2026-04-17T11:33:08Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/1406422025-12-05T16:48:48Zcom_2072_1057col_2072_478823col_2072_478917

urn:hdl:2445/140642 Improved Measurements of CP-Violating Asymmetry Amplitudes in B0→π+π− Decays Graugés Pous, Eugeni BABAR Collaboration Física de partícules Experiments Particle physics Experiments We 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 ) . 2019-09-20T10:31:28Z 2019-09-20T10:31:28Z 2005-10-04 2019-09-20T10:31:28Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Reproducció del document publicat a: https://doi.org/10.1103/PhysRevLett.95.151803 Physical Review Letters, 2005, vol. 95, num. 15, p. 151803 https://doi.org/10.1103/PhysRevLett.95.151803 (c) American Physical Society, 2005 info:eu-repo/semantics/openAccess American Physical Society Articles publicats en revistes (Física Quàntica i Astrofísica)