (Matèria)Leptons (Física nuclear)ParticlesLeptons (Nuclear physics)info:eu-repo/semantics/article6697742018-01-26info:eu-repo/semantics/openAccess