Graugés Pous, EugeniBABAR Collaboration2019-09-202019-09-202005-10-040031-9007https://hdl.handle.net/2445/140642We present updated measurements of the C P -violating parameters S π π and C π π in B 0 → π + π − decays. Using a sample of 227 × 10 6 Υ ( 4 S ) → B ¯¯¯ B decays collected with the BABAR detector at the PEP-II asymmetric-energy e + e − collider at SLAC, we observe 467 ± 33 signal decays and measure S π π = − 0.30 ± 0.17 ( stat ) ± 0.03 ( syst ) and C π π = − 0.09 ± 0.15 ( stat ) ± 0.04 ( syst ) .7 p.application/pdfeng(c) American Physical Society, 2005Física de partículesExperimentsParticle physicsExperimentsinfo:eu-repo/semantics/article5390892019-09-20info:eu-repo/semantics/openAccess